Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Multi-Deck Rotary Switches
SERIES 53, 57 and 59
1.125" Diameter, 1/4 Amp
Features
• Smallest Diameter Rotary Switch
with this Number of Positions and
Current Capacity
• Military Qualified MIL-DTL-3786/36
• Gold-plated Contact System
Compatible with Logic Circuitry
DIMENSIONS in inches (and millimeters)
Military Style
Ser. 53—1.281 (32,54)
Ser. 57 & 59—
1.125 ± .010 (28,58 ± 0,25)
.437
±.020
(11,10
±0,51)
.437
±.020
(11,10
±0,51)
DIM. A
+ .046 (1,17)
– .020 (0,51)
DIM. B REF. STUD
PROJECTION
.250 ± .020
(6,35 ± 0,51)
1.000 (25.4) SER. 57 & 59
1.156 (29.36) SER. 53
± .010 (0,25)
CL
Rear views
shown with circuit
diagrams
45°
.219 ± .004 CL
(5.56 ± 0,10)
SEE
CIRCUIT
DIAGRAM
.250 + .001
–.002 DIA.
(6,35 + 0,03
–0,05)
CL OF BUSHING
KEYWAY
CL OF POSITION
NO. 1
MILITARY NUMBERS MARKED HERE
BUSHING KEYWAY
.066 ± .002 (1,68 ± 0,05) WIDE
BY .036 ± .003 (0,91 ± 0,08)
DEEP FROM A .375 (9,53) DIA.
INTEGRAL ASSEMBLY NUT. DO NOT REMOVE.
Rotary Switches
3/8-32 UNEF-2A THREAD
No. of
Decks
Dimension
A
Dimension
B
Approx.
Weight
Grams
1
2
3
4
5
6
.916 (23,27)
1.249 (31,72)
1.582 (40,18)
1.915 (48,64)
2.248 (57,10)
2.831 (71,91)
.032 (0,81)
.032 (0,81)
.032 (0,81)
.032 (0,81)
.032 (0,81)
.281 (7,14)
50
60
70
80
90
100
No. of Dimension
Decks
A
7
8
9
10
11
12
3.164 (80,37)
3.497 (88,82)
3.830 (97,28)
4.163 (105,74)
4.496 (114,20)
4.829 (122,66)
Dimension
B
Approx.
Weight
Grams
.281 (7,14)
.281 (7,14)
.281 (7,14)
.281 (7,14)
.281 (7,14)
.281 (7,14)
110
120
130
140
150
160
Non-Turn Washer Detail D
.375 ± .005
(9,53 ± 0,13)
.125
± .003
(3,18
± 0,08)
STyLE M—.187 (4,75)
STyLE HS—.125 (3,18)
± .010 (0,25)
Mounting Hardware: Two mounting nuts, .094" (2,39) thick by .562" (14,27) across flats, one internal tooth lockwasher
and one non-turn washer (see detail D for dimensions), are supplied with switch.
Grayhill part number and date code marked on detent cover label. Customer part number marked on request. Military
part number marked when required.
Standard Style
Military Qualified
The Series 53, 57 and 59 rotary switches are
all military type switches. Grayhill manufactures
these switches in two styles: M and HS. Style
M is unsealed and is not qualified; Style HS is
shaft and panel sealed and is qualified. The
non-qualified Style M can be regarded as our
Standard Style for types of switches. Although
it is not qualified, Style M is constructed of the
same military grade materials and will provide
comparable performance in all areas. For
example, the Style ‘M’ switches, in addition to
the electrical ratings listed elsewhere in these
pages, will meet the following requirements of
MIL-DTL-3786:
Moisture Resistance: Medium and High Shock;
Vibration (10 to 500 cps); Thermal Shock (-65
°C to 125 °C); Salt Spray; Explosion; Terminal
Strength (pull, 2 lbs. minimum); and Stop Strength
(15 pound-inches minimum).
.032 ± .003
(0,81 ± 0,08)
The line drawings shown above are applicable
to the Style M and Style HS. The only difference
between the two is the length of the tab of the
non-turn washer. The shorter tab for the HS is
explained in the following paragraph.
59 rotary switches does not extend to all
possible combinations listed in the Choices
and Limitations chart. The limitations on the
qualification are described in the chart shown
below.
The Series 53, 57 and 59 Style HS rotary switches
are qualified to MIL-DTL-3786/36. The Style HS
is shaft and panel sealed. The panel is sealed by
an O-ring at the base of the bushing. The shaft
is sealed by an O-ring inside the bushing. These
seals do not alter the dimensions shown in the
line drawings when the switch is mounted.
Standard variations, such as shaft and/or
bushing length, etc., that do not affect switch
performance can also be marked as qualified
product. For complete details contact Grayhill.
Military qualified Series 53, 57 and 59 Style HS
rotary switches may be ordered by the ‘M’ number
listed in MIL-DTL-3786/36 or by the Grayhill part
number. Military style switches will be marked
to the specification.
A non-turn washer, supplied with the mounting
hardware, may be used with the Style HS
switches. It is suggested that the non-turn washer
be mounted in the following manner to preserve
the seal: from the front of the panel into a hole
that does not go through the panel.
The qualification of the Series 53, 57 and
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
Style HS Switches are MIL-DTL-3786/36
Qualified for the Following Characteristics
Series
Max. No.
of Decks
53
57
59
5
5
5
Max. No.
Max. No.
Poles/Deck Total Poles/Switch
8
4
5
24
20
20
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Multi-Deck Rotary Switches
SPECIFICATIONS
Electrical Ratings
General
Materials and Finishes
Contact Resistance: 50 milliohms maximum
(20 milliohms initially).
Insulation Resistance: 1,000 megohms
minimum between mutually insulated parts.
Voltage Breakdown: 500 Vac minimum between
mutually insulated parts. These switches will
carry 4 amperes with a maximum contact
temperature rise of 20°C. If the life limiting
characteristics are less critical than those shown
above or if elevated temperatures or reduced
pressures are involved, Grayhill can predict the
switch life for the application.
CURRENT MILLIAMPS
Switch rating for break before make
contacts.
Voltage: As listed in the chart.
