Firstly, it is necessary to understand the selection principle of low-voltage circuit breakers, which must meet the requirement that the rated current of the release must be greater than (or equal to) the calculated working current of its installation circuit.

If it is a distribution main circuit, the rated release should be ≥ the calculated working current of the distribution circuit.

If it is an electric motor circuit, the rated current of the release must be ≥ K x the starting current of the circuit. K is the reliability coefficient. The reliability coefficient of K value is taken as 1.3. (The K value also varies depending on the switch category. For example, DW type takes 1.35, DZ type takes 1.7).

The circuit breaker should also match the safe current carrying capacity of the wire and the rated current of the fuse melt, both of which are indispensable. Therefore, circuit breakers operate safely at a rated current of ≤ 20% in actual operation. It cannot run at full load at all.

The safety current carrying capacity of the corresponding control wire of the 63A circuit breaker is 10mm ² (current 77A) when laid in an open wire. Laying 16mm2 (two core 71A), (three core, four core 64A) through conduit.

Therefore, the low voltage switch of 63A can only operate safely at a maximum load current of around 50A. The analysis of the electrical power that can be carried under different rated voltages is as follows:

One. Single phase 220V:

Resistive and lighting loads can carry a load of about 11KW calculated at 4.5A per KW.

Inductive load motors and air conditioning loads can carry a load of about 6KW calculated at 8A per KW.

Two. Two phase 380V:

Generally, industrial appliances can carry a load of about 18KW calculated at 2.7A per KW

Three. Three phase 380V:

Generally used in three-phase motors, the maximum load that can be carried is 15KW calculated at 2A per KW (DZ type switch). Or up to 18KW (DW type switch).

Four. Three phase four wire 380V/220V:

The three-phase four wire 380V/220V hybrid power can carry a load of 30KW to 33KW calculated at 1.5A per KW.

The above is about Weikewei Technology's 63断路器How much current can it withstand? If you have a demand for 63 circuit breakers, you can also directly contact Weikewei customer service, and we will definitely provide you with cost-effective 63 circuit breakers.