Miniature circuit breaker consists of operating mechanism, contacts, protection devices (various releases), arc extinguishing system, etc. Its main contact is closed manually or electrically. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply. When a short circuit or serious overload occurs in the circuit, the armature of the overcurrent release is attracted, causing the free tripping mechanism to operate, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal tripper heats up and bends the bimetallic piece, pushing the free tripping mechanism into action. When the circuit is under-voltage, the armature of the under-voltage release is released. It also activates the free tripping mechanism.

 

The MCBs designed and produced by Leadtop are scientifically designed, use safe materials, and have characteristics of rapid response, safety and fire prevention, and rapid breaking.