400
VOLTAGE 115 VAC
300
200
100
0
0
5
10
15
25
20
Electrical Ratings
Military Qualified
CURRENT MILLIAMPS
CyCLES x 1,000
The Series 53, 57 and 59 Style HS, Rotary
Switches have been tested to make and break
the following loads as stated in MIL-DTL-3786/36:
70,000 ft. altitude for 10,000 cycles: 10mA,
28 Vdc, inductive (250 mH); 50 mA, 28 Vdc,
resistive; 20 mA, 115 Vac, resistive. Atmospheric
pressure, 125°C for 10,000 cycles: 25 mA,
28 Vdc inductive (250 mH); 75 mA, 28 Vdc,
resistive; 50 mA, 115 Vac resistive. Atmospheric
pressure, 25°C for 10,000 cycles: 75 mA,
28 Vdc, inductive (250 mH); 250 mA, 28 Vdc
resistive; 150 mA, 115 Vac, resistive. Life limiting
criteria for these loads are:
Contact Resistance: 50 milliohms maximum.
Dielectric Strength: 500 Vac (350 Vac—reduced
pressure).
Insulation Resistance: 1,000 megohms
minimum. These switches also meet MIL-DTL3786/36 for moisture resistance, medium and
high shock, vibration, thermal, thermal shock,
salt spray, explosion, terminal strength and
stop strength.
400
300
30 VDC RESISTIVE
200
100
0
30 VDC
INDUCTIVE
0
5
10
15
25
20
CyCLES x 1,000
Additional Characteristics
Rotational Torque: 20-80 in-ozs., depending
on the number of poles per deck and the
number of decks.
Contacts: Shorting or non-shorting wiping
contacts with over 100 grams of contact
force.
Shaft Flat Orientation: Flat opposite
contacting position pole #1 (See Circuit
Diagrams).
Extended Studs: Switches of 6 decks or
more have longer studs with extra stud nuts for
recommended double end mounting.
Terminals: Switch is provided with full
complement of base or position terminals
regardless of the number of active positions.
CIRCuIt DIAGRAMS: Series 57
Switch is Viewed From Shaft End and Shown in Position No. 1.
Rear View
Note: All common terminals are located above base terminals as shown.
1 C1
C1
16
5
4
3
1
2
C1
12
SEE
DETAIL
TWO POLE
C5
9
10 11
C4 8
C6
12
13 C7
14
7
6
15
6
1 C
L
2
C3
C
L
THREE OR
FOUR POLE
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
15
16 C8
5
4
C2
3
2
11
10
9
1
C1
FIVE THRU
EIGHT POLE
C
L
5
C3
10 11
9
12
C4
8
13
14
7
3
6
C OF BUSHING
L
KEyWAy
C OF POSITION
L
NO. 1
4
7
ONE POLE
11-15°
13
2
8
221/2° Angle
of throw
3
15
4
15
16
5
16
16
5
1.190 ± .015
(30,23 ± 0,38)
OVER TERMINALS
14
15
6
C2
7
6
1
14
7
12 C2
13
14
8
2
13
10 11
3
8
9
12
4
10 11
LA GRANGE
ILLINOIS
9
GRAyHILL
Rotary Switches
Curve data based on test data conducted at
sea level, 25°C and relative humidity. Cycle
equals 360° rotation and 360° return. Cycling
rate is 10 cycles per minute. The curves shown
are typical load life curves for a Series 53M,
57M and 59M Rotary Switch. They show the
number of cycles of rotational life that can be
expected for the voltages, currents and types
of loads shown. Thus, with a 250 milliamperes,
30 Vdc resistive load, 10,000 cycles of life can
be expected. Life limiting or failure criteria for
these curves are:
Cover, Base, Spacer and Rotor Mounting
Plate: Diallyl per (MIL-M-14) ASTM-D-5948
Mounting Bushing: Brass, tin/zinc-plated.
Shaft, Stop Pins, Retaining Rings, Through
Bolts, Shaft Extension, Stop Arm, Thrust
Washers, Lockwashers, Nuts, Non-turn
Washer, Cover Plate and Rear Support
Plate: Stainless steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact: Silver alloy, gold-plated
.00001" minimum.
Terminals and Common Plate Including
Solder Lug: Brass, gold plate .00002"
minimum over silver plate .0003" minimum.
Panel Seal: Silicone rubber.
Shaft Seal: O-ring per MIL-M-5516B.
Mounting Nut, Lock Washer: Brass, tin/zincplated or stainless steel.
SEE NOTE
Note: Common location for a single pole per
deck switch. For common location on
multipole switches see circuit diagrams.
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Multi-Deck Rotary Switches
CIRCUIT DIAGRAMS: Series 57
Switch is Viewed From Shaft End and Shown in Position No. 1.
Rear View
Note: All common terminals are located above base terminals as shown.
9
12
16
5
4
C2
1
2
C1
3
12
SEE
DETAIL
TWO POLE
C5
9
10 11
C4 8
C6
12
13 C7
14
7
6
15
6
1 C
L
2
C3
C
L
15
16 C8
5
4
3
C2
THREE OR
FOUR POLE
2
11
10
9
1
C1
C
L
FIVE THRU
EIGHT POLE
5
C3
10 11
9
12
C4
8
13
14
7
3
6
C OF BUSHING
L
KEyWAy
C OF POSITION
L
NO. 1
4
13
C1
7
ONE POLE
11-15°
14
1 C1
8
221/2° Angle
of Throw
2
3
15
16
5
15
4
7
6
16
15
1
6
1.190 ± .015
(30,23 ± 0,38)
OVER TERMINALS
2
14
16
12 C2
13
14
3
7
5
10 11
8
4
13
LA GRANGE
ILLINOIS
10 11
GRAyHILL
9
8
SEE NOTE
Note: Common location for a single pole per
deck switch. For common location on
multipole switches see circuit diagrams.
SPECIFICATIONS
Electrical Ratings
General
Materials and Finishes
400
VOLTAGE 115 VAC
300
200
100
0
0
5
10
15
20
25
CyCLES x 1,000
CURRENT MILLIAMPS
Rotary Switches
CURRENT MILLIAMPS
Switch rating for break before make
contacts.
Voltage: As listed in the chart.
400
300
30 VDC RESISTIVE
200
100
0
30 VDC
INDUCTIVE
0
5
10
15
20
25
CyCLES x 1,000
Curve data based on test data conducted at
sea level, 25°C and relative humidity. Cycle
equals 360° rotation and 360° return. Cycling
rate is 10 cycles per minute. The curves shown
are typical load life curves for a Series 53M,
57M and 59M Rotary Switch. They show the
number of cycles of rotational life that can be
expected for the voltages, currents and types
of loads shown. Thus, with a 250 milliamperes,
30 Vdc resistive load, 10,000 cycles of life can
be expected. Life limiting or failure criteria for
these curves are:
Contact Resistance: 50 milliohms maximum
(20 milliohms initially).
Insulation Resistance: 1,000 megohms
minimum between mutually insulated parts.
