Identification method of rated current for MCB and leakage protector

- Nov 15, 2020-

Identification method of rated current for MCB and leakage protector.

 

How to distinguish the rated current of air switch and leakage protector?

Identification method of rated current for MCB and leakage protector 1


1. Air switch, also known as air circuit breaker, is a type of circuit breaker. It is a switch that will automatically open whenever the current in the circuit exceeds the rated current. Air switch is a very important electrical appliance in low-voltage power distribution network and electric drive system. It integrates control and multiple protection functions. In addition to completing contact and breaking circuits, it can also protect short circuits, severe overloads and under voltages that occur in circuits or electrical equipment, and can also be used to start motors infrequently.

 

2.  Leakage protector, referred to as leakage protection, can be understood as "an upgraded version of the MCB", which has one more module with leakage protection function than ordinary MCBs. Not only will it trip if the current is too high, but it will also trip if it is leaking. (Leakage means that the enclosure of an electrical appliance that shouldn't be charged is electrified. It is very dangerous for people to touch it. So once there is a leakage, the power must be cut off to ensure personal safety.)

Identification method of rated current for MCB and leakage protector 2

 

3. These two products are very important in daily electrical use. So, how to distinguish the rated current of the product when selecting the MCB and leakage protection? The method is very simple, marked with "C10" means that the rated current is 10A. The same goes for missing guarantees.

 

4. The rated current of the air switch should be slightly less than the safe current carrying capacity of the wire. For example, the current carrying capacity of a 1.5mm² wire is usually 13A, which means that the wire with a current ≥ 13A may heat or even burn. Then use a C10 circuit breaker. When the current in the wire reaches 10A, the circuit breaker will trip. Theoretically ensure that the current in the wire is not If it exceeds 10A, the wire is safe.

Identification method of rated current for MCB and leakage protector 3