and infrastructure with function of overload protection; Short circuit protection isolation;
switchboard circuit breaker mcb box is a kind of terminal protection apparatus widely used in building electrical terminal distribution device.Used for short-circuit, overload, overvoltage protection of single-phase and three-phase below 125A, including single-pole 1P, two-pole 2P, three-pole 3P, four-pole 4P.
The miniature switchboard circuit breaker mcb box circuit breaker is composed of operating mechanism, contact, protection device (various trippers), arc extinguishing system, etc.The main contact is manually operated or electrically closed.After the main contact is closed, the free trip mechanism locks the main contact in the closing position.The coil of the over-current trip and the heat element of the thermal trip are in series with the main circuit, and the coil of the under-voltage trip is in parallel with the power supply.
In the electrical design of civil buildings, the miniature circuit breaker is mainly used for the line overload, short circuit, over current, voltage loss, undervoltage, earth, leakage, double power automatic switching and motor infrequent start protection, operation and other purposes.
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