Voltage Breakdown: 500 Vac minimum between
mutually insulated parts. These switches will
carry 4 amperes with a maximum contact
temperature rise of 20°C. If the life limiting
characteristics are less critical than those shown
above or if elevated temperatures or reduced
pressures are involved, Grayhill can predict the
switch life for the application.
Electrical Ratings
Military Qualified
The Series 53, 57 and 59 Style HS, Rotary
Switches have been tested to make and break
the following loads as stated in MIL-DTL-3786/36:
70,000 ft. altitude for 10,000 cycles: 10mA,
28 Vdc, inductive (250 mH); 50 mA, 28 Vdc,
resistive; 20 mA, 115 Vac, resistive. Atmospheric
pressure, 125°C for 10,000 cycles: 25 mA,
28 Vdc inductive (250 mH); 75 mA, 28 Vdc,
resistive; 50 mA, 115 Vac resistive. Atmospheric
pressure, 25°C for 10,000 cycles: 75 mA,
28 Vdc, inductive (250 mH); 250 mA, 28 Vdc
resistive; 150 mA, 115 Vac, resistive. Life limiting
criteria for these loads are:
Contact Resistance: 50 milliohms maximum.
Dielectric Strength: 500 Vac (350 Vac—reduced
pressure).
Insulation Resistance: 1,000 megohms
minimum. These switches also meet MIL-DTL3786/36 for moisture resistance, medium and
high shock, vibration, thermal, thermal shock,
salt spray, explosion, terminal strength and
stop strength.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
Cover, Base, Spacer and Rotor Mounting
Plate: Diallyl per (MIL-M-14) ASTM-D-5948
Mounting Bushing: Brass, tin/zinc-plated.
Shaft, Stop Pins, Retaining Rings, Through
Bolts, Shaft Extension, Stop Arm, Thrust
Washers, Lockwashers, Nuts, Non-turn
Washer, Cover Plate and Rear Support
Plate: Stainless steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact: Silver alloy, gold-plated
.00001" minimum.
Terminals and Common Plate Including
Solder Lug: Brass, gold plate .00002"
minimum over silver plate .0003" minimum.
Panel Seal: Silicone rubber.
Shaft Seal: O-ring per MIL-M-5516B.
Mounting Nut, Lock Washer: Brass, tin/zincplated or stainless steel.
Additional Characteristics
Rotational Torque: 20-80 in-ozs., depending
on the number of poles per deck and the
number of decks.
Contacts: Shorting or non-shorting wiping
contacts with over 100 grams of contact
force.
Shaft Flat Orientation: Flat opposite
contacting position pole #1 (See Circuit
Diagrams).
Extended Studs: Switches of 6 decks or
more have longer studs with extra stud nuts for
recommended double end mounting.
Terminals: Switch is provided with full
complement of base or position terminals
regardless of the number of active positions.
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Multi-Deck Rotary Switches
CIRCUIT DIAGRAMS: Series 53
Rear View
Switch is Viewed From Shaft End and Shown in Position No. 1
Note: All common terminals are located above base terminals as shown.
10 9 8
11
22 21 20
19
12
1.350 ± .015
C3
(34,29 ± 0,38)
C2
C2
15
15
16
16
15
14
14
1617
1718
1718
OVER TERMINALS
13
13
13 14
18
C4
12
12
19
19
12
19
11
11
20
20
11
20
C3
10
10
21
21
10
21
16 15 14
17
9
9
13
22
9
22
22
18
8
8
23
23
8
23
SEE
7
7
24
24
7
24
DETAIL
C2
6
6
6
5 4 3 2 1 C
5 4 3 2 1 C
5 4 3 2 1 C
C1
L
L
C1 L
C1
C
1
7 / 2˚
L OF BUSHING
KEYWAY
ONE POLE
TWO POLE
THREE POLE
FOUR POLE
C OF
L
POSITION
C9
C10
NO.
1
C4
C5
C6
17 18 19 20
C8
C11
1415 1617
SEE NOTE
14 151617 C5
16
21
13
18
18
13
15
22
C4 12
19 C7
12
7.5°
19
11
14
23
C3 11
20
20
C7
C12
Note: Common location for a single pole per
10
21
10
21
13
24
deck switch. For common location on
9
22
9
22
12
1
multipole switches see circuit diagrams.
23
CL OF POSITION #1
8
23 C6 C3 8
C6 11
C1
C8
2
7
7
24
24
10
3
6
6
5 4 3 2 1
5 4 3 2 1 C
9
4
C
37.5°
C2
C2
L
8 7 6 5
Terminal Detail
C5
L
C1
C2
C1
C4
C3
14 15 1617
13
18
12
19
11
20
10
21
9
22
8
23
24 45˚
7
6
5 4 3 2 1 C1
LA GRANGE
ILLINOIS
23
GRAyHILL
1
NINE THRU TWELVE POLE
3 2
SEVEN OR EIGHT POLE
4
FIVE OR SIX POLE
5
CL OF BUSHING
KEYWAY
.034 ± .003
(0,86 ± 0,08)
6
24
7
15° Angle
of Throw
.068 ± .005
(1,73 ± 0,13)
CIRCUIT DIAGRAMS: Series 59
Rear View
Switch is Viewed From Shaft End and Shown in Position No. 1
Note: All common terminals are located above base terminals as shown.
12 1
1
16
18 17
LA GRANGE
ILLINOIS
GRAyHILL
19
5
20
6
4
3
2
1
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
13
7
.375
:t.005
FOR ALL 53/57/59 SERIES
!NON-SEALED)
14
8
+ .005
DIA
· 375-.000
SEE
DETAIL
15
9
FIVE POLE
1.190 ± .015
(30,23 ± 0,38)
OVER TERMINALS
10
18° Angle
of Throw
12 13 14
11 12 13 14
11
15 C2
15
15
10
10
10
16
16
16
9
9
9
17
17
17
8
8
8
C2
18
18
18
7
7
7
C4
19
19
19
6
6
6
45
20
20
20
5
5
5
C1
4 3 2 1 C1
4 3 2 1
4 3 2 1
C
C
18 C OF BUSHING
L
L
C1
L
KEyWAy
ONE POLE
TWO POLE
THREE OR FOUR POLE
C OF POSITION
L
NO. 1
C7
C6
C4
11 12 13 14 C8
11 12 13 14
15
15
C3 10
C5 10
16
16
9
9
C5
8
8
17 C9
17
18
18
C4 7
7
19
6
6
19 C10
5
20
20
5
C2
C3
4 3 2 1
4 3 2 1
C
C1
C
C1
L
C2
L
SEE NOTE
Note: Common location for a single pole per
deck switch. For common location on
multipole switches see circuit diagrams.
