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.
Read more
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.
High Immunity RCBO – 20A B Curve, Type A, 30mA (WER20B-030)
£18.67
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, and EV-ready boards. It combines overload, short-circuit, and 30mA residual current protection in one device, while its high immunity design helps...
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A MCB
£65.38
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a ready-to-fit 3-Phase Surge Protection Device (SPD) Unit supplied in an 8-way IP40 steel enclosure. It includes a 4-pole Type 2 SPD (20kA/40kA) paired with...
6kA MCB – 6A 1 Pole B Curve (WMC106B)
£1.84
£2.99
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 circuits. Rated for 230/400 V AC operation, it features a B-curve tripping characteristic that reacts at 3–5 × rated current -...
Type 2 Surge Protection Device Kit with Forked Busbars (WSPD240KIT2)
£21.80
WSPD240KIT2 is a Type 2 surge protection device kit supplied with forked busbars and an earth lead for a faster, tidier installation. It is designed to help protect electrical installations against transient overvoltages while keeping wiring neat and terminal space free. This kit is suited...
Surge Protection Unit with Forked Wire Kit WSPD240Kit1
£18.45
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. Rated at 40kA, it protects against transient overvoltages caused by lightning and switching surges, safeguarding sensitive electronic equipment and keeping your...
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.