As an overload protection device in the distribution system, the air switch itself plays the role of overcurrent protection, that is, when the current in the circuit exceeds the protection threshold of open circuit, the air switch automatically trips to cut off the circuit to prevent accidents. Therefore, the choice of air switch should be based on your actual electricity demand and the load capacity of the distribution system. If your distribution system itself can't bear such a big load, blindly replace a bigger gap, and the protection device can't act in time when the line is overloaded, which will burn out the distribution system and cause a fire.

The rated current of four 1.5 air conditioners is about 5A×4=20A, and that of three/kloc-0 air conditioners is about 4a× 3 = 1 2a. However, air conditioning is an inductive load, and the starting current is huge. Therefore, if the above values are doubled, the single current carrying capacity of the air conditioning circuit should not be less than 64A. The combined current of refrigerator, color TV and lighting is almost 10A, so the total current at full load is about 74A, and the model of 80A is needed for no-load operation. However, these are all based on the fact that your distribution line can withstand such a large current, otherwise it will only increase the air gap without replacing the line, and these air conditioners are on at the same time, just wait and see the wires smoke.

Generally speaking, the main switch does not use open circuit with leakage protection function. Leakage protectors are generally used in ordinary socket circuits and socket circuits that need special power supply lines (such as air conditioning lines), which is necessary, but the main switch is generally not used.