SIX THRU TEN POLE
.135 DIA.
:t.003
.060
:t.002
FOR ALL 53/57/59 SERIES
(SEALED)
Recommended Panel Cutout
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
C3
11 12 13 14
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Multi-Deck Rotary Switches
Choices and limitations
Series
Style and
Designation
Angle of
Throw
Stops Terminals
M = Military Style
53
HS = Military Qualified,
Shaft/Panel Seal
HS = Military Qualified,
Shaft/Panel Seal
HS = Military Qualified,
Shaft/Panel Seal
Number of
Positions/Pole
01 thru 12
01 thru 12
01 thru 08
01 thru 06
01 thru 04
01 thru 03
01 or 02
01 thru 12
01 thru 12
01 thru 08
01 thru 06
01 thru 04
01 thru 03
01 or 02
1
2
3
4
5 or 6
7 or 8
9, 10, 11 or 12
02 thru 24
02 thru 12
02 thru 08
02 thru 06
02 thru 04
02 or 03
02
Fixed
Solder
Lug
221/2°
Fixed
Solder
Lug
01 thru 12
01 thru 12
01 thru 06
01 thru 03
01 thru 12
01 thru 12
01 thru 06
01 thru 03
1
2
3 or 4
5, 6, 7 or 8
02 thru 16
02 thru 08
02 thru 04
02
Solder
Lug
01 thru 12
01 thru 12
01 thru 06
01 thru 04
01 or 02
01 thru 12
01 thru 12
01 thru 06
01 thru 04
01 or 02
1
2
3 or 4
5
6, 7, 8, 9 or 10
02 thru 20
02 thru 10
02 thru 05
02 thru 04
02
M = Military Style
59
Poles
Per Deck
15°
M = Military Style
57
Number of Decks
Shorting
Non-Shorting
18°
Fixed
MIL Spec. provides for qualification up to and including five decks. Switches of longer length, although not specifically qualified, are built of the same
materials and are of the same construction.
ACCESSORIES
Internal Tooth Lockwasher–Figure A
Non-Turn Washer–Figure B
Can be ordered as extra hardware for the
Series 5000, 24, 42, 43, 44, 54, 71B, 53, 57 and
59 rotary switches. The internal key of the
washer slides into the bushing keyway. The
right angle tab locks into a predrilled hole on
the back side of the mounting panel. Material is
brass, tin/zinc plated. Part No. 12C1087-1
bushing to the panel. The kit consists of four
items: a grooved hex nut, a keyed washer, a
keyed seal and a non-turn washer. Assembly is
described on Page J-53. Dimensions of panel
seal kit items are shown in Figure C. This kit
seals the bushing to the panel; it does not seal
the shaft to the bushing. Not usable with
adjustable stop switches. Part No. 42-24
.625 ± .010
(15,88 ± 0,25) DIA.
.375 + .004 – .000
(9,53 + 0,10) DIA.
.375 ± .005
(9,53 ± 0,13)
C
L
Panel Seal Kit–Figure C
Sold as a separate item to seal the switch
.125 ± .003
(3,18 ± 0,08)
.060 ± .002
(1,52 ± 0,05)
.154
+ .004
–.000
(3,91
+ 0,10
–0,00)
DIA.
.625 ± .010
(15,88 ± 0,25)
DIA.
.376 + .003 –.000
(9,55 + 0,08 –0,00)
DIA.
.437 ± .010
(11,10 ± 0,25)
.032 ± .002
(0,81 ± 0,05)
.125 ± .010
(3,18 ± 0,25)
.120 ± .003
(3,18 ± 0,08)
FIGURE B
.032
± .002
(0,81
± 0,05)
.045 ± .003
(1,14 ± 0,08)
.562 (14,27)
ACROSS
FLATS
.010 ± .002
(0,25 ± 0,05)
.187 ± .010
(4,75 ± 0,25)
.088 (2,24)/
.093 (2,36)
Non-Turn Washer
er
Keyed Washer
FIGURE C
ORDERING INFORMAtION
Series
Style*: Letter(s) from the Choices and Limitations chart
Angle of Throw: Must agree with Series Number
Number of Decks: As limited by Choices and Limitations chart
57M22–01–1–16N–F
* All rotary switches that are
required to have military
designated markings and testing
adhering to MIL-DTL-3786 are to
be ordered by specifying the
military part number identified on
the appropriate slash sheet.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
Stop Arrangement: Use suffix only when ordering 1 pole with
maximum positions.
F = Stop between last and first positions; C = Continuous Rotation
Type of Contacts: N = Non-shorting; S = Shorting
Positions Per Pole: requires 02 as a minimum to the maximum allowable
dependent on the angle of throw and poles per deck
Poles Per Deck: As limited by angle of throw
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
For a 3/8" bushing. Approximately 0.500" (12,7)
outside diameter, .022" (0,56) thickness. Material
is cadmium-plated steel. Part No. 12Q1272-1
For a 1/4" bushing. Approximately
0.400" (10,16) outside diameter, .018"
(0,46) thickness. Material is steel, tin/
zinc plated.
FIGURE A
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Rotary Switch Engineering Information
Catalog Ratings
Are catalog ratings misleading? In most cases,
yes. Load and life ratings shown in most catalogs
are usually invalid for most applications. This
results from the complex interplay of such factors
as environment, duty cycle, life limiting or failure
criteria, actual load, etc. Circuit designers should
be aware of these factors, and the effect they have
on the useful life of the switch in their applications.
The problem of switch rating arises from the wide
variety of requirements placed on the switch. This
includes various applications, and the sensitivity
of the switch to a change in requirements. If we
attempted to establish life ratings for all possible
applications, we would have an almost infinite
variety of ratings.
To simplify the problem, switch manufacturers,
switch users, and the military, have established
certain references for ratings. These include
loads, life requirements, environments, duty
cycles, and failure criteria. These references
are arbitrarily established. But, they allow you to
compare different switch designs. They do not,
however, match the actual requirements for most
applications.
The curves shown here are an example of some
of the life load curves. These curves are life load
characteristics of the Grayhill 42M and 44M
switches. Note that the curves consider only two
voltage sources and two types of loads. These
voltages and loads are, however, considered as
standards for testing procedures by the industry.
Curve data is based on tests conducted at
sea level, 25°C and 68% relative humidity.
Cycle = 360° rotation and return. Cycling rate
is 10 cycles per minute. Switch rating is for
non-shorting contacts.
