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Residual Current Breakers with Overcurrent Protection (RCBO)
These one module RCBOs are a combination of a Miniature Circuit Breaker (MCB) and a Residual Current Device (RCD). This protects the individual circuit from both overload and earth fault.
RCBOs are considered a better way of providing circuit protection while reducing the possibility of nuisance tripping in accordance with the wiring regulations.
The neutral supply (blue) and earth supply (white/cream) are provided via flying leads.