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)?

The earth leakage circuit breaker (ELCB) is used to protect persons against electric shock hazards and to prevent a fire. This also have the same function as MCCB. This kind of breaker is ELCB rated 225 Amp and less, and is available to protect a motor and the associated wiring or conductors.

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 are earth leakage protection devices?

Earth leakage protection devices are crucial for electrical safety, preventing electric shocks and fires caused by faulty wiring or insulation failures. Three common devices used for this purpose are Earth Leakage Circuit Breakers (ELCBs), Residual Current Devices (RCDs), and Residual Current Circuit Breakers with Overcurrent Protection (RCBOs).