Arc Fault Detection A-Type RCBO – WFD110B-030 (10A, B Curve, 30mA)

The WFD110B-030 is a 10A, B Curve Arc Fault Detection (AFDD) RCBO, combining arc fault detection, residual current protection (30mA), short-circuit, and overload protection in one compact device. Built to BS 7671:2018 (18th Edition) standards, it delivers advanced fire prevention for modern electrical systems.

Unlike a standard RCBO, this device features microprocessor-based arc fault detection, continuously monitoring the electrical waveform for dangerous arc signals caused by worn wiring, poor connections, ageing circuits, or faulty appliances. When detected, it trips instantly, cutting both live and neutral conductors to eliminate fire hazards.

Protective Coverage

This AFDD RCBO combines:

• Arc fault detection – series and parallel
• Residual current protection – Type A (30mA, AC + pulsed DC)
• Short-circuit and overload protection
• Overvoltage protection – trips at 275V ±5%

Variant Comparison

• SKU: WFD110B-030
• Type: AFDD + Type A RCBO
• Rating: 10A
• Curve: B
• Residual Current Sensitivity: 30mA
• Breaking Capacity: 6kA
• Operating Voltage: 230V AC, 50Hz
• Arc Fault Detection: Series & Parallel
• Additional Protection: Overload, short circuit, leakage, overvoltage (275V ±5%)
• Isolation: Disconnects live & neutral (switched neutral)
• Mounting: 1 module DIN rail
• Dimensions: 17.8 × 116 × 76 mm
• Compliance: BS EN 61009-1, BS EN 62606, BS 7671:2018 (18th Edition)

Installation must be carried out by a qualified electrician in line with BS 7671. AFDD RCBOs are recommended for high fire-risk circuits, particularly in sleeping accommodation and HMOs.

• Use the 10A version for socket and mixed-use circuits
• For single-phase 230V AC circuits only
• DIN rail mounted, 1 module (17.8mm wide)
• Not suitable for DC systems
• Compatible with WCED consumer units and boards

What is the 10A AFDD RCBO used for?

It’s typically used for socket and small appliance circuits in HMOs, rentals, and commercial premises where fire safety is critical.

Is this device compliant with UK regulations?

Yes – fully compliant with BS 7671:2018+A2 and certified to BS EN standards for AFDDs and RCBOs.

Does it disconnect both live and neutral?

Yes – the switched neutral design provides full isolation of the circuit.

What’s the main benefit of an AFDD over a standard RCBO?

It detects dangerous arc faults caused by poor wiring, ageing conductors, or faulty appliances – something standard RCBOs cannot do.

What other ratings are available?

The WFD1 series includes 6A, 16A, 20A, 32A, and 40A models. This page is for the 10A WFD110B-030.