CURRENT (AMPS)
7
6
5
VOLTAGE 115 VAC
RESISTIVE
4
3
2
1
0
0
10
25
50
CYCLES x 1,000
CURRENT (AMPS)
1.7
1.5
VOLTAGE 30 VDC
RESISTIVE
1.2
1.0
.75
INDUCTIVE
(2.8 HENRIES)
.50
.20
0
0
10
25
50
CYCLES x 1,000
www.grayhill.com
These curves allow you to predict the expected life
of the switch once you know the voltage, current
and type of load. Also note that each cycle is
approximately a 360° rotation and a return. For a
ten position switch this would be a rotation from
position 1 to position 10 and back to 1. This cycle
runs approximately ten times a minute. Thus testing
causes more electrical and mechanical wear than
what the switch incurs in actual use.
Summary
The life and load ratings in this and other catalogs
are probably not totally valid for your application.
The bright side of the picture is that in most
applications the switch will perform better than its
ratings. This is because the standard industry test
conditions are more stringent than those found in
most applications.
This difference can be very dramatic. For example,
Grayhill’s 42A and 44A Series Rotary Switches, are
rated at 1 ampere (115 Vac resistive). However,
they will operate at 5 amperes in many applications.
To see how some major factors influence switch
performance, read on.
USEFUL LIFE CRITERIA
The “useful” life of a switch in your application
depends on what you demand of it. This includes
parameters such as contact resistance, insulation
resistance, torque, detent feel, dielectric strength,
and many other factors. For example, a contact
resistance of 50 milliohms may be totally unusable
in certain applications such as a range switch in a
micro-ohm meter. In other applications a contact
resistance of 5 ohms may be perfectly satisfactory.
In establishing “useful” life for a switch in your
application, you must first determine “failure
criteria,” or “end of life” parameters. At what level
of contact resistance, dielectric strength, etc., is the
switch no longer acceptable for your application?
Most switches are acceptable on all parameters
when new. There is a gradual deterioration in
performance with life. The rate of deterioration
varies greatly with basic switch design. Often,
circuit designers select a switch on the basis of
its performance when new. This is a mistake.
The performance of the switch after several
years of equipment use is more significant. To
estimate this, first determine the life limiting or
failure criteria for your application. In most uses,
important life-limiting (failure) criteria include the
following parameters:
Contact Resistance
Insulation Resistance
Dielectric Strength
Actuating Force
Contact Resistance
This is the resistance of a pair of closed contacts.
This resistance effectively appears in series with
the load. Typical values are in the range of a few
milliohms for new switches. These values usually
increase during life. The rate of increase is greatly
affected by the voltage, current, power factor,
frequency, and environment of the load being
switched. Typical industry standard “end of life”
criteria for this parameter are:
MIL-DTL-3786:
MIL-S-6807:
MIL-S-8805:
MIL-S-83504:
20 milliohms
(Rotary Switches)
20 milliohms
(Snap Pushbuttons)
40 milliohms
(Pushbuttons)
100 milliohms
(DIP Switches)
Contact resistance can be measured by a number
of different methods. All of them are valid depending
upon the switch application and the circuit.
Grayhill uses the method in applicable military
specifications. This method specifies an open
circuit test voltage and a test current. The voltage
drop across the closed contacts is measured. The
contact resistance is determined by Ohm’s Law
from the test current and the measure voltage
drop. MIL-DTL-3786, MIL-S-6807 and MIL-S-8805
require a maximum open circuit test voltage of 2
Vdc; they require a test current of 100 milliamperes.
MIL-S-83504 requires a maximum test voltage of
50 millivolts and a test current of 10 milliamperes.
When a switch is rated to make and break 5 or more
amperes, there is a difference. Contact resistance
is determined by measuring the voltage drop while
the switch is carrying the maximum rated current.
The voltage drop that occurs across the contacts
determines, in part, the contact temperature. If
the temperature rise of the contacts is sufficient,
it affects contact material. A chemical reaction
will take place that can cause an insulating film
to appear on the contacts. This film is present
between the contacts during the next switching
operation. This film formation can cause failure
due to increasing contact resistance. For switching
of very low voltages and currents, this resistance
may be the failure criteria.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Insulation Resistance
This is the resistance between two normally
insulated metal parts, such as a pair of terminals.
It is measured at a specific high DC potential,
usually 100 Vdc or 500 Vdc. Typical values for
new switches are in the range of thousands of
megohms. These values usually decrease during
switch life. This is a result of build-up of surface
contaminants. Typical industry standard “end of
life” criteria for the parameter are:
MIL-DTL-3786:
MIL-S-6807:
MIL-S-8805:
MIL-S-83504:
1000 megohms
(for plastic insulation)
Not specified
2000 megohms
1000 megohms
Another special test condition is commonly
specified. It measures insulation resistance for
switches in a high humidity atmosphere (90%-98%
R.H.). In this condition, condensation of moisture
commonly occurs on the surface of the insulating
material. Some types of insulation will absorb
varying amounts of moisture. This will normally
lower the insulation resistance. Typical industry
values for this condition are:
MIL-DTL-3786:
MIL-S-6807:
MIL-S-8805:
MIL-S-83504:
10 megohms
(for plastic insulation)
3 megohms after
drying
10 megohms
(for plastic material)
10 megohms
Dielectric Strength
This is the ability of the insulation to withstand
high voltage without breaking down. Typical
values for new switches in this test are in excess
of 1500 Vac RMS. During switch life, contaminants
and wear products deposit on the surface of the
insulation. This tends to reduce the dielectric
withstanding voltage. In testing for this condition,
a voltage considerably above rated voltage is
applied. Then, the leakage current is measured
at the end of life. Typical industry standard test
voltages and maximum allowable leakage currents
are as follows:
MIL-DTL-3786:
1000 Vac and 1 mA
maximum leakage
MIL-S-6807:
600 Vac RMS after life
10 microamperes
maximum leakage
MIL-S-8805:
1000 or 1000 plus
twice working voltage
(AC) RMS and 1mA
maximum leakage
MIL-S-83504:
500 Vac and 1 mA
maximum leakage
UL Standard:
900 Vac without
breakdown (UL
Standard (dependent
on test)
Voltage breakdown is another method for
www.grayhill.com
describing the ability of the insulating material
to withstand a high voltage. Voltage breakdown
describes the point at which an arc is struck and
maintained across the insulating surface with the
voltage applied between the conducting members.
ADDITIONAL LIFE FACTORS
Effect of Loads
On any switch, an arc is drawn while breaking a
circuit. This causes electrical erosion of the contacts.
This erosion normally increases contact resistance
and generates wear products. These wear products
contaminate insulating surfaces. This reduces
dielectric strength and insulation resistance.
The amount of this erosion is a function of current,
voltage, power factor, frequency and speed of
operation. The higher the current is, the hotter
the arc and the greater the erosion. The higher
the voltage is, the longer the arc duration and the
greater the erosion.
