Table of Contents
Circuit breakers are essential safety electrical devices. RCBO and RCCB are two common types of circuit breakers that monitor the current flow and provide protection for devices, circuits, and human bodies. However, the differences between them remain obscure to many. Therefore, this guide will clarify the differences between RCBO and RCCB so that you can pick the right one for your needs.
What is a Residual Current Circuit Breaker (RCCB)?
Working Principle of RCCB
Main Function of RCCB
Types of RCCB
- 2 Pole: It is used for single-phase circuits and connects one live wire and one neutral wire.
- 4 Pole: It is used for three-phase circuits and connects three live wires and one neutral wire.
- Type AC: It responds to only alternating currents (AC).
- Type A: It responds to both AC and pulsating direct currents (DC).
- Type F: It responds to AC, high-frequency AC, and pulsating DC.
- Type B: It responds to AC, high-frequency AC, pulsating DC, and smooth DC currents.
What is a Residual Current-operated Circuit Breaker (RCBO)?
Working Principle of RCBO
Main Functions of RCBO
- Protection from earth fault currents
- Protection from overcurrent due to overloading
- Protection from short circuit currents
RCBO vs RCCB: Key Differences
Conclusion
RCBO and RCCB are two popular circuit breakers used in wide applications. As evident from the above thorough RCBO vs RCCB comparison, an RCBO provides protection from earth fault (residual current) and overcurrent while an RCCB protects from earth leakage only. However, the selection of circuit breakers should not be simply based on functionality, but on budget, existing systems, etc.