SFN4D
Low profile safety relay
with forcibly guided
double contacts
SFN4D
RELAY
FEATURES
53.3
33.0
• Relay complies with EN 50205, Type B
• Polarized magnet system with snap action function
14.5
• Extremely small total power loss
- Nominal coil power consumption of 390mW
- Double contacts with low contact resistance,
e.g. [(6A)2 2.5m] 4NO = 360mW
Length: 3.0
• Relay height, 14.5mm
Tolerance ±0.3 mm
Weight approx. 42 g
• Reinforced insulation according to EN 50178
- between coil-contacts and contacts-contacts
- rated voltage of the circuits 230 / 400V or 277 / 480Vrms
- rated impulse voltage of 6kV clearance 5.5 mm
- pollution degree 2 creepage distance 5.5mm
SPECIFICATIONS
Contact
Characteristics
Contact configuration (a = normally open / NO,
b = normally closed / NC)
4a2b
AgSnO2, with Au flash
Contact material
30m
2.5m
Contact resistance (initial at 6V DC, 1A)
Typical contact resistance
Max. switching capacity
6A/8A*1 250V AC
Max. switching voltage
500V AC / DC
Min. switching voltage / min. switching current Reference 10V / 10mA
Pick-up / drop-out / bounce time
23 / 6*2 / 2ms
(approx. values at U
)
nominal
107ops
Mechanical life
Max. switching frequency (without load)
Permissible ambient temperature at nominal
power consumption*3
Upper temperature limit
5Hz
-25°C to 92°C
105°C
Test voltage:
open contact / contact-contact / contact-coil
2500 / 4000 /
5000Vrms
109
Insulation resistance at 500V DC (initial)
Shock resistance (11ms)
NO/NC*4
20 / 15G
Vibration resistance 10 – 200 Hz (10 – 55 Hz,
amplitude 2 mm)*4
Degree of protection
10G
RT III*5
Unit weight
42g
Important: Relay characteristics may be influenced by:
Coil
Operate / release
and holding at 20°C (% of Unominal)*3
75% / 25%
min. 48%
Pick-up/nominal power consumption
219-236 / 390-420mW
• strong external magnetic fields
• magnetic conductive materials near the relay
• narrow top-to-top mounting (printed surface to printed surface)
*1 See “ELECTRICAL LIFE (Reference Data)*1” on page 2.
*2 Without diode
*3 See also “REFERENCE DATA” on page 3.
*4 Contact interruption 1,000,000*2
*1 Test conditions: Room temperature, breathing hole closed, dielectric strength according to EN61810-1:2004.
*2 Has to be confirmed
DIMENSIONS
CAD Data
Data from our Web site.
Download CAD
Outer dimensions
CAD Data
53.3
3
14.5
0.3 Stand-off
33
Breathing hole
1
5.4
15
12.5
15
0.3 (2x)
5.4
0.48 (12x)
3.34
General tolerance: 0.3
(2.16)
12.5 7.5 7.5
Projection mode:
Schematic (Bottom view)
9
10
15
16
7
8
13
14
5
6
11
12
PC board pattern (Bottom view)
53.3
2-
3.34
+1
15
12.5
15
12.5 7.5 7.5
33
5.4
1.4 dia., typical value for manual insertion
1.6 dia., typical value for automatic insertion
2
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SFN4D
REFERENCE DATA
Coil voltage characteristics
170
permissible coil voltage
without contact load
160
150
140
130
Coil applied voltage [%]
120
operative range of the coil voltage
110
100
90
80
typical operate and release voltage with the +/-3σ range
without preheated coil
70
60
min. recommended
holding voltage
50
40
30
20
10
-30
