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Protective devices

RCD vs RCBO: What Is the Difference?

An RCD is associated with residual-current protection. An RCBO combines residual-current protection with overcurrent protection for the circuit it protects.

1

RCD concept

The simplified model compares current leaving on line with current returning on neutral. A qualifying imbalance can cause the device to operate.

2

RCBO concept

An RCBO adds circuit overcurrent protection to the residual-current function, bringing two protective functions into one device.

3

Do not choose by name alone

Actual selection depends on the circuit, device characteristics, current standards, manufacturer information and the installation design.

Key ideas

RCD: residual-current protection
RCBO: residual-current plus overcurrent protection
Device selection still requires the real circuit design

Related search terms

RCD vs RCBOdifference between RCD and RCBORCBO explained

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VoltMate learning content is simplified for education and revision. It is not a substitute for current standards, manufacturer instructions, site information, competent judgement or an approved safe system of work.