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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.

Showing 11 to 15 of 42 items
IP65 Plastic Pen Fault Detection Unit with Load Balancing Relay

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IP65 Plastic Pen Fault Detection Unit with Load Balancing Relay

£161.80

The IP65 PEN Fault Detection Unit with Load Balancing Relay is a regulation-ready solution for EV charger installations where PEN fault protection is mandatory. Fully compliant with BS7671:2018 Amendment 2, it isolates Live, Neutral, and Earth conductors during a fault – removing the need for...

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3-Pole Type A RCBO – 20A C Curve 30mA 10kA (WRT320C-030)

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3-Pole Type A RCBO – 20A C Curve 30mA 10kA (WRT320C-030)

£75.85

The WRT320C-030 is a 3-pole Type A RCBO combining residual current protection and overcurrent protection in a compact 3-module device. Rated at 20A with a C curve and 30mA sensitivity, it provides reliable protection against overload, short-circuit, and earth leakage faults across all three phases....

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3-Pole Type A RCBO – 32A C Curve 30mA 10kA (WRT332C-030)

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3-Pole Type A RCBO – 32A C Curve 30mA 10kA (WRT332C-030)

£75.85

The WRT332C-030 is a 3-pole Type A RCBO designed to provide combined residual current and overcurrent protection for three-phase installations. Rated at 32A with a C curve tripping characteristic and 30mA sensitivity, it protects circuits against overload, short-circuit, and earth leakage faults in a compact...

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3-Pole Type A RCBO – 32A B Curve 30mA 10kA (WRT332B-030)

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3-Pole Type A RCBO – 32A B Curve 30mA 10kA (WRT332B-030)

£75.85

The WRT332B-030 is a 3-pole Type A RCBO providing combined residual current and overcurrent protection for three-phase circuits. Rated at 32A with a B curve and 30mA sensitivity, it protects against overload, short-circuit, and earth leakage faults in a compact 3-module DIN rail format. Type...

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3-Pole Type A RCBO – 40A C Curve 30mA 10kA (WRT340C-030)

power-and-data-uk

3-Pole Type A RCBO – 40A C Curve 30mA 10kA (WRT340C-030)

£75.85

The WRT340C-030 is a 3-pole Type A RCBO providing combined residual current and overcurrent protection for three-phase circuits rated up to 40A. With a C curve tripping characteristic and 30mA sensitivity, it offers dependable protection against overload, short-circuit, and earth leakage faults in a compact...

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.

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