Molded case circuit breaker adopts thermal-magnetic trip principle. Thermal component responds to long-time overload current for delayed tripping, magnetic component triggers instantaneous trip when short-circuit fault occurs. It isolates fault circuit quickly to protect cables and downstream loads, and supports manual closing and opening operation.

Certification: CE

Insulated housing, thermal-magnetic trip assembly, contact group, arc extinguishing chamber, operating handle. Common faults: contact overheating, mis-trip, arc chamber carbon deposition, trip element aging.