The most important feature of the wiring behind the board is that the circuit breaker can be replaced or repaired without having to re-wire, just disconnect the previous power supply. Due to the special structure, the product has been equipped with special mounting plate, mounting screws and connecting screws according to the design requirements when leaving the factory. It is necessary to pay special attention to the fact that the reliability of the contact of the large-capacity circuit breaker will directly affect the normal use of the circuit breaker. Therefore, attention must be paid to the installation and the installation must be carried out strictly according to the manufacturer's requirements.

There are three kinds of tripping modes: thermal tripping, electromagnetic tripping and multiple tripping. When a general overload occurs to the line, although the overload current cannot make the electromagnetic release act, it can make the thermal element generate a certain amount of heat, make the bimetallic sheet bend upward under the heat, push the lever to disconnect the hook from the latch, disconnect the main contact, and cut off the power supply. When the short circuit or serious overload current occurs in the line, the short circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic release generates enough suction to absorb the armature and impact the lever, so that the hook rotates upward around the rotating shaft base and disengages from the latch, and the latch breaks the three main contacts under the action of the reaction spring, cutting off the power supply.