BBK series molded case circuit breakerDetailed product description：

1. Scope of application

BBK series molded case circuit breakers (hereinafter referred to as circuit breakers) are suitable for circuits with AC 50Hz (60Hz), rated insulation voltage 690V, rated working voltage 660V and below, DC 250V and below, and rated current 12.5-1250A. They are used to distribute electrical energy, perform infrequent closing and opening under normal conditions, and provide protection in case of overload, short circuit, and undervoltage of lines and equipment. Circuit breakers with rated shell current of 400 and below can also be used for infrequent starting, interruption during operation, and protection against motor overload, short circuit, and undervoltage of squirrel cage motors. The circuit breaker complies with standards such as IEC947-2, GB14048.2, GB14048.4, etc.

2. Model and meaning



Note: Circuit breakers for power distribution have no code; The motor protection type is "2".
The handle can be operated directly without a code; Electric operation function "P" represents; The external rotation handle operation is indicated by "Z".
Rated short-circuit breaking capacity level: E-economy type S-standard type M-medium high breaking type H-high breaking type
3. Classification
Divided by installation method: vertical installation, modular installation
Divided by the purpose of the circuit breaker: distribution protection type, motor protection type
Divided by wiring method: front board wiring, back board wiring, plug-in wiring;
Divided by operation mode: direct operation with the handle, external rotation of the handle operation, and electric operation;
According to the type of release, there are only momentary action release (electrical release) and thermal+electromagnetic release (compound);
Divided by number of poles: two poles, three poles, four poles;
There are five types of neutral pole (N-pole) in a four pole circuit breaker:
Type A: The N pole does not have an overcurrent release installed, and the N pole is always connected and does not open or close together with the other three poles;
Type B: The N-pole does not have an overcurrent release installed, and the N-pole is connected and disconnected together with the other three poles;
Type C: The N-pole is equipped with an overcurrent release, and the N-pole is connected and disconnected together with the other three poles;
D-type: The N-pole is equipped with an overcurrent release, and the N-pole is always connected and does not open or close together with the other three poles;
Type E: Neutral wire breakage protector with N pole installed, and the N pole is connected and disconnected together with the other three poles.