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 2 Pole 10kA MCB – C Curve (WKC240C)
£8.36
The WKC240C is a 40 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) providing robust short-circuit and overload protection for moderate inrush applications. The C-curve tripping characteristic is ideal for HVAC systems, small machinery, and feeder circuits where start-up currents exceed standard B-curve tolerances....
32A 2 Pole 10kA MCB – C Curve (WKC232C)
£8.36
The WKC232C is a 32 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) designed for reliable short-circuit and overload protection on circuits with moderate inrush current. The C-curve tripping profile provides tolerance for start-up surges — perfect for motors, ring mains, and sub-distribution feeds....
20A 2 Pole 10kA MCB – C Curve (WKC220C)
£8.36
The WKC220C is a 20 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) designed for protecting medium-load circuits with moderate inrush currents. The C-curve tripping profile provides additional tolerance during start-up, making it suitable for small pumps, HVAC units, lighting controls, and automation circuits....
16A 2 Pole 10kA MCB – C Curve (WKC216C)
£8.36
The WKC216C is a 16 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) designed for small-power and control circuits with moderate inrush currents. The C-curve tripping profile provides a short delay at start-up — ideal for motors, fans, heating controls, and automation panels where...
32A 2 Pole 10kA MCB – B Curve (WKC232B)
£8.36
The WKC232B is a 32A 2 Pole 10kA Miniature Circuit Breaker (MCB) providing fast and reliable protection against short-circuit and overload faults. Designed for ring mains, small distribution boards, and fixed-appliance feeds, this B-curve breaker offers quick disconnection for resistive and low-inrush circuits. Its dual-pole...
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.