Series M
.5" (12.7mm) Center-to-Center Spacing
Features:
Compact Modular Design for Low Power Circuits
–
Suitable for surface connection applications using channel-
assembled 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.
Dual Row
TERMINAL DESIGNATIONS
*MA
BARRIER STYLE
Series M Variations
MA
terminal bar with two
No. 8-32 screws
MAQ
four .250" side
quick-connects
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
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 quick-
connects 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.
ci c tions su ct to c n .
Dimensions are shown for
reference purposes only.
e
at o s:
How to Order
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.
Mounting
Dimensions
Inches
Metric
(mm)
Overall
Dimensions
Inches
Metric
(mm)
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 sub ect to change
without notice.
Number of
Terminals
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1.000
1.500
2.000
2.500
3.000
3.500
4.500
25.40
38.10
50.80
63.50
76.20
88.90
114.30
1.375
1.875
2.375
2.875
3.375
3.875
4.375
34.92
47.62
60.32
73.00
85.72
98.42
111.12
Dual Row
4.000 101.60
5.000 127.00
5.500 139.70
6.000 152.40
6.500 165.10
7.000 177.80
7.500 190.50
8.000 203.20
8.500 215.90
9.000 228.60
9.500 241.30
4.875 123.82
5.387 136.52
5.875 149.22
6.375 161.92
6.875 174.62
7.375 187.32
BARRIER STYLE
7.875 200.02
8.375 212.72
8.875 225.42
9.375 238.12
9.875 250.82
Series M Dimensions
O.D.
M.D.
.187
(4.76)
10.000 254.00 10.375 263.52
10.500 266.70 10.875 276.22
11.000 279.40
11.500 292.10
11.375 288.92
11.875 301.62
12.000 304.80 12.375 314.32
12.500 317.50 12.875 327.02
1.125
(28.57)
.937
(23.81)
24
Dimensions shown are ± 0.030"
.196 Dia. Mtg. Hole
(4.97)
.328
(8.33)
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 umper 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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