WAR Series A‑Type B‑Curve 30 mA Single-Module AFDD/RCBO
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WCED WFD Series – A-Type AFDD RCBO
The WAR Series A-Type B-Curve 30 mA AFDD modules provide arc fault, overload, and residual current protection in a single compact module. Designed for residential, commercial, and light industrial applications, these units help prevent electrical fires caused by arc faults while protecting circuits with B-curve overcurrent characteristics.
DIN-rail mountable and fully compliant with UK wiring regulations and BS EN 62606, these devices are ideal for circuits where enhanced fire detection and leakage protection is required. High-spec, installer-friendly AFDD modules with compact single-module design.
Key Features
Applications
HMOs and rental properties
Mandatory under BS 7671 Amendment 2 (March 2022) for socket circuits ≤32A in Houses in Multiple Occupation, care homes, and purpose-built student accommodation.
View WCED range →Residential and commercial circuits
Suitable for all standard final circuits in new builds, consumer unit upgrades, and rewire projects where enhanced fire protection is required or specified.
View distribution boards →EV charging circuits
Provides arc fault protection on EV supply circuits — particularly useful for garage and outbuilding installations where cable routing creates higher arc risk.
View EV protection →Workshops and light industrial
For workshops, commercial units, and light industrial premises where wiring is subject to mechanical damage, aging, or higher arc fault risk.
View WCED range →How it works
A standard RCBO protects against overloads, short circuits, and earth leakage. The WCED WFD Series adds a fourth layer: continuous waveform monitoring using an integrated microprocessor that analyses the current signature on the circuit and detects the characteristic patterns of dangerous electrical arcing.
| Fault type | Cause | Detected by MCB/RCD alone? | Detected by AFDD RCBO? |
|---|---|---|---|
| Series arc fault | Loose terminal, broken conductor, rodent damage | ❌ No | ✅ Yes |
| Parallel arc fault | Damaged insulation, pinched or crushed cable | ⚠️ Only if current exceeds trip threshold | ✅ Yes |
| Earth leakage (30 mA) | Faulty equipment, wiring fault to earth | ✅ Yes (RCBO/RCD) | ✅ Yes |
| Overload / short circuit | Excess current draw, dead short | ✅ Yes (MCB/RCBO) | ✅ Yes |
Specifications
| Output | 6A, 10A, 16A, 20A, 32A, 40A |
|---|---|
| Trip curve | B Curve (3–5× In) |
| RCD type | Type A — AC and pulsating DC (up to 6 mA) |
| RCD sensitivity | 30 mA |
| Breaking capacity | 6 kA (Icn) |
| Poles | 1P+N (switched — Line and Neutral) |
| Module width | 17.8 mm (1 module) |
| Dimensions | 90 × 17.8 × 77 mm |
| Mounting | 35 mm DIN rail |
| IP rating | IP20 — indoor use only |
| Voltage | 230V AC, 50/60 Hz |
| Arc detection | Series and parallel arc faults |
| Self-test | Automatic periodic self-test per BS EN 62606 |
| Fault indicator | LED blink-code diagnostics |
| Standard | BS EN 62606, IEC 61009-1, BS 7671:2018 |
| Compliance | UKCA marked |
| Origin | WCED (Whitecliffe Electrical) |
Part numbers
| Part code | Rating | Curve | RCD type | Typical application |
|---|---|---|---|---|
| WFD106B-030 | 6A | B | Type A 30mA | Lighting circuits |
| WFD110B-030 | 10A | B | Type A 30mA | Low-load lighting circuits |
| WFD116B-030 | 16A | B | Type A 30mA | Ring and radial socket circuits — most common |
| WFD120B-030 | 20A | B | Type A 30mA | Dedicated appliance circuits |
| WFD132B-030 | 32A | B | Type A 30mA | Ring mains, EV charging, cookers |
| WFD140B-030 | 40A | B | Type A 30mA | High-load and shower circuits |
Installation notes
Indoor use only (IP20). DIN-rail mountable — fits any standard consumer unit or distribution board that accepts a single-module RCBO. Must be installed by a qualified electrician. Ensure the correct current rating is selected for each individual circuit. The flying neutral cable can be cut to suit installation depth. The Line and Neutral conductors do not need to be disconnected for IR testing when the lever is in the OFF position.
Frequently Asked Questions
What is an AFDD and what does it protect against?
An AFDD (Arc Fault Detection Device) detects dangerous electrical arcing caused by loose connections, damaged cable insulation, or crushed wires — faults that generate intense heat and can cause fires without tripping a standard MCB or RCD. The WFD Series adds arc fault detection on top of a full RCBO, giving four layers of protection in a single module.
What is the difference between the Plus Tethered and Basic Tethered?
Both have a permanently attached 6.8 or 9.6 m Type 2 cable. The Plus adds solar charging compatibility, built-in energy monitoring, and dynamic load management via the Wireless Energy Manager. If you have solar panels, choose the Plus.
Are AFDDs mandatory in the UK?
Since March 2022, AFDDs are mandatory under BS 7671:2018 Amendment 2 for socket circuits rated ≤32A in the following building types:
- Houses in Multiple Occupation (HMOs)
- Higher Risk Residential Buildings (HRRBs) — over 18m or 6+ storeys
- Purpose-built student accommodation
- Care homes
They are strongly recommended for all other domestic and commercial installations as fire-risk best practice.
Will this fit in my existing consumer unit?
Yes. The WFD Series is 17.8 mm wide (one module) and is a direct drop-in replacement for any single-module RCBO in a standard consumer unit. No board change required. Compatible with all standard DIN-rail consumer units.
What is the difference between a Type A and Type B AFDD RCBO?
Type A (WFD Series) detects AC residual currents and pulsating DC up to 6 mA — suitable for the majority of domestic circuits and most EV chargers. Type B additionally detects smooth DC residual currents and is required for some 3-phase EV chargers. For most residential and commercial final circuits, Type A is the correct specification.
What is a B-curve and when should I use it?
B-curve MCBs trip at 3–5× the rated current. They are the correct choice for resistive loads — lighting circuits, socket circuits, and general domestic wiring. C-curve devices (5–10×) are used for inductive loads with high start-up currents such as motors and compressors. B-curve is correct for the vast majority of residential and commercial final circuits.
Can an AFDD cause nuisance tripping?
The WFD Series uses high-immunity filtering to distinguish genuine arc fault signatures from normal equipment switching and load noise. Nuisance tripping is uncommon in correctly installed circuits. The LED blink-code indicator on the device identifies the cause of any trip, making fault diagnosis straightforward.
How do I test the device after installation?
Press the integral test button with the circuit energised — the device should trip immediately. Reset by switching the lever to ON. The arc fault detection element performs automatic periodic self-tests internally to BS EN 62606. No additional test tool is required for routine testing.
Is this suitable for EV charging circuits?
Yes — the WFD Series is suitable for EV supply circuits where Type A RCD protection is specified. For EV chargers that explicitly require Type B RCD protection (typically 3-phase units without integrated DC protection), a Type B RCBO or RCD should be used instead. Check your charger manufacturer's documentation for the required RCD type.
