ATO 1 pole 63 amp MCB miniature circuit breaker is an electrical switch to turn off the electrical circuit during a faulty condition to protect conductors.
Circuit Breaker Information
Circuit Breaker Dimension (Unit: mm)
Tips: Overload protection of miniature circuit breaker
The overload protection function of the miniature circuit breaker is based on the principle that the bimetal is oriented and bent regularly as the temperature rises. After the miniature circuit breaker is closed, in the normal working state, the internal bimetallic sheet generates heat due to a certain current passing through it. The two pieces of metal have different coefficients of thermal expansion and cause bending. The bending angle of the normal current (1.13In) is not large, so the thrust is not enough to trip the tripping mechanism. When the line is generally overloaded and the overload current (1.45In) is reached, the large bending angle of the bimetal touches the lever in the tripping mechanism, and the thrust is sufficient to push the tripping mechanism, so that the miniature circuit breaker trips and plays a role of overload protection. The magnitude of the current flowing through the MCB is different, and the degree of bending of the bimetallic sheet is also different. When the circuit is generally overloaded, the tripping time of the circuit breaker is generally longer because the overload current is not too large. The standard trip current is 1.45 times the rated current. The trip time should be within 1 hour.