Difference between an earth leakage circuit breaker and an earth leakage protector?

Although the leakage protector and the leakage circuit breaker function is similar, but they use the protection mode and the way to cut off the circuit but there are obvious differences.

1. Different protection methods

Leakage protector protection is based on the "zero sequence method" principle. It can detect the human current through the "zero sequence current", once detected greater than the set value of the leakage current, it will cut off the power supply, so as to achieve the purpose of protecting personal safety and electrical equipment.

Leakage circuit breaker protection is based on the "current differential method" principle. It detects the difference between the current in and out of the circuit, and once the difference is detected to be greater than the set value, it will immediately cut off the circuit to achieve the purpose of protecting personal safety and electrical equipment.

2. Different cutting methods

Leakage protector cut off the way is to disconnect the circuit, so as to achieve the purpose of protecting people and equipment.

Leakage circuit breaker can not only disconnect the circuit, but also overload and short-circuit cut off to avoid electrical equipment overload, short-circuit triggered fire and other safety incidents.

Summary:

Earth leakage protector only has the effect of leakage tripping, mainly used as a low-voltage power grid electrocution protection, but also when the three-phase equipment phase protection, it is divided into single-phase and three-phase, and the rated current is relatively small, and can be used directly in electrical appliances. The leakage circuit breaker in addition to leakage tripping role, there are overcurrent tripping function, leakage, short circuit and overload have a protective effect. In addition, its rated current is relatively large, applicable to the whole line protection.