Inductance acts as an energy storage device. This
returns its energy to the circuit when the circuit
is broken. The amount of erosion in an inductive
circuit is proportionate to the amount of inductance.
Industry standard test inductance as described in
MIL-I-81023 is 140 millihenries. Other test loads
include 250 millihenries and 2.8 henries.
Effect of Ambient Temperature
Temperature extremes may affect switch
performance and life. Very high temperatures
may reduce the viscosity of lubricants. This allows
them to flow out of bearing areas. This can hasten
mechanical wear of shafts, detents, plungers, and
cause early mechanical failure. Contact lubricants
are sometimes used. Too little lubrication can
result in a high rate of mechanical wear. Too much
lubrication flowing from other bearing areas can
adversely affect dielectric strength and insulation
resistance.
Through careful design and selection of lubricants
most manufacturers attempt to minimize these
affects. Nevertheless, continual operation in high
ambient temperatures will shorten the life of a
switch regardless of design.
Extremely low ambient temperatures may also
create problems. Low temperatures may cause an
increase in the viscosity of the contact lubricant.
Higher viscosity can delay or prevent the closing
of contacts, causing high operating contact
resistance. Under certain atmospheric conditions,
ice may form on the contact surfaces. This also
causes high and erratic contact resistance.
Frequency can also affect erosion. The arcing
ends when the voltage passes through zero. To
a certain extent, the following is true. The higher
the frequency, the sooner arcing ends, the lower
the erosion.
Neither of these conditions may materially
reduce the life of the switch. However, it may
cause unsatisfactory operation. If the voltage of
the circuit is high enough, it can break down the
insulating layer. Some current will flow through the
high resistance contacts. A local heating action is
created, which tends to correct the condition in a
short period of time.
The speed of operation affects the duration of the
arc. Fast operation can extinguish the arc sooner.
This reduces the erosion, unless the air within the
switch is completely ionized.
Switches with high contact pressures may minimize
the low ambient temperature effect. This is
particularly true if the application calls for switching
signal level voltages and currents.
Actuating Force
Effects of Altitude
Rotational torque is the actuating force required to
turn a rotary switch through the various positions.
The actual torque or force required depends on
the design of the switch. It varies widely from one
design to another. See appropriate MIL Specs or
manufacturers literature for typical industry values
for specific designs.
When torque or force values are specified, it
is customary to give a minimum and maximum
value. During life, two offsetting factors may occur
to change the initial value. Relaxation of spring
members will tend to lower torque or force values.
Wear or “galling” of mating surfaces, however,
may tend to increase these values. Typical end
of life specifications may require the switch to fall
within the original range. Or, they may specify a
maximum percentage change from original value.
For example, “the rotational torque shall not change
more than 50% from its initial value.
In high altitudes, barometric pressure is lower. Low
pressure reduces the dielectric strength of the air.
The arc strikes at a lower voltage and remains
longer. This increases contact erosion. Switches
for use in high altitudes will therefore require derating in terms of loads and/or life.
Effects of Duty Cycle
Mechanical life testers cause accelerated life
testing. Testers operate switches at a rate of
approximately 10 cycles per minute. This rate is
greatly in excess of normal manual operation in
equipment. It constitutes a severe test of the switch.
Lubricants do not have an opportunity to redistribute
themselves over the bearing surfaces at this duty
cycle. The contact heating caused by arcing does
not have a chance to dissipate.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Thus, the switch runs “hot”, increased mechanical
wear and contact erosion result. Your application
probably requires manual operation of the switch
with an attendant low duty cycle. If so, you can
usually expect much longer switch life than is
shown by the accelerated life laboratory life tests.
Conclusion
Remember, load and life ratings are based
on manufacturers’ selected references. They
include accelerated life tests and an arbitrary
set of application parameters and failure criteria.
These parameters and criteria may not always
fit your application.
Then how do you know if a switch will give reliable
performance in your application?
How do you know if it will last the life of your
equipment?
Ask the switch manufacturer. Grayhill, and most
other reputable manufacturers have compiled
vast quantities of test data. We are in a position
to give a good estimate of a switch’s performance
in many nonstandard applications. You should
provide the following data:
Expected Life:
Load:
Operation:
Application:
Environment:
Failure Criteria:
in number of cycles
voltage, current, power
factor, and frequency
manual or mechanical, duty
cycle
type of equipment
altitude,
ambient
temperature range
relative humidity, corrosive
atmosphere, shock,
vibration, etc.
end of life contact
resistance, dielectric
strength, insulation
resistance, etc.
With this information, we can usually estimate
if a given switch is suitable for your application.
www.grayhill.com
Soldering
What causes failure in a new switch after it
has been installed? The principle failure is high
contact resistance caused by solder flux on the
contact surfaces. To avoid this, be sure to follow
good soldering practices. Use the proper solder
with the proper flux core, maintain the proper
soldering temperature, use the proper soldering
iron tip for the work, and never use liquid flux
when soldering a switch.
initially and 10.0 ohm maximum dc resistance
following environmental and mechanical tests.
Many equipment manufacturers feel they are
satisfying their needs with a measurement of .025
to 10 ohms for the expected life of the switch.
Under most circumstances, standard non-sealed
switches pass the larger value easily. The lower
value (.025 ohms) requires special attention and
parts for compliance over the life of the switch.
Do not use solvent baths or washes with any
unsealed electromechanical parts. Switches,
unless they have been especially protected suffer
badly. Solvents readily dissolve fluxes and carry
them into the contact area of switches. A thin, hard
flux coats the contact surface after the solvent
evaporates. Additionally, solvents may dissolve
and wash away lubricants in switches. Lubricant
loss may prevent proper mechanical action.
Switch Selection
Exercise similar precautions when you mount a
switch to a printed circuit board. Maintain proper
solder temperatures and follow proper cleaning
techniques. Avoid subjecting these switches to
lengthy solder baths. The excessive heat can
deform the plastics.
RFI/EMI Shielding
Some applications require shielding against Radio
Frequency Interference and/or Electro-Magnetic
Interference. Experts feel that the most effective
way to achieve shielding is to provide a conductive
bridge across the component mounting hole.
They also generally agree that there is no good
method for testing shielding. So, the equipment
manufacturers themselves must identify and solve
specific problems. Component manufacturers
can generally assist in the solution of shielding
problems.
