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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.

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.

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Choosing the Right B+ Type RCD

When selecting a 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 20 kHz), 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 and provide protection against DC leakage that standard RCDs may miss.

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.