What is difference between MCB, MCCB, ELCB, RCCB, RCD, RCBO

The main is deference MCB, MCCB, ELCB, RCCB, RCD, RCBO are using for low current up to 125 Amps, and MCCB using for high current up to 1000 Amps. It is using home and industrial purpose for protection against Human hazards and electrical appliances damage. mcb, mccb, elcb, rccb, rcd, rcbo meaning explained and using are mentioned below in this page.

MCB – means Miniature Circuit Breaker.

MCB protecting the electrical types of equipment from over current and short circuit faults.

What is difference between MCB, MCCB, ELCB, RCCB, RCD, RCBO

MCCB – means Molded Case Circuit Breaker.
The MCCB is sensing the temperature, current an electromagnetic device. Both device function acts mechanically trip on the mechanism. This is depending upon the equipment protection. The MCCB will use one or a combination of different type of tripping elements are there. That protects against the below following conditions;
• Thermal overload
• Ground faults

• Short circuits

ELCB– means Earth Leakage Circuit Breaker.

ELCB is normally sensing of leakage current with earth, recommended ‘ma’ (Millie amps) in the Neutral and Phase. It is protecting electrical devices.

RCCB – means Residual Current Circuit Breaker.
 The RCCB is normally sensing imbalanced power Supply in Neutral and Phase. RCCB is an electrical wiring devise for equipment disconnected is a circuit whenever detects that the supply is not balanced in between phases and neutral (power fluctuations).

RCD – means Residual Current Device.

RCD is normally sensing imbalanced power Supply, Neutral, and Phase.
• Check compatibility with earth system.
RCD should be connected to the effective earth (ground).

RCBO – means Residual Current Breaker with overcurrent protection.
Install this product in accordance with national wiring regulations.

Check compatibility with earth system. It should be effectively earthed.

What is difference between MCB, MCCB, ELCB, RCCB, RCD, RCBO

Warning: Do not use this product (RCBO) which requires Double Pole switching e.g. Air conditions, IT systems. It is normally used for switched sockets.
Failure to follow these instructions the result will be death or serious injury.

• Install the neutral cable (Black) strait between the RCBO and the DB main neutral block
• The white wire is connected to in DB earth block
• Phase wire is connected to L inform the DB
• The device is connected to Nout (Neutral out)and Lout(Line out)


• These devices should be tested periodically (Monthly ones) by pressing on the button marked “T” (Test) it is prevented to damage the equipment’s (devices).
I explained the best in my knowledge about ‘what is the difference between mcb, mccb, elcb, rccb, rcd, rcbo.’ If you have any queries about this matter Please comment me.

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