Series M .5" (12.7mm) Center-to-Center Spacing
Features:
Dual Row
Compact Modular Design for Low Power Circuits –
Suitable for surface connection applications using channelassembled modular construction.
All-Surface Mountability – Requires no additional
insulation. Electro tin-coated steel mounting channel has
two .196" diameter mounting holes.
Thermo-Set Phenolic Barrier-Type Terminal Blocks –
One thru 24 terminals on 1/2" center-to-center spacing.
Broad Choice of Terminal Connections – Available in
three screw designs and two .250" wide quick-connect
variations offering up to four connections per terminal.
Wire Sizes – M Series (No. 6-32 screw) is UL recognized
for No. 22AWG to No. 14AWG. MA Series (No. 8-32 screw)
is UL recognized for No. 22AWG to No. 12AWG. CSA
requires lugs on wire larger than No. 14AWG for Series MA,
and CSA requires lugs on No. 16AWG for Series M.
Current/Voltage Rating – MA Series 25A/300V, M Series
15A/300V
Recognition and Listing – Various terminal types are UL
recognized and CSA certified.
TERMINAL DESIGNATIONS
16-gauge (.051") brass terminal bar with two No.
8-32 plated steel screws per terminal accepting wire
up to No. 12AWG
*MAQ Four .250" x .032" brass quick-connect tabs per
terminal accepting wire up to No. 12AWG
*MALQ Two .250" x .032" brass quick-connect tabs and one
No. 8-32 plated steel screw per terminal accepting
wire up to No. 12AWG. Rated 25A/300V
*M
Brass terminal bar with two No. 6-32 plated steel
screws per terminal accepting wire up to No. 14AWG
*MC
Brass terminal bar with two-piece No. 6-32 plated
steel, capitvated clamp assemblies per terminal
accepting wire up to No. 14AWG
BARRIER STYLE
*MA
Series M Variations
MA
terminal bar with two
No. 8-32 screws
MAQ
four .250" side
quick-connects
Recognized under the Components Program of
Underwriters Laboratories, Inc. Standard 1059,
Guide No. XCFR2, File No. E62557.
Guide No. 22.2 No. 158, Report No. LR39186-1.
MALQ
two .250" wide quickconnects and one
No. 8-32 screw
M
terminal bar with two No.
6-32 screws
MC
terminal bar with two
captivated clamp assembles
34
www.curtisind.com
Curtis Industries
A Division of Powers Holdings, Inc.
6SHci¿cDtionssuEMHcttocKDnJH.
Dimensions are shown for
reference purposes only.
6SeFL¿FatLoQs:
How to Order
Center-to-Center Spacing: .5" (12.7mm)
Wire Range:
UL Recognized
MA - No. 22AWG to 12 AWG
M - No. 22 AWG to 14 AWG
CSA:
Must use lugs for wire larger than
MA - 12 AWG
M - 16 AWG
No. of Terminals: 1 thru 24
Voltage Rating:
CSA – 300V
UL – 150V – General Industrial
250V – Commercial Appliance
Tightening Torque: 12 in.-lbs.
Current Rating: UL and CSA: 15A (M), 25A (MA)
Housing:
Material
Phenolic
Continuous Use
Temp. (UL Index)
150°C (302°F)
Flammability Rating
94V-0
Water Absorption
(24 hrs. % wt. gain) .05%
Chemical Resistance
Resistant to most organic
solvents
Breakdown Voltage:
Terminal - Terminal
7,400V Typ.
Terminal - Ground
7,800V Typ.
Note: Speci¿cations contained herein are subMect to change
without notice.
M Series terminal blocks are ordered by listing a composite
number made up of the model designation followed by the
number of poles required for the application. Example: Type
M 10-pole block becomes stock number M-10.
1.125
(28.57)
.196 Dia. Mtg. Hole
(4.97)
.328
(8.33)
.937
(23.81)
.187
(4.76)
M.D.
Metric
(mm)
Inches
Metric
(mm)
1
1.000
25.40
1.375
34.92
2
1.500
38.10
1.875
47.62
3
2.000
50.80
2.375
60.32
4
2.500
63.50
2.875
73.00
5
3.000
76.20
3.375
85.72
6
3.500
88.90
3.875
98.42
7
4.000 101.60
4.375
111.12
8
4.500
114.30
4.875 123.82
9
5.000 127.00
5.387 136.52
10
5.500 139.70
5.875 149.22
11
6.000 152.40
6.375 161.92
12
6.500 165.10
6.875 174.62
13
7.000 177.80
7.375 187.32
14
7.500 190.50
7.875 200.02
15
8.000 203.20
8.375 212.72
16
8.500 215.90
8.875 225.42
17
9.000 228.60
9.375 238.12
18
9.500 241.30
9.875 250.82
19
10.000 254.00 10.375 263.52
20
10.500 266.70 10.875 276.22
21
11.000 279.40
11.375 288.92
22
11.500 292.10
11.875 301.62
23
12.000 304.80 12.375 314.32
24
12.500 317.50 12.875 327.02
BARRIER STYLE
O.D.
Inches
Overall
Dimensions
Dual Row
Series M Dimensions
Mounting
Dimensions
Number of
Terminals
Dimensions shown are ± 0.030"
No. 6-32 Terminal Screw (M)
No. 8-32 Terminal Screw (MA)
NOTE: mm dim. are shown in parentheses
Series M Accessories
COVER
Plain cover of 1/16” thick black bakelite with two mounting
studs. Supplied loose for customer installation.
JUMPER
Brass Mumper rates at 25 amps.
Part No. 258-A5
Dimensions are in inches and millimeters
unless otherwise speci¿ed.
Values in parentheses are metric equivalents.
Curtis Industries
A Division of Powers Holdings, Inc.
1-800-657-0853
35
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