The WFD120B-030 is a 20A, B Curve Arc Fault Detection (AFDD) RCBO, combining arc fault detection, 30mA Type A residual current protection, short-circuit, and overload protection in a single compact unit. Fully compliant with BS 7671:2018 (18th Edition), it provides advanced fire prevention for modern electrical systems.

Unlike conventional RCBOs, this AFDD RCBO includes a microprocessor-based detection system that identifies arc faults caused by damaged conductors, loose connections, or faulty appliances. Once detected, the device trips instantly and isolates both live and neutral poles, ensuring maximum safety.

Protective Coverage

The WFD120B-030 combines the functionality of:

• Arc Fault Detection – protects against series and parallel faults
• Residual Current Protection – Type A, 30mA (AC and pulsed DC leakage)
• Overcurrent Protection – short-circuit and overload
• Overvoltage Protection – trips at 275V ±5%

Variant Comparison