If you are looking to add circuit breakers to your home, you have probably encountered these two acronyms MCB and RCCB. These stand for Miniature Circuit Breaker (MCB) and Residual Current Circuit Breaker (RCCB). Here I will explain the difference between them, with examples for each type of device.
Before understanding the difference, it is necessary to understand the power supply to your home, as well as its consumption.
The components that make up a housing circuit are the wires, switches, fuses, breakers, sockets, and other devices that run on electricity. The main purpose of circuit breakers is to protect against irregular current flow.
These circuit breakers perform the vital role of breaking the circuit to prevent damage from excessive current due to short circuit or overload.
When a short circuit occurs, a large amount of current begins to flow causing the MCB to trip almost immediately. In the event of an overload, it takes a few seconds to trip and interrupt the circuit.
Overloading and short circuits in the power supply can be dangerous for both people and equipment. To minimize these risks, MCBs are installed.
It is a current-operated safety device that breaks the circuit when current leaks are detected, thus ensuring protection against electric shock.
Current leakages mainly happen when the current flowing in the circuit gets branched by a person who has direct or indirect contact with the current-carrying conductor. An MCB cannot detect these irregularities, whereas it can be easily detected by the RCCB.
A major advantage of RCCB is that it can control unbalanced electric current almost instantaneously, taking only 20 milliseconds to trip.
The main difference between MCB and RCCB is that MCB is used to prevent short circuits & overload protection and RCCB prevents earth leakage.
Earth Fault Protection
Short Circuit Protection
No. Of Poles Available
2 for Single Phase
4 for Three Phase
Fuse Alternative, Protective Circuit, Local Control Switch
Direct & Indirect Contact Protection, Prevent Electrical Failures
Cannot Be Checked
Working Condition Can Be Checked Using ‘T’ Button