Circuit Protection Devices – RCBOs, RCDs & MCBs
Explore our full range of circuit protection devices – from MCBs and RCDs to advanced RCBOs. Whether you're upgrading a board, replacing a tripped unit, or speccing out a new install, we’ve got you covered. All products are 18th Edition compliant, BS EN certified, and UK-stocked for next-day delivery.
Read more about circuit protection
Circuit protection is the foundation of every safe electrical installation. Under BS 7671 (18th Edition), all circuits must be protected against overload, short circuit, and earth leakage faults. The right device not only keeps people safe but also ensures installations pass inspection and remain insurable.
- MCBs – trip automatically when circuits are overloaded or short-circuited, replacing old-style fuses with faster, safer operation.
- RCDs – protect against earth leakage and electric shock, mandatory on most final circuits in the UK.
- RCBOs – combine the functions of MCBs and RCDs in one device, reducing nuisance trips and offering per-circuit protection.
- Type B RCDs – essential for EV, solar, and inverter-driven equipment where DC fault protection is required.
- High Immunity RCBOs – prevent false tripping in circuits with harmonics or inverter noise.
- AFDD RCBOs – detect dangerous arc faults that standard breakers miss, reducing fire risks in HMOs and rentals.
From domestic fuse board upgrades to commercial three-phase systems, our range ensures you stay compliant with Amendment 2 while keeping installs efficient and reliable. Every device is labelled, tested, and backed by a manufacturer warranty for peace of mind.
RCD Upgrade Unit – 80A 2 Module with Seal Screws (WECRC80)
£16.65
The WECRC80 is a high-capacity RCD upgrade unit pre-fitted with an 80A 30mA RCD inside a 2-module plastic enclosure. It’s designed for installations where the main consumer unit lacks RCD protection, or where standalone fault protection is needed for larger circuits and sub-mains. With an...
RCD Upgrade Unit – 63A 2 Module with Seal Screws (WECRC63)
£20.88
The WECRC63 is a compact RCD upgrade unit fitted with a 63A 30mA RCD inside a 2-module plastic enclosure. Designed for situations where the existing consumer unit lacks integrated RCD protection, it delivers dependable earth leakage fault protection without needing a full board replacement. With...
PME Fault Detection Consumer Unit – 4 Pole 63A RCBO with SPD, Load Balancing & kWh Meter (WMEPME12/LBK)
£167.10
The WMEPME12/LBK PME Fault Detection Consumer Unit is the largest model in the range, a 12-module steel enclosure combining a 4 Pole 63A Type A RCBO, Type 2 SPD, PME load balancing relay, and an integrated kWh meter. It provides full PEN fault detection, surge...
Main Switch Consumer Unit – WME22/MS100 (22 Module, 100A)
£49.75
The WME22/MS100 Main Switch Consumer Unit is the largest in the range — a 22-module metal enclosure with a 100A main switch incomer. With 20 usable ways, it provides maximum capacity for full domestic rewires, HMOs, or small commercial installations. Built in powder-coated steel and...
Main Switch Consumer Unit – WME18/MS100 (18 Module, 100A)
£43.90
The WME18/MS100 Main Switch Consumer Unit is a 18-module metal enclosure supplied with a 100A main switch incomer. Offering 16 usable ways, it’s ideal for large domestic properties, HMOs, or small commercial sites with multiple circuits to manage. Built in durable powder-coated steel with raised...
What Are Circuit Protection Devices?
Every installation needs the right circuit protection to keep people and property safe. Under the 18th Edition Wiring Regulations, devices such as MCBs, RCDs, and RCBOs each play a specific role in protecting circuits against overload, short circuits, and earth leakage faults.
Main Device Types
- MCBs – trip on overload or short circuit to protect wiring.
- RCDs – disconnect supply when earth leakage is detected, reducing electric shock risk.
- RCBOs – combine MCB and RCD functions in one device, now standard for new installs.
- High Immunity RCBOs – designed to resist false tripping in EV, solar, and UPS circuits.
- Type B RCDs – DC-sensitive protection for EV chargers, heat pumps, and renewables.
- AFDD RCBOs – detect dangerous arc faults that standard devices can’t, recommended in HMOs and rental properties.
Compliance & Standards
All devices in this category are BS EN certified and meet the requirements of the 18th Edition Amendment 2. Selecting the correct protection ensures installations pass inspection, remain insurable, and safeguard against electrical hazards.
Applications
- Domestic boards – RCBOs and RCDs are standard for new builds and upgrades.
- Commercial installs – C-curve MCBs, three-phase RCBOs, and selective RCDs for grouped circuits.
- EV & renewable systems – Type B RCDs, high immunity RCBOs, and SPDs are strongly recommended.
Why Buy From Power & Data UK?
We stock the full spectrum of circuit protection devices, all with next-day delivery, hassle-free returns, and full manufacturer warranties. Every breaker is clearly labelled and tested for professional use, giving installers confidence on every job.