RCCBs and RCBOs both provide residual-current protection, but they do not offer exactly the same functions. Understanding the difference is essential for safe circuit design.
| Feature | RCCB | RCBO |
|---|---|---|
| Earth-leakage protection | Yes | Yes |
| Overload protection | No | Yes |
| Short-circuit protection | No | Yes |
| Requires separate MCB | Usually yes | No |
| Typical use | Group protection | Individual circuit protection |
What is an RCCB?
An RCCB monitors the current flowing through live and neutral conductors. If an imbalance indicates leakage to earth, it disconnects the supply. It must normally be used with an MCB or other overcurrent protective device.
What is an RCBO?
An RCBO combines residual-current protection with overload and short-circuit protection in one unit. It is commonly used where individual circuit protection and better fault isolation are required.
When to choose an RCCB
- Several circuits are grouped under one leakage-protection device.
- Cost and panel arrangement favour shared protection.
- Separate MCBs already provide overcurrent protection.
When to choose an RCBO
- Critical circuits need independent protection.
- You want to avoid one leakage fault disconnecting multiple circuits.
- Panel space and simplified wiring support combined protection.
Important ratings
Check rated current, residual operating current such as 30mA or 100mA, number of poles, type of residual-current detection and breaking capacity for RCBOs. Product selection must follow local electrical regulations and the system design.
Frequently asked questions
Is RCCB enough without an MCB?
No. An RCCB does not normally protect against overload or short circuits.
Why does an RCCB trip?
Common reasons include insulation leakage, faulty appliances, moisture, neutral-earth faults and cumulative leakage from multiple devices.
Which is better for a home?
Both can be appropriate. RCBOs provide better circuit-level isolation, while RCCBs may be more economical for grouped circuits.
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