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 – 32A C Curve, Type A, 30mA (WER32C-030)
£19.80
The WER32C-030 is a 32A C Curve Type A High Immunity RCBO designed for circuits with higher inrush characteristics and modern electronic loads where unwanted tripping may be more likely. It is commonly specified for suitable EV charger circuits, solar PV systems, heat pumps, motors...
1 Pole 10kA MCB 6A B Curve WKC106B
£5.00
The WCED WKC Series 10kA Miniature Circuit Breakers (MCBs) are high-performance devices designed for precise overcurrent detection and short-circuit protection. Built to handle demanding applications, they provide reliable protection for domestic, commercial, and industrial distribution systems – including solar PV with SPD and EV charging...
High Immunity Type A Mini RCBO – 16A B Curve (WRB116B-030)
£11.85
The WRB116B-030 High Immunity Type A Mini RCBO is a 16A B Curve device designed to protect small power and lighting circuits while saving space in the board. At just 18mm wide, it combines residual current and overcurrent protection in one compact module. With 30mA...
High Immunity Type A Mini RCBO – 20A B Curve (WRB120B-030)
£11.85
WRB120B-030 is a 20A B Curve high immunity Type A mini RCBO designed for general-purpose domestic and commercial circuits. It combines overload, short-circuit, and residual current protection in one compact single-module device, making it ideal where board space is limited. As part of the Whitecliffe...
High Immunity RCBO – 40A C Curve, Type A, 30mA (WER40C-030)
£19.80
The WER40C-030 is a 40A C Curve Type A High Immunity RCBO designed for circuits with higher inrush characteristics, modern electronic loads and equipment where nuisance tripping may be more likely. It is commonly specified for suitable EV charger circuits, heat pumps, motors and inverter-fed...
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.