How does an earth leakage circuit breaker work?

Our earth leakage circuit breaker is generally composed of a ZCT (Zero-phase-sequence Current Transformer) + Earth leakage relay + Circuit breaker. The ZCT detects earth leakage current, notifies the electronic circuit, and shuts off the circuit using an internal tripping device.

Can an earth leakage circuit breaker cause a fire?

A leakage current of 100 mA or more can cause a fire. An earth leakage circuit breaker detects earth leakage of approximately 15 to 30 mA, and immediately shuts off the circuit within 0.1 seconds, preventing an accident.

What is an Earth Leakage Circuit Breaker (ELCB)?

An Earth Leakage Circuit Breaker (ELCB) is a device that detects and interrupts the flow of electric current to the earth. Initially, ELCBs were voltage detection devices, but they have been switched to current sensing devices, which are now known as Residual Current Circuit Breakers (RCCBs) or Residual Current Devices (RCDs).

When do you need an earth leakage circuit breaker?

As shown in the figure below, in cases such as when an electrical device is used in a location where there is humidity or moisture, or when a portable motor-driven appliance is used in a location of high conductivity such as an iron plate or iron frame, an earth leakage circuit breaker is necessary.

What is earth leakage in electrical circuits?

Earth leakage in electrical circuits refers to the electrical current that flows from the live conductor to the earth through an unintended path. This can occur due to poor insulation or when a person's body becomes part of the circuit, potentially causing electrical shock.