Circuit Protection – MCB, RCD & RCBO Breakers
Choose from our range of MCBs, RCDs, and RCBOs – all designed for safe, compliant, and reliable circuit protection under the 18th Edition. We also stock High Immunity RCBOs for EV/solar circuits and Type B RCDs for DC fault protection.
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MCBs (Miniature Circuit Breakers) protect against overloads and short circuits, RCDs (Residual Current Devices) guard against earth leakage, and RCBOs combine both protections in a single device – now the preferred option for many UK domestic and commercial installs.
- Type B, C & D breakers – suitable for different load types and fault conditions
- Compact RCD enclosures – ideal for garages, outdoor feeds, and sub-circuits
- Type A & Type B RCBOs – futureproof installs with advanced fault coverage
- BS EN certified – tested and compliant with UK wiring regulations
All products are clearly labelled, warrantied for 2 years, and available with next-day UK delivery if ordered before 2pm. See our returns policy for hassle-free returns.
WKC 3 Pole 10kA MCB – 25A B Curve (WKC325B)
£21.30
The WKC325B 3 Pole 10kA MCB is a 25A B Curve breaker engineered for protecting three-phase circuits from short-circuit and overload faults. Rated at 10kA breaking capacity and BS 7671 compliant, it’s widely used across industrial distribution boards, EV charger installs, and solar PV applications....
WKC 3 Pole 10kA MCB – 20A D Curve (WKC320D)
£21.30
The WKC320D 3 Pole 10kA MCB is a 20A D Curve breaker engineered for three-phase circuits with heavy inrush currents. With a 10kA breaking capacity and full compliance with BS 7671 (18th Edition), it provides safe disconnection of overloads and short-circuits in demanding environments. This...
WKC 3 Pole 10kA MCB – 20A C Curve (WKC320C)
£21.30
The WKC320C 3 Pole 10kA MCB is a 20A C Curve breaker built to safeguard three-phase circuits against overload and short-circuit faults. With a 10kA breaking capacity and full compliance with BS 7671 (18th Edition), it’s ideal for circuits with moderate inrush currents such as...
WKC 3 Pole 10kA MCB – 20A B Curve (WKC320B)
£21.30
The WKC320B 3 Pole 10kA MCB is a 20A B Curve breaker designed to protect three-phase circuits against overloads and short circuits. With a 10kA breaking capacity and compliance to BS 7671 (18th Edition), it’s a trusted choice for industrial boards, EV charger setups, and...
WKC 3 Pole 10kA MCB – 16A D Curve (WKC316D)
£21.30
The WKC316D 3 Pole 10kA MCB is a 16A D Curve breaker designed for heavy-duty three-phase circuits subject to high inrush currents. With a 10kA breaking capacity and compliance with BS 7671 (18th Edition), it offers safe disconnection during overload and short-circuit faults. Ideal for...
Understanding Circuit Protection
Every electrical installation in the UK relies on the right circuit protection to keep people and property safe. Under the 18th Edition Wiring Regulations, MCBs, RCDs, and RCBOs each play a critical role in managing faults and preventing serious damage or injury.
MCBs – Overload & Short Circuit Protection
Miniature Circuit Breakers (MCBs) automatically trip if a circuit draws more current than it can safely handle, or if a short circuit occurs. They are available in different trip curves (B, C, D) to match the type of load – from standard domestic circuits to high inrush motors and industrial equipment.
Installer favourite: 10kA MCBs for domestic and light commercial circuits.
RCDs – Earth Leakage Protection
Residual Current Devices (RCDs) are designed to protect people by disconnecting the supply if they detect current leaking to earth – a sign of electric shock risk or faulty equipment. