4 Pole B-Type RCDs
The WCED 4 Pole Type B RCD is designed to provide advanced protection for circuits where smooth DC and high-frequency fault currents are present. Fully compliant with IEC/EN 62423, it safeguards against AC, pulsating DC, and smooth DC residual currents up to 1000 Hz – offering protection where standard Type...
The WCED 4 Pole Type B RCD is designed to provide advanced protection for circuits where smooth DC and high-frequency fault currents are present. Fully compliant with IEC/EN 62423, it safeguards against AC, pulsating DC, and smooth DC residual currents up to 1000 Hz – offering protection where standard Type A RCDs are not sufficient.
Trusted by electricians for EV charger installs, heat pump consumer units, solar PV systems, UPS setups, and other inverter-driven circuits, this device ensures full 18th Edition compliance and reliable fault disconnection. Available in 40A and 63A ratings.
- Detects and trips on AC, pulsating DC, and smooth DC residual currents
- Essential for EV chargers, UPS, solar inverters, and variable frequency drives
- Complies with IEC/EN 62423 for Type B RCDs
- Available in 40A and 63A variants
- 230/400V AC rated
Also see: RCBOs for combined overload + earth leakage protection, or PME fault detection units for EV installs on TN-C-S supplies.
Image for illustrative purposes only.
What is a Type B RCD used for?
Type B RCDs are required wherever smooth DC leakage may occur – such as EV chargers, heat pumps, solar PV inverters, UPS systems, and frequency drives. They trip safely in conditions where Type A or AC RCDs would fail.
Do I need a Type B RCD for EV chargers?
Yes – many EV charger manufacturers specifically mandate Type B RCDs to maintain compliance. For PME supplies, you may also need a PEN fault detection device to meet BS 7671 requirements.
What variants are available?
This model is supplied in 40A (WEV440B-030) and 63A (WEV463B-030) ratings, both with 30mA sensitivity. For overload + leakage protection in one device, see our Type B RCBOs.
Does this RCD comply with UK regulations?
Yes – it is fully compliant with IEC/EN 62423 and supports installations in line with the 18th Edition Wiring Regulations, including Amendment 2 requirements.
What’s the difference between Type A and Type B RCDs?
Type A RCDs detect AC and pulsed DC only. Type B covers smooth DC and high-frequency leakage, making them essential for EV, solar, and inverter-driven systems.
- Type: Type B RCD
- Pole Count: 4 Pole
- Rated Current: 40A or 63A
- Sensitivity: 30mA
- Voltage Rating: 230/400V AC
- Frequency Response: AC/DC residual currents up to 1000 Hz
- Standards: IEC/EN 62423
- Variants: WEV440B-030 (40A), WEV463B-030 (63A)
This product must be installed by a qualified electrician in line with BS 7671 (18th Edition) regulations. Type B RCDs are required where smooth DC leakage currents may be present, such as inverter-driven systems and EV chargers.
- Ensure correct selection between 40A and 63A based on circuit load
- Install in a suitable enclosure with adequate ventilation
- Check earth fault loop impedance to confirm disconnection times
- Label circuits clearly for inspection and handover
