4 Pole B-Type RCD – WEV440B-030 (40A, 30mA)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WEV440B-030 is a 4 Pole Type B RCD (40A, 30mA) designed for circuits where smooth DC or high-frequency leakage currents may be present. Unlike Type A RCDs, it detects AC, pulsed DC, and smooth DC residual currents up to 1000 Hz, ensuring safe disconnection where standard devices would fail....
The WEV440B-030 is a 4 Pole Type B RCD (40A, 30mA) designed for circuits where smooth DC or high-frequency leakage currents may be present. Unlike Type A RCDs, it detects AC, pulsed DC, and smooth DC residual currents up to 1000 Hz, ensuring safe disconnection where standard devices would fail.
Trusted in EV charging installs, heat pump systems, solar PV setups, UPS systems, and inverter-driven circuits, this RCD guarantees full 18th Edition (Amendment 2) compliance. Certified to IEC/EN 62423, it provides reliable protection for domestic, commercial, and industrial projects.
Installer Tip: Always confirm whether a Type B RCD is mandated by the equipment manufacturer. Many EV chargers and inverter-based systems will not accept Type A devices.
Key Features
- 40A, 30mA, 4 Pole Type B RCD – SKU: WEV440B-030
- Detects AC, pulsed DC, and smooth DC leakage up to 1000 Hz
- Essential for EV, solar PV, UPS, and VFD-driven systems
- Complies with IEC/EN 62423 and BS7671:2018+A2
- Rated for 230/400V AC three-phase systems
- Also available: WEV463B-030 (63A, 30mA)
Also see: Type B RCBOs for combined overload + leakage protection, or PME fault detection units for EV installs on TN-C-S supplies.
Image for illustrative purposes only.
What makes a Type B RCD different?
Type A RCDs detect AC and pulsed DC leakage. Type B RCDs extend this to cover smooth DC and higher frequencies, making them essential for EV and inverter-based systems.
Is a Type B RCD required for EV chargers?
Yes – most EV charger manufacturers specify Type B RCDs. For PME supplies, pair with a PEN fault detection unit to meet BS7671 requirements.
Can this device be used on solar PV systems?
Yes – Type B RCDs are required for inverter-driven systems such as solar PV, UPS, and variable speed drives.
What variants are available?
This range includes 40A (WEV440B-030) and 63A (WEV463B-030), both 4 Pole and 30mA sensitivity.
Does it comply with UK regs?
Yes – certified to IEC/EN 62423 and fully compliant with 18th Edition Amendment 2.
- SKU: WEV440B-030
- Type: Type B RCD
- Pole Count: 4 Pole
- Rated Current: 40A
- Sensitivity: 30mA
- Voltage Rating: 230/400V AC
- Frequency Response: Residual currents up to 1000 Hz
- Standards: IEC/EN 62423
- Variant Options: 40A (this product), 63A
Final installation must be completed by a qualified electrician. Type B RCDs are mandatory where smooth DC leakage may be present (e.g. EV chargers, solar inverters, UPS).
- Select the correct rating (40A or 63A) based on circuit demand
- Install within a suitable enclosure with correct cable management
- Confirm earth fault loop impedance values meet disconnection requirements
- Label circuits clearly for handover and inspection
