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December 2004
Circuit Breaker Operating Mechanisms
Flange Mounted – Fixed Depth
Product Description
Type C371 Circuit Breaker Operating
Mechanisms are designed for installa-
tion in control enclosures where main
or branch circuit protective devices are
required. All circuit breaker mecha-
nisms are suitable for right hand
mounting.
Auxiliary contacts are not available for
mounting on operating mechanism.
Where required, have them installed in
circuit breaker.
Table 29. Operating Mechanisms for Circuit Breakers — Flange Mounted Variable Depth
ᕃ
For increased maximum allowable depth, see Connecting Rods below.
ᕄ
Dimensions shown are from panel flange surface.
Table 30. Handle Only
Channel Support Kit –
Rod not supplied in Kit
For use to prevent bending of the operating handle mounting surface. This is especially
useful when the operating handle is mounted on a channel in a multi-door enclosure.
Kit included in 600 through 1200 ampere mechanisms. Catalogue Number C371CS6
Table 31. Connecting Rods
Increase Maximum Allowable Depth by 5 Inches
Circuit Breaker or
Motor Circuit
Protector
Frame
Size
Variable Depth
Mounting
Range
Min./Max.
(Inches)
ᕃ
ᕄ
Operating
Mechanism Only
– Does Not
Include Handle
Operating Mechanism With 4 Inch Handle & Rod
For NEMA 1-12 Enclosure For NEMA 4 Enclosure
Catalogue
Number
Catalogue Number Catalogue Number
HMCP, EHD, FDB, FD, FDC, HFD 150 6-1/2 to 16 C371E C371E1 C371E2
HMCP, HJD, JD, JDB, JDC
HMCP, DK, HKD, KD, KDB
250
400
6-1/2 to 16-5/8 C371F C371F5 C371F6
HLD, LD, LDC 600 8-1/2 to 22 C371G C371G5 C371G6
MD, MDS
HND, ND, NDC
800
1200
8-3/4 to 22
9-3/4 to 22
C371K C371K5 C371K6
Circuit Breaker
Frame Size
(Amperes)
NEMA
Enclosure
Type
Operating
Handle
Length
Catalogue
Number
150 1-3R-3-12
4
4 Inches
4 Inches
C371H1
C371H2
1-3R-3-12
4
6 Inches
6 Inches
C371H3
C371H4
250 thru
1200
1-3R-3-12
4
4 Inches
4 Inches
C371H5
C371H6
1-3R-3-12
4
6 Inches
6 Inches
C371H7
C371H8
Application Catalogue Number
Disconnect Switches
30 , 60, 100, 200 Ampere
Circuit Breakers
150, 250, 400 Ampere
C371CS1
Circuit Breakers
600, 800, 1200 Ampere
C371CS2
Complete Circuit Breaker
Operating Mechanism with
Operating Handle – C371E1
Handle Only – C371H1
+
+
Circuit Breakers
Motor Circuit Protectors
Operating Mechanisms
Listed Above
Listed Above
Operating Handle
For Safety Door Hardware – see Page 27