< img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=3084171375204212&ev=PageView&noscript=1"/>
Whatsapp Icon Searches
Up Icon

Understanding Earth Leakage Circuit Breaker (ELCB)

2023/05/17 丨Technical

The use of electricity has become an integral part of people's daily life. If the electrical system is not properly designed, installed, and maintained, it may cause electric shock or fire. To avoid such hazards, one of the devices that help maintain electrical safety is ELCB. We'll take a look at how ELCBs work, their benefits, and how they can help maintain electrical safety.


What is an Earth-leakage Circuit Breaker?


Earth-leakage circuit breakers are safety devices that detect and prevent leakage current from flowing through a circuit. ELCBs are used in electrical systems with high ground impedance to prevent electric shock. It works by detecting any leakage current from the ground. When the leakage current exceeds a certain threshold, the power to the circuit is quickly cut off to prevent anyone from being exposed to a shock hazard.


ELCBs are commonly used in residential and industrial electrical systems and are often required by electrical safety codes. They are usually installed in the main electrical panel or cabinet, where they monitor the flow of current through all circuits in the building. When the ELCB detects a fault, it trips and cuts off power to the affected circuit to prevent further damage or injury.


How does an ELCB Work?


ELCBs operate by monitoring the current flowing through the circuit. If the current flowing through has an imbalance that exceeds the threshold, the ELCB assumes there is a leakage and shuts off the current. This imbalance may be caused by equipment malfunctions, wiring problems, or some other leak in the circuit that could prove dangerous. The ELCB detects this leakage current and triggers a mechanism to interrupt the flow of electricity to prevent electric shocks and fires.


Types of Earth-leakage Circuit Breakers


The types of earth leakage circuit breakers are mainly voltage operated and current-operated. Voltage-operated ELCBs use voltage transformers to detect a voltage difference between the source and return conductors. When the voltage exceeds a certain threshold, the ELCB trips and interrupts the power supply. In contrast, current-operated ELCBs use current transformers to detect an imbalance between the current flowing into the circuit and the current flowing out of it. If the current is unbalanced, the ELCB trips and interrupts the power supply. CO-ELCB is more accurate and reliable than VO-ELCB in detecting leakage currents. They also provide better protection against shock and fire hazards.


ELCBs are often used in combination with other safety devices such as residual current circuit breakers (RCCBs) and ground fault circuit interrupters (GFCIs). RCCBs are similar to ELCBs, but are more sensitive and can detect even small imbalances in current flow. GFCIs, on the other hand, are designed to prevent electric shock by quickly shutting off power when a change in current flow to the ground is detected.


Benefits of ELCBs


Anti-Electric Shock: ELCBs protect people from potentially fatal electric shocks by detecting leakage currents and interrupting the power supply.


Reduced Risk of Fire: ELCBs minimize this risk by interrupting the power supply in the event of a ground fault.


Equipment Protection: ELCB can prevent damage to electrical equipment and devices by interrupting the power supply in the event of a fault.


Increased Safety: ELCBs contribute to the overall electrical safety of homes, offices, and industrial facilities by monitoring circuits.




All in all, ELCBs are an essential part of electrical safety in residential, commercial, and industrial applications. An earth leakage circuit breaker is installed to improve safety and reliability. As well as ELCB is available in two types ELCB has advantages, including ease of installation and cost efficiency, and is an effective solution for electrical safety in a variety of applications.

Copyright © Shanghai Matis Electric Co.Ltd沪ICP备09024882号-1
Input password