RCD vs. RCBO: What’s the Difference?
When installing electrical protection in a home or commercial property, many people confuse RCDs (Residual Current Devices) and RCBOs (Residual Current Breakers with Overcurrent Protection). While both devices improve electrical safety, they serve different purposes.
✅ Quick Comparison:
| Feature | RCD (Residual Current Device) | RCBO (Residual Current Breaker with Overcurrent Protection) |
|---|---|---|
| Function | Detects leakage currents and prevents electrocution | Detects leakage, overloads, and short circuits |
| Protects Against | Electric shocks & fires caused by insulation faults | Electric shocks, overloads, and short circuits |
| Works With | Needs a separate circuit breaker for overcurrent protection | All-in-one device (RCD + circuit breaker) |
| Markings on Device | Shows rated trip current (e.g., 30mA) | Shows both trip current (30mA) and breaker rating (e.g., 16A, B/C/D curve) |
| Test Button (T) | ✅ Yes | ✅ Yes |
| Common Applications | Bathrooms, kitchens, wet areas | Full circuit protection, individual appliances |