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The H8M Series Molded Case Circuit Breaker (hereinafter referred to as
“circuit breaker”) is the high-tech product in the 21st century. This product is
characterized by advanced design, reliable performance, high technical
indicators, beautiful appearance, and small size.
1 Purpose and Scope of Application
This circuit breaker is suitable for the power system with AC 50 Hz, rated
isolation voltage up to 800 V, rated working voltage up to 690 V and rated
current up to 800 A. It is used to distribute electric energy and protect
circuits and power supply equipment from overload, short circuit,
undervoltage and other faults, and to prevent the infrequent operation of
the motor.
2 Standards Followed
The product complies with GB/T 14048.2-2008
Low-voltage Switchgear and
Controlgear — Part 2:
Circuit-breakers
and IEC 60947-2
Low-voltage
Switchgear and Controlgear — Part 2:
Low-voltage Circuit Breakers
, etc.
3 Model Description
Overload alarm without tripping is denoted by “I”
Flashover distance: No code with flashover; Code W without flashover
Wiring method: No code with wiring in front of the plate; Code H with
wiring behind the plate, C for plug-in connection, and
CH for pull-out connection (only for 3 poles)
No code for conventional products, and code Y with the special release
with prepaid kilowatt-hour meter
Application code: No code for power distribution; Code 2 for motor protection
Internal accessory code (see Table 2)
Overcurrent release type (see Table 1)
Type of neutral pole (N pole) of 4-pole circuit breaker (note)
Number of poles of circuit breaker: 3 for 3 poles; 4 for 4 poles
Circuit breaker rated current In (A) (see Table 3)
Operation mode: No code for handle direct operation;
Code M for electrical operation;
Code Z for handle rotation operation
Short-circuit breaking capacity level: C — Basic type; S — Standard type;
H — Advanced type; U — Current limiting type
Shell frame level rated current Inm (A) (see Table 3)
Molded Case Circuit Breaker
Design number
Enterprise code
Note: In 4-pole products, two types are provided for the neutral pole (N pole):
Type A: The N pole is not equipped with an overcurrent release and is normally on, and
is not opened/closed with the other three poles.
Type B: The N pole is not equipped with an overcurrent release, and is closed/opened
with the other three poles.
