MCCB circuit breaker CSDM7-125H-4300 CSDM7-125-4300 4P 125A 125a mccb industrial circuit breaker thermal and magnetic circuit breaker

125A rated load, meeting the long-term operation needs of medium and high-power equipment, suitable for main circuits and branch circuits of three-phase four-wire power distribution systems.Thermal-magnetic dual protection, integrating "overload delayed tripping + short-circuit instantaneous tripping" functions. No external power supply required, and circuit protection is maintained even in power-off state.

Aiming at frequent short-circuit and overload problems in industrial scenarios, the tripping response mechanism is optimized. Uder 50KA short-circuit current, it can be quickly disconnected and quickly block the proliferation of faults and prevent damage to power distribution cabinets and backend equipment due to long-term faults.

Adopting a four-pole synchronous action structure, the live wire and neutral wire "act and stop simultaneously" during switching. It solves the problem of excessive neutral wire current caused by unbalanced three-phase loads, especially suitable for nonlinear load scenarios such as frequency converters and servo motors, eliminating the risk of equipment voltage abnormality and burnout caused by neutral wire breakage.

The circuit structure design is optimized to improve anti-electromagnetic interference capability, enabling stable operation in strong electromagnetic environments (such as machine shops and around frequency converters). The shell's high and low temperature resistance is upgraded, suitable for special scenarios such as outdoor power distribution rooms and low-temperature workshops.