Circuit Protection Devices - MCBs, RCDs & RCBOs
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.
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We stock:
- B, C & D curve MCBs – matched to load type and inrush characteristics
- Type A & Type B RCDs – including DC-sensitive protection for renewables
- RCBOs in multiple ratings – individual circuit protection aligned with best practice
- High Immunity RCBOs – designed to reduce nuisance tripping on EV and inverter circuits
All breakers are clearly labelled, UK stocked, and backed by a 2-year manufacturer warranty.
40A 4 Pole 10kA MCB C Curve – WKC440C
£15.05
The WKC440C is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its C Curve trip profile, it is built for inductive load circuits such as motors, pumps, HVAC systems, EV chargers, and commercial lighting in three-phase boards,...
10A 4 Pole 10kA MCB C Curve – WKC410C
£15.05
The WKC410C is a 10A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral systems. With a C Curve trip characteristic, it is ideal for inductive load applications such as small motors, HVAC equipment, and EV charger sub-circuits in commercial three-phase boards,...
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)
£177.85
The WMEPME12/LBK PME Fault Detection Consumer Unit is the largest model in the range, a 12-module steel enclosure combining a 2 Pole 40A or 63A Type A RCBO, B or C Curve, Type 2 SPD, PME load balancing relay, and an integrated kWh meter. It...
Main Switch Consumer Unit – WME22/MS100 (22 Module, 100A)
£52.95
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...
Choosing the Right Circuit Protection
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.
MCBs – Overcurrent Protection
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.
RCDs – Earth Leakage Protection
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 – Combined Protection Per Circuit
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.
Key Specification Considerations
- Trip curve: B-curve for domestic, C-curve for mixed commercial, D-curve for high inrush loads.
- Current rating: Match to cable size and design current to avoid nuisance tripping.
- Type A vs Type B: Type A is standard for modern electronics; Type B required where smooth DC leakage may occur.
- Breaking capacity: Ensure kA rating matches prospective fault current.
Why Buy From Power & Data UK?
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.