B+ Type RCDs
B+ Type RCDs provide specialist protection for heat pumps, EV chargers, and solar inverters where standard Type A or AC RCDs are not suitable. Built to IEC 62423, they detect smooth DC and high-frequency leakage currents to ensure safe disconnection in demanding applications.
Our compact 2-module units are installer-friendly, compatible with leading heat pump brands including Vaillant, and supplied from UK stock with next-day delivery available.
Read more about B+ Type RCDs
B+ devices are an advanced form of Type B RCD, designed to offer additional sensitivity to high-frequency and smooth DC currents that can occur in inverter-driven systems. This makes them a crucial upgrade for many renewable and EV installations.
Typical uses include:
- Heat pump systems – e.g. Vaillant, Mitsubishi, Daikin
- Solar PV & battery storage
- EV charging points
- Industrial UPS & frequency converters
All units are compliant with the 18th Edition wiring regulations and backed by manufacturer warranty.
Heat Pump RCD -B Type 2 Pole - WHP240-030
£136.30
The WHP240-030 is a compact Type B RCD specifically designed for heat pump systems – including Vaillant and other inverter-driven installs where full DC fault protection is required. Unlike Type A or Type AC RCDs, this 2 pole device is engineered to detect smooth DC...
Choosing the Right B+ Type RCD
When selecting an B+ Type RCD, always check the equipment manufacturer’s recommendations. Many heat pump systems and EV chargers specifically call for B or B+ protection to ensure safety under DC leakage conditions. Using the wrong RCD type risks nuisance tripping or, worse, failure to disconnect under fault conditions.
Key points for installers:
- Trip sensitivity: 30mA for personal protection; 100mA for discrimination in upstream installs.
- Compatibility: Required for >solar PV, heat pumps, and other inverter-driven systems.
- Form factor: Compact 2-module design saves space in crowded enclosures.
- Standards: Fully compliant with IEC 62423 and 18th Edition wiring regulations.
All products are stocked in the UK and available for next-day delivery. For added peace of mind, every device is backed by a manufacturer warranty and supported by our returns policy.
FAQs – B+ Type RCDs
What is the difference between a Type B and B+ RCD?
Type B RCDs detect AC, pulsating DC, and smooth DC residual currents. B+ Type RCDs extend this with improved high-frequency fault detection (up to 20kHz), which is critical for modern heat pumps and inverter systems.
Do I need a B+ Type RCD for a heat pump?
Yes, many inverter-driven heat pumps require a B+ Type RCD to meet manufacturer specifications. This ensures proper protection against DC leakage that standard RCDs may not detect.
Are B+ Type RCDs compliant with the 18th Edition?
Yes, all our B+ Type RCDs are built to IEC 62423 standards and fully compliant with BS 7671 (18th Edition) wiring regulations.
Where are B+ Type RCDs typically installed?
They’re most often used in EV charging installations, solar PV systems, and heat pump circuits - anywhere with inverter-based equipment that can produce DC residual currents.