Difference Between ELCB, RCCB and RCBO
For modern installations, RCBO is the best option because it combines leakage, overload, and short circuit protection in a single device while RCCB is commonly used with an MCB and ELCB is mostly obsolete technology.
| Parameter | ELCB (Earth Leakage Circuit Breaker) | RCCB (Residual Current Circuit Breaker) | RCBO (Residual Current Breaker with Overcurrent Protection) |
|---|---|---|---|
| Full Form | Earth Leakage Circuit Breaker | Residual Current Circuit Breaker | Residual Current Breaker with Overcurrent Protection |
| Main Function | Protects against earth leakage current | Protects against earth leakage and electric shock | Protects against earth leakage, electric shock, overload, and short circuit |
| Working Principle | Detects voltage on earth wire | Detects imbalance between phase and neutral current | Detects imbalance + overload/short circuit |
| Protection Type | Earth leakage only | Earth leakage only | Earth leakage + Overcurrent protection |
| Overload Protection |  No |
No |
 Yes |
| Short Circuit Protection | No |
No |
Yes |
| Electric Shock Protection | Limited | Excellent | Excellent |
| Earth Wire Requirement | Required for operation | Not mandatory | Not mandatory |
| Sensitivity | Less sensitive | Highly sensitive | Highly sensitive |
| Response Speed | Slower | Faster | Faster |
| Common Ratings | Older systems | 30mA, 100mA, 300mA | 30mA with MCB ratings (6A, 10A, 16A, 32A, etc.) |
| Usage/Application | Old electrical installations | Homes, offices, industries | Critical circuits requiring complete protection |
| Current Status | Mostly outdated | Widely used | Increasingly preferred |