RFI/EMI testing is incorporated into MILDTL-3786 for rotary switches. Requirements
are 1.0 ohm maximum dc resistance between
the mounting bushing and operating shaft
Whenever possible, use standard switches and
contact configurations. Standards provide the
greatest economy and the best delivery. When
you need a deviation, it pays to consult with your
suppliers as soon as possible. At the early stages
of the design, there are many low cost options
for achieving the results. At the late stages of
design, some of the options may no longer be
open. For example, size may be restricted. This
might result in a more costly redesign.
Typical standard rotary options are as follows:
coded contacts, homing rotor effect, progressively
shorting contacts, PC mountable terminals, rotary
switch spring return positions, and push-to-turn
or pull-to-turn mechanisms.
Limited panel space may be solved by a concentric
shaft rotary switch. It is two rotary switches,
located one behind the other. There are other
concentric shaft possibilities. A rotary switch can
be combined with another component. These
include a potentiometer, a pushbutton switch, and
a mechanical element. The most cost effective
design may be one of these concentric options.
But, selection must be made at the outset of
equipment design.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
1. SELECT A FACTOR
FACTOR: Current Life Rating
All switches are rated to make and break at least 100 milliamperes for 10,000 cycles of operation. Rating becomes a matter of interpretation. Carefully
review the Engineering Information on the previous pages. Ratings which assure a different life are possible; contact Grayhill.
25,000 Cycles At Load (Amps)
10,000 Cycles At Load (Amps)
6,000 Cycles At Load (Amps, UL)
19
Single Deck Switch Series Multi-Deck Switch Series
24 50/51 56 75 77 5000 08/09 42/44 43/54 53,57,59 71
—
—
15
1
—
—
.050
.200
—
—
.200
—
—
.100
—
.050
—
—
1
—
—
.250
.500
—
1,3,5*
1,3,5*
—
1,3,5*
1,3,5*
—
—
.250
.150, .250* —
—
—
* Varies with angle of throw and style.
FACTOR: Size
Maximum Dimension
Single Deck Switch Series
Multi-Deck Switch Series
In Inches (& Millimeters) 19 24 50 51 56 75 77 5000 08 09 42 44 53 57 59 71
Diameter, Behind Panel
2.280 1.015 .500 .561 .500 .298
1.015 .687 .750 1.015 1.170 1.350 1.190 1.190 .750
Length Behind Panel, 1 Deck .950 .580 .698 .698 .355 .500
.470 .960 .960 1.025 1.025 .916 .916 .916 .760
Behind Panel, Add'l Deck
— — — — — — — — .268 .268 .346 .346 .329 .326 .326 .218
Diameter, Behind Panel
(57,9) (25,8) (12,7) (14,2) (12,7) (7,6)
Length Behind Panel, 1 Deck (24,1) (14,7) (17,7) (17,7) (9,0) (12,7)
Behind Panel, Add'l Deck
— — — — — —
() (25,8) (17,4) (19,0) (25,8) (29,7) (34,3) (30,2) (30,2) (19,0)
() (11,9) (24,4) (24,4) (26,0) (26,0) (23,3) (23,3) (23,3) (19,3)
— — (6,8) (6,8) (8,8) (8,8) (8,4) (8,3) (8,3) (5,5)
* If multi-deck switch is needed, contact Grayhill.
FACTOR: Circuitry
Max. Positions
1 Deck (1Pole)*
Angle Of
Throw
Maximum
Decks**
Maximum Poles
Per Deck***
Shorting Or
Non-Shorting
15°
18°
22°30'
22°30'
12
12
12
1
12
10
8
2
N or S
N or S
N or S
N or S
Solder
Solder
Solder
Both
53
59
57
51
12
12
12
12
12
11
30°
30°
30°
30°
30°
30°
12
12
12
1
1
1
6
6
6
4
4
1
N or S
N or S
N or S
N or S
N or S
N
Both
Both
Solder
Both
Both
****
71
9
44
51
56
19
10
10
10
10
10
10
10
10
36°
36°
36°
36°
36°
36°
36°
36°
12
12
12
1
1
1
1
1
2
2
2
2
2
2
1
1
N or S
N or S
N or S
N
N or S
N or S
N or S
N or S
Both
Both
Both
PC
Both
Both
Both
Solder
8
71
42
75/77
50
56
24
5000
8
8
8
6
6
6
4
4
4
45°
45°
45°
60°
60°
60°
90°
90°
90°
12
12
1
6
12
1
12
6
1
4
4
2
3
3
2
2
2
2
N or S
N or S
N
N
N
N
N
N
N
Both
Solder
Both
Both
Solder
Both
Solder
Both
Both
9
44
50
9
44
50
44
9
50
24
20
16
16
* Maximum positions per pole depends
on number of poles per deck.
www.grayhill.com
** Based on 1 pole per deck. Number of decks
is also limited by the total number of poles.
Solder Lug
Or PC
Series
Number
*** Limited by total number of poles per switch.
****Choice of Faston or Solder Lug terminals.
Bulletin 1220
Rev 04/14
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Rotary Switch Standard Options
• Custom Switches With No
Tooling Required
• Easily Ordered Specials
1. Dummy Terminal
Used as tie point, it is not an active switch
position. Can be located at any specified position outside of active switch terminals. Priced
as active position. Example, a three position
switch with 2 dummy terminals would be
priced as a five position switch.
.072 +.000 –.002
(1,83 –0,05)
.034 ± .003
(0,86 ± 0,07)
.045
.047 (1,19)
(1,14)
.096 ± .001
(2,44 ± 0,03)
2. Enlarged Wire Holes
.032 ± .001
(0,81 ± 0,03)
R (2)
5. Notched Terminals
Used in place of the conventional solder lug
terminals.
6. External Shorting Links
.068 ± .005
(1,73 ± 0,13)
.045
(1,14)
Series 08A, 09A, 42H, 42M, 44H, and 44M:
Lug terminals for several wires; standard in Series
08M, 09M, 53, 57, and 59 switches.
3. High Density Wiring Terminal
.096 ± .001
(2,44 ± 0,03)
.0635 + .002 –.001
(1,61 + 0,05 – 0,02)
DIAMETER
The gold-plated terminal features a slot to accept
wires in addition to the conventional wire hole.
4. Taper Tab Terminals
.095 (2,41)
.280 (7,11)
45°
.062 ± .003
(1,57 ± 0,08)
DIAMETER
External shorting links, as shown in the drawing,
can be used in place of conventional solder
lug terminals in the Series 5000, 24, 42 or 43
rotary switches. Shorted terminals can also be
accomplished internally in the Series 71 rotary
switches. Solder lug terminals can be intermixed
on the same deck.
7. Non-Standard, Non-Turn
Devices
Switches without tabs
Series 08, 09, 42 and 44: There is no additional
charge for a front support plate without a nonturn tab.
