The miniature circuit breaker is generally composed of a plastic shell, an over-current release, an operating mechanism, a contact, and an arc extinguishing device. The utility model is characterized in that the utility model adopts the double connection function, and the utility model can connect the standard bus line and the flexible wire more conveniently and rapidly. And the high resistance shell and part of the functions are used in imported natural, high temperature resistant and impact resistant plastic, so all the parts are installed in the plastic base inside, when overload and fault occurs, delay release and instantaneous release through the transmission rod opens fast operating mechanism. Breaking contact to drive. The miniature circuit breaker is widely used in the fields of industry, commerce, high-rise building and civil residence because of its characteristics such as the installation of the track, the size of the module, the function diversification, the modeling art, the use safety and so on.
1. General principles for small circuit breakers
Rated voltage rated voltage or line miniature circuit breaker; rated current is more than line of miniature circuit breakers calculated load current; rated short-circuit breaker through maximum short-circuit current breaking capacity is more than possible in the line; the instantaneous tripping miniature circuit breaker setting current equal to or less than 0.8 times at the end of the line single phase short-circuit current
2. Selection of miniature circuit breaker for wire protection
Long time delay current setting value is less than or equal to the line load current; instantaneous setting value = (6-20) double line calculation of load current
3. Selection of miniature circuit breaker for motor protection
Long time delay current setting value = motor rated current; instantaneous setting value = (8-15) times the motor rated current (motor protection cage) = (3-6) times the motor rated current (protection of winding motor)
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