What are the selection principles of miniature circuit breakers?

Promulgator : TAIXIDate : 2017-03-16Views : 1780

1. General selection principle
Rated operating voltage of the miniature circuit breakers ≥ line rated voltage
Rated current of the miniature circuit breaker ≥ line calculation load current
Rated short-circuit making-breaking capability of the miniature circuit-breaker ≥ The maximum short-circuit current that may appear in the line
Instantaneous release set current of the miniature circuit breaker ≤ 0.8 times line end single-phase to ground short-circuit current

2. Selection of miniature circuit breaker for wire protection
Long delay current setting value ≤ line load current
Instantaneous operation setting value ≤ (6-20) times the line calculate load current

3. Selection of miniature circuit breaker for motor protection
Long delay current setting = motor rated current
Instantaneous operation setting value = (8-15) times the motor rated current (for the protection of squirrel-cage motor) = (3-6) times the motor rated current (to protect the winding motor)

 

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