# Electrical Circuit Breakers – Types and Functions

**URL:** <https://forumautomation.com/t/electrical-circuit-breakers-types-and-functions/14460>\
**Category:** Electrical\
**Tags:** circuitbreaker\
**Created:** [October 1, 2026, 2:48am UTC](https://forumautomation.com/t/electrical-circuit-breakers-types-and-functions/14460 "2026-10-01T02:48:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [October 1, 2026, 2:48am UTC](https://forumautomation.com/t/electrical-circuit-breakers-types-and-functions/14460/1 "2026-10-01T02:48:12Z")

</div>

## Electrical Circuit Breakers – Types and Functions

Understanding different types of **[circuit breakers](https://forumelectrical.com/circuit-breaker-timing-test/)** is essential for electrical engineers, technicians, and maintenance professionals.

Each breaker is designed to provide specific protection based on the electrical system and application.

**[1). MCB – Miniature Circuit Breaker](https://forumelectrical.com/mcb-mccb-rccb-rcbo-elcb/)**

**[2). MCCB – Molded Case Circuit Breaker](https://forumelectrical.com/mccb-mcb-sizing-chart/)**

3). RCCB – Residual Current Circuit Breaker

4). RCCD – Residual Current Circuit Device

5). ELCB – Earth Leakage Circuit Breaker

**[6). ACB – Air Circuit Breaker](https://forumelectrical.com/explain-air-circuit-breaker-acb-and-their-working-principle/)**

**[7). VCB – Vacuum Circuit Breaker](https://forumelectrical.com/vacuum-circuit-breaker-vcb-commissioning-test-report/)**

8). DCCB – DC Circuit Breaker

9). RCBO – Residual Current Breaker with Overcurrent Protection

10). MPCB – Motor Protection Circuit Breaker

11). AFCB – Arc-Fault Circuit Breaker

12). GFCB – Ground-Fault Circuit Breaker

 ![1](https://cdn.forumautomation.com/original/2X/2/28323d3fd0517cb0fa8602a890f1613ce87a5fe2.jpeg)

## 1). MCB – Miniature Circuit Breaker

Function: Protects electrical circuits against overload and short-circuit currents.

Common use: Homes, offices, lighting circuits, and small power circuits.

## 2). MCCB – Molded Case Circuit Breaker

Function: Provides overload and short-circuit protection and is suitable for higher current ratings than MCBs.

Common use: Industrial panels, commercial buildings, and large electrical systems.

## 3). RCCB – Residual Current Circuit Breaker

Function: Detects residual or earth-leakage current and disconnects the supply to help protect against electric shock.

Important: An RCCB generally does not provide overload or short-circuit protection by itself.

## 4). RCCD – Residual Current Circuit Device

Function: Detects residual or earth-leakage current and disconnects the circuit.

Note: Terminology varies by standard and region, while RCCB is a commonly used specific type of residual-current device.

## 5). ELCB – Earth Leakage Circuit Breaker

Function: Provides protection against earth-leakage conditions.

## 6). ACB – Air Circuit Breaker

Function: Uses air as the arc-extinguishing medium and provides protection against overload, short circuit, and other faults depending on the trip unit.

Common use: Main switchboards, industrial installations, and high-current electrical systems.

## 7). VCB – Vacuum Circuit Breaker

Function: Uses a vacuum interrupter to extinguish the electrical arc.

Common use: Medium-voltage systems, substations, and industrial power distribution.

## 8). DCCB – DC Circuit Breaker

Function: Designed to interrupt direct-current circuits and fault currents.

Common use: Solar PV systems, battery systems, DC distribution, and other DC applications.

## 9). RCBO – Residual Current Breaker with Overcurrent Protection

Function: Combines residual-current, overload, and short-circuit protection in a single device.

Common use: Individual final circuits requiring comprehensive protection.

## 10). MPCB – Motor Protection Circuit Breaker

Function: Protects motors against overload, short circuit, and, depending on the device, phase-loss or phase-failure conditions.

Common use: Motor control panels and industrial machinery.

## 11). AFCB – Arc-Fault Circuit Breaker

Function: Detects potentially dangerous electrical arc faults that can contribute to electrical fires.

Common use: Residential and commercial circuits where arc-fault protection is required.

## 12). GFCB – Ground-Fault Circuit Breaker

Function: Detects current flowing through an unintended ground or earth path and disconnects the circuit.

Purpose: Helps reduce the risk of electric shock and electrical fires.