High Immunity RCBO – 20A B Curve, Type A, 30mA (WER20B-030)
The WER20B-030 is a 20A B Curve High Immunity Type A RCBO designed for residential and light commercial circuits including solar PV, battery storage,...
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Our circuit protection devices cover everything from MCBs and RCDs to modern RCBOs for domestic and commercial installations. All products are BS EN certified and compliant with the 18th Edition Wiring Regulations, giving you reliable protection against overload, short circuit and earth leakage faults.
Whether you're upgrading a consumer unit, protecting a submain, or specifying protection for new builds, we stock trade-ready breakers in a full range of current ratings and trip curves.
Quick overview: MCBs protect against overload and short circuit. RCDs protect against earth leakage. RCBOs combine both protections in one device and are now widely preferred for modern UK installs.
We stock:
All breakers are clearly labelled, UK stocked, and backed by a 2-year manufacturer warranty.
The WER20B-030 is a 20A B Curve High Immunity Type A RCBO designed for residential and light commercial circuits including solar PV, battery storage,...
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a complete 3 phase...
The WMC106B is a 6A single-pole 6kA Miniature Circuit Breaker (MCB) designed to provide reliable overcurrent and short-circuit protection on domestic and light-commercial lighting...
WSPD240KIT2 is a Type 2 surge protection device kit supplied with forked busbars and an earth lead for a faster, tidier installation. It is...
The WSPD240KIT1 is a 2-pole Type 2 Surge Protection Device supplied with pre-wired forked leads (L, N, and Earth) for quick and tidy connections....
ADR432C-30 is a 32A high immunity Type A 4 pole RCBO designed for three-phase circuits where reliable overload, short-circuit, and residual current protection are...
The WSPD240 is a 2 Pole Type 2 Surge Protection Device designed to protect 230V electrical installations from transient overvoltages caused by power surges...
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...
The WER40B-030 is a 40A B Curve High Immunity Type A RCBO designed for heavier duty residential and commercial circuits, including solar PV, battery...
The WSPD440 is a 4 Pole Type 2 Surge Protection Device designed for 230/400V three-phase + neutral systems. It helps protect electrical and electronic...
The WER32C-030 is a 32A C Curve Type A High Immunity RCBO designed for circuits with higher inrush characteristics and modern electronic loads where...
The WCED WKC Series 10kA Miniature Circuit Breakers (MCBs) are high-performance devices designed for precise overcurrent detection and short-circuit protection. Built to handle demanding...
Every installation requires correctly specified protection to comply with BS 7671 and ensure safe fault disconnection. Selecting the right device depends on load type, fault risk, and installation layout.
Miniature Circuit Breakers (MCBs) protect cables and equipment from overload and short circuit faults. Available in B, C and D curves to suit domestic circuits, commercial lighting, motor loads and higher inrush equipment.
Shop MCBs for domestic and light commercial installs.
Residual Current Devices (RCDs) disconnect supply when earth leakage is detected, protecting against electric shock and fire risk. Commonly rated at 30mA for personal protection.
For DC-sensitive applications such as EV chargers or heat pumps, see our Type B RCDs.
RCBOs combine overload, short circuit and earth leakage protection in a single device. This allows each circuit to operate independently, reducing disruption if a fault occurs.
Explore our full range of Type A RCBOs and High Immunity RCBOs.
All products are BS EN certified, UK stocked and dispatched quickly from our warehouse. We offer free next-day delivery on orders over £30 and a straightforward returns policy for trade customers.