min. release voltage at the end of the electrical life
-20
-10
0
10
20
30
40
50
60
70
80
90
100 110
Ambient temperature [oC]
Thermic operating range
Switching time in relation to coil excitement at 20°C
170
4 x 8A
4 x 6A
4 x 0A
170
4 NO contacts
simultaneously
160
160
150
To the right of the curves
the relay operates in a
temperature range exceeding
the stated limit of 105oC
140
130
150
140
110
Coil applied voltage [%]
Coil applied voltage [%]
120
100
90
80
70
60
130
bbm
120
110
100
50
90
40
30
80
NC 1
20
NO 4
70
10
0
40
50
60
70
80
Ambient temperature
ds_61408_en_sfn4d: 130312D
90
[oC]
100
110
60
0
10
20
30
40
50
60
Typ. pick-up time [ms]
3
SFN4D
REFERENCE DATA, continued
Load limit curve
500
300
300 W
200
Contact voltage [VDC]
250 W
200 W
150 W
100
70
100 W
80 W
50
60 W
30
40 W
20 W
20
10 W
10
0.1
0.2
0.3
0.5
0.7
1
2
3
4
5 6 7 8 10
Contact current [A]
Time / current characteristic
10000
1000
Current [A]
Fuse-link D II 6A , 500 V
operating class gL
(6A gG) DIN 49 515
100
SFN4D, Contact withstand current
10
Fuse-link 6,3A F (quick acting)
glass tube 5 x 20 mm, 250V
IEC 60 127-2/2
1
0.001
0.01
0.1
1
10
100
1000
10000
100000
Time [Sec]
4
ds_61408_en_sfn4d: 130312D
SFN4D
APPLICATION NOTES
The SFN4D Safety Relay
NC contact 5-6
Armature
Sub card 1
NO contact 12-11
NO contact 7-8
Main card
Sub card 2
NO contact 14-13
NO contact 9-10
NC contact 16-15
Remark:
Only NC 5-6 monitors
all NO contacts!
5
7
9
12
14
16
6
8
10
11
13
15
Legend for interpreting contact conditions
Contact
Condition
NC (Normally Closed)
NO (Normally Open)
Closed
Fully open
Open
Open or closed
Closed
Fully open
Open
Open or closed
0
Maximum
(~1.5mm)
>0.5mm
(forcibly guided)
Not defined
0
Maximum
(~1.5mm)
>0.5mm
(forcibly guided)
Not defined
Symbol
Contact gap
The SFN4D under normal operating conditions
Condition
- Coil deenergized.
- Armature in deenergized
position.
- NC contacts closed.
- NO contacts have a contact
gap of approx. 1.5mm.
- Coil energized.
- Armature in energized
position.
- NO contacts closed.
- NC contacts have a contact
gap of approx. 1.5mm.
ds_61408_en_sfn4d: 130312D
Illustration of Relay State
Condition of Contacts
5
7
9
12
14
16
6
8
10
11
13
15
5
7
9
12
14
16
6
8
10
11
13
15
5
SFN4D
The SFN4D safety relay with welded contacts
Condition
Illustration of Relay State
Condition of Contacts
- NC 5-6 welded.
- Coil energized.
- Armature nearly in
deenergized position.
5
7
9
12
14
16
6
8
10
11
13
15
- NC 16-15 welded.
- Coil energized.
- Armature nearly in
deenergized position.
5
7
9
12
14
16
6
8
10
11
13
15
- NO 12-11 welded.
- Coil deenergized.
- Armature nearly in
energized position.
5
7
9
12
14
16
6
8
10
11
13
15
- NO 14-13 welded.
- Coil deenergized.
- Armature in nearly
energized position.
5
7
9
12
14
16
6
8
10
11
13
15
- NO 7-8 welded.
- Coil deenergized.
- Armature in deenergized
position.
5
7
9
12
14
16
6
8
10
11
13
15
- NO 9-10 welded.
- Coil deenergized.
- Armature in deenergized
position.
6
5
7
9
12
14
16
6
8
10
11
13
15
- All NO contacts are forcibly
guided.
- The NO contact gaps are
min. 0.5mm.
- For NC 16-15, the contact
condition is not defined.
