The WFD140B-030 is a 40A, B Curve Arc Fault Detection (AFDD) RCBO, designed to deliver maximum protection against arc faults, earth leakage, overload, and short circuits in one compact unit. Built to BS 7671:2018 (18th Edition) standards, it provides fire-safe reliability for high-load domestic and commercial circuits.

Unlike a standard RCBO, this device features microprocessor-driven arc fault detection that constantly monitors electrical waveforms. It trips instantly when dangerous arcs occur due to damaged insulation, loose terminals, or faulty appliances. Both live and neutral poles are isolated for complete safety.

Protective Coverage

This AFDD RCBO combines:

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

Variant Comparison