The Rated Capacity Of Low-voltage Pole-mounted Circuit Breakers Should Not Be Too Large.

When designing a power distribution system, the selection of the Lv Pole Mounted Circuit Breakers model must strictly consider the line load and protection requirements. If the rated current (or rated capacity) of the circuit breaker is much greater than the actual line load current, the circuit breaker may fail to trip under light or medium loads, and may not be able to respond promptly to overloads or short circuits.

The selection principle for circuit breakers typically requires that the rated current of the circuit breaker should be greater than or equal to the calculated current of the line. If the circuit breaker capacity is too high, then even if an anomaly occurs in the line, such as an overload or short circuit, when the actual load is low, its breaking mechanism may fail to operate because the tripping threshold has not been reached.

On the other hand, the circuit breaker must also have sufficient breaking capacity to cope with possible short-circuit currents. This means that the breaking capacity (interrupting capability) of the circuit breaker must cover the maximum possible short-circuit current of the system, rather than simply pursuing a high rated capacity.