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.
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...
High Immunity Type A 4 Pole RCBO – 32A (ADR432C-30)
£37.14
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 required. With 30mA residual current protection, 6mA DC detection, and a 10kA breaking capacity, it is well suited to EV charger...
Surge Protection Device (Surge Arrestor) WSPD240
£19.08
£22.00
The WSPD240 is a compact Type 2 Surge Protection Device (SPD) rated for 40kA discharge - designed to protect domestic and commercial installations from transient overvoltages caused by switching events or nearby lightning strikes. Fully compliant with BS7671 (18th Edition Amendment 2) and IEC 61643-11,...
4 Pole Type 2 Surge Protection Device (WSPD440 )
£30.57
The WSPD440 is a 4 pole Type 2 surge protection device for 230/400V three-phase + neutral systems. Designed to help protect electrical and electronic equipment against transient overvoltages, the WSPD440 provides 20kA nominal discharge current and 40kA maximum discharge current in a compact DIN rail-mounted...
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.
Explore Related Categories
- Surge Protection Devices (SPD)
- Heat Pump Consumer Units
- EV Consumer Units & Kits
- Three-Phase Boards & Accessories