- All NO contacts are forcibly
guided.
- The NO contact gaps are
min. 0.5mm.
- For NC 5-6, the contact
condition is not defined.
- All (both) NC contacts are
forcibly guided.
- The NC contact gaps are min.
0.5mm.
- For all NO contacts, the
contact condition is not
defined.
- All (both) NC contacts are
forcibly guided.
- The NC contact gaps are min.
0.5mm.
- For all NO contacts, the
contact condition is not
defined.
- NC 16-15 is closed!!
- All non-welded NO
contacts show their max.
contact gap.
- NC 5-6 forcibly guided to the
welded contact by sub card 1.
The contact gap is min.
0.5mm.
- NC 16-15 is closed!!
- All non-welded NO
contacts show their max.
contact gap.
- NC 5-6 forcibly guided to the
welded contact by sub card 2.
The contact gap is min.
0.5mm.
ds_61408_en_sfn4d: 130312D
SFN4D
Failure modes, application examples
1)Feedback loop, 2) Self-holding circuit, 3) Safety circuit, 4) Auxiliary contacts
Condition of contacts at deenergized coil
K1
1. Self-holding circuit, three safety circuits
K1
K2
5
7
9
12
14
16
6
8
10
11
13
15
13
11
10
8
15
5
14
12
9
7
16
1)
2)
2)
3)
3)
3)
7
9
12
14
16
6
8
10
11
13
15
One contact welded, e.g. NO 9-10 of K1.
K2
6
5
6
13
11
10
8
15
5
14
12
9
7
16
Condition of contacts at deenergized coil
5
7
9
12
14
16
6
8
10
11
13
15
K1
4)
One contact welded, e.g. NO 12-11 of K2.
K2
6
13
11
10
8
15
5
14
12
9
7
16
Condition of contacts at deenergized coil
K1
2.1. Four safety circuits
5
7
9
12
14
16
6
8
10
11
13
15
One contact welded, e.g. NO 9-10 of K1.
K1
5
7
9
12
14
16
6
8
10
11
13
15
K2 6
13
11
10
8
15
5
14
12
9
7
16
1)
3)
3)
3)
3)
K2
6
13
11
10
8
15
5
14
12
9
7
16
Condition of contacts at deenergized coil
K1
4)
One contact welded, e.g. NO 12-11 of K2.
5
7
9
12
14
16
6
8
10
11
13
15
(see wiring example, p. 8)
K2
6
13
11
10
8
15
5
14
12
9
7
16
Condition of contacts at deenergized coil
2.2. Two safety circuits
7
9
12
14
16
6
8
10
11
13
15
6
13
11
10
8
15
5
14
12
9
7
16
1)
{
K2
5
{
K1
3)
3)
4)
(see wiring example, p. 8)
ds_61408_en_sfn4d: 130312D
Both contacts of one path are welded,
e.g. NO 7-8 and NO 14-13.
A safety circuit needs two paths in this
failure mode. The contacts 9-10, 12-11,
and 14-13 of K1 interrupt the load.
K1
K2
5
7
9
12
14
16
6
8
10
11
13
15
6
13
11
10
8
15
5
14
12
9
7
16
Condition of contacts at deenergized coil
Both contacts of one path are welded,
e.g. NO 9-10 and NO 12-11.
A safety circuit needs two paths in this
failure mode. The contacts 7-8, 12-11,
and 14-13 of K1 interrupt the load.
K1
K2
5
7
9
12
14
16
6
8
10
11
13
15
6
13
11
10
8
15
5
14
12
9
7
16
7
SFN4D
Wiring for application examples 2.1 and 2.2
1+
-2
5
6
11
12
7
8
13
14
9
10
15
16
16
15
10
9
14
13
8
7
12
11
6
5
-2
+1
1st layer
2nd layer
For Cautions for Use, see Relay Technical Information.
8
ds_61408_en_sfn4d: 130312D
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