Non-turn tab of non-standard projection
Series 08:
All tabs located at .260 inch radius from centerline of switch. The following projections
(inches) are available: .121; .094; .045; .032
Series 44:
From Centerline
Projection
.375" (9,53 mm) .062" (1,57 mm)
.531" (13,49 mm) .121" or .049"
(3,07 or 1,24 mm)
8. RFI Grounding
A silver-plated shaft and wave washer improve
DC grounding of shaft to mounting bushing, thus
minimizing possible radio frequency interference. Example: static and dynamic DC resistance after 25,000 cycle life test is maximum
100 milliohms. For concentric shaft switches,
discuss grounding with factory. Special handling
charges apply to small lots.
9. Electrostatic, Electromagnetic
Shielding
A metallic shield can be added between decks.
Grounding of the shield provides additional RFV
/EMI protection, Size and shape of the shield
depends on the equipment configuration and the
amount of protection required Price is dependant onthe number and type of shields required.
10. Unidirectional Rotation
The detenting system permits rotation in only one
direction. Usable only with continuous rotation
switches. Specify direction of rotation. Applicable
to 30° and 36° throw switches only.
Switch
Options For Styles A and S
Options For All Styles
Series# 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
.079 (2,01)
Used in place of conventional solder lug terminals.
Taper tab terminals are gold plated.
08 x x x
x x x
09 x x x
x x x
24 x x x x x x
42 x x* x x x x x x x x x x
43 x x x x x x* x x x
44 x x* x x x x x x x x x
50/51 x x
56 x x
53/57/59 x
54 x x x x x* x x x x x
71 x*
x x
5000 x x x x x x
* See description below for limitations.
www.grayhill.com
Patent Pending
©2013
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
11. Intermixing of Shorting and NonShorting Contacts
In some switches, non-shorting and shorting
contacts can be intermixed between decks. A
2-deck switch, for example could have shorting
contacts on deck 1 and non-shorting contacts
on deck 2. In a few switches, non-shorting
and shorting contacts can also be intermixed
between poles. A 2-pole per deck switch, for
example, could have non-shorting on pole #1,
and shorting on pole #2.
Series 08 and 09:
An 09M30 or 08M36 rotary switch can have
shorting and non-shorting contacts intermixed
between decks. Shorting and non-shorting
contacts can be intermixed between poles as
well as decks in styles A, S, P, and SP.
Example: an 08P36, 1-pole, 10 position switch
with terminals on one side of the switch would
be priced as a 2 deck, five position, one pole
per deck switch.
13. Homing Rotor (Bridging and
Shorting Deck) and Progressively
Shorting Deck
A homing rotor (bridging and shorting) switch
deck connects all terminals to the common except
the terminal in the selected switch position. For
example, in position 1, terminals 2 thru 12 are
CIRCUIT
DIAGRAM
Series 50, 51, and 56:
Non-shorting and shorting contacts can be
intermixed between poles.
Priced the same as standard switches. The
type of contacts on each pole must be precisely
indicated.
12. PC Mount Switches With
Terminals From One Side
of Switch
Series 71 PC mount switch has all terminals
on one side.
Series 08P, 09P, and 42P with non-shorting
contacts are also available with terminals limited
to one side. Contact Grayhill for a special part
number. This is accomplished by using 2 decks
per pole and placing the rotating contacts 180°
out of phase on each deck. The first deck picks
up the first half of the positions; the second
deck picks up the last half of the positions.
Common terminals are tied together by the PC
board circuitry.
A total of 12 decks (6 usable poles) is the
maximum per switch. Switches with the
maximum number of positions (12 for 30°,
or 10 for 36°) will have continuous rotation.
Rotation can be limited to less than the maximum
positions. For example, an 8 position Series 8P36
switch with terminals on one side, would pick
up 5 positions on the first deck and 3 positions
on the second deck.
Price is the same as standard switches with
comparable number of decks and positions.
www.grayhill.com
C
12
HOMING
ROTOR DECK
1
2
11
Series 42, 43, 44, and 54, in 30° or 36°:
Non-shorting and shorting contacts can be
intermixed between poles or decks.
Series 71:
Non-shorting and shorting contacts can be
intermixed between poles in fixed stop switches
only.
decks are used in combination with conventional
decks, it is important to remember that the stop
system limits the rotation of both types of decks.
For example, when a homing rotor deck Is used
in combination with a 6-position conventional
deck, the homing rotor is likewise limited to six
positions.
O-RINGS
10
3
9
4
5
8
6
7
connected to the common, and terminal 1 is
open. In position 2, terminal 3 thru 12 and 1 are
connected to the common, and terminal 2 is
open. A homing rotor deck will function for 25,000
mechanical cycles of operation.
The progressively shorting switch deck connects
consecutive switch positions to the common. For
example, in position 1, terminal 1 is connected
to the common; in position 2, terminals 1 and
2 are connected to the common; in position
CIRCUIT
DIAGRAM
C
PROGRESSIVELY
SHORTING DECK
1
2
14. Shaft and Panel Seal on
Concentric Shaft Switches
The following diagram shows the location of
the O-rings required to seal the shafts to the
bushings. When the concentric shaft switches
are sealed in this manner, the .125 inch diameter
shaft is supplied full round. Bushing-to-panel
sealing is accomplished by the panel seal kit.
15. Fixed Stop, Add-A-Pot
Switches
The rotary switch section of the Add-A-Pot rotary
switches can be built with a fixed mechanism
rather than the standard adjustable stop
mechanism. The front end of a switch of this type
is similar to the Series 43A or Series 54A style
concentric rotary switches. The total number of
decks is limited to three. The Series 43 is limited
to 1 pole per deck. Series 54 to 2 poles per deck.
3
4
5
6
3, terminals 1,2, and 3 are connected to the
common. A progressively shorting deck is limited
to a maximum of 6 positions. A progressively
shorting deck will function for 25,000 mechanical
cycles of operation.
16. Series 54 Concentric Shaft
Switch in 45°, 60°, and 90°
Throws
The Series 54A switch is available with these
angles of throw in Section A of the concentric
rotary switch. Section B is available in 30° angle
of throw only. Section A is limited to 1 to 3 decks,
non-shorting contacts, and 1 or 2 poles per deck.
Homing Rotor or Progressively Shorting decks
can be ordered as a deck of a 44A or 44M style
switch, or their sealed equivalents. Order up to
11 conventional decks and 1 special circuitry
deck. For a good detent feel, the switch is limited
to a total of 12 poles plus the homing rotor or
progressively shorting deck. Example: 6 2-pole
decks and a homing rotor. When these special
Bulletin 1222
Rev 04/14
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