MCCB circuit breaker CSDM7-250L-4300 CSDM7-250-4300 4P 250A 250a mccb industrial circuit breaker thermal and magnetic circuit breaker

For mixed scenarios with short-circuit current ≤ 36KA (e.g., workshops with office areas, community commercial centers), the 36KA breaking capacity precisely covers conventional short-circuit faults without redundant investment. The 4P full-pole design enables synchronous monitoring, switching on/off of three live wires and neutral wire, preventing overloads in single-phase circuits (such as sockets and lighting) from affecting three-phase power systems (such as air conditioners and water pumps), and eliminating protection blind spots in mixed-connected circuits.

The 250A rated current can carry multiple types of loads simultaneously—it can not only cover three-phase equipment such as 55KW workshop motors and regional air conditioners in shopping malls but also manage single-phase circuits such as office lighting and cash register systems. There is no need to set up multiple circuit breakers separately, which simplifies the layout of distribution cabinets and reduces the planning and procurement costs of the power distribution system.

Built-in graded response logic for overload-short circuit: When facing slow overloads in circuits such as lighting and sockets (e.g., simultaneous startup of multiple devices), the thermal trip acts progressively to avoid "one-size-fits-all" power cutoff; in case of emergency faults such as line short circuits, the magnetic trip triggers instantly (≤0.05s) to cut off the full-pole circuit. It adapts to the complex current changes of mixed loads, balancing power supply continuity and fault safety.