MCB (Miniature Circuit Breaker)—rated current not more than 100 A.
Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation.
There are three main types of MCBs: 1. Type B – trips between 3 and 5 times full load current; 2. Type C – trips between 5 and 10 times full load current; 3. Type D – trips between 10 and 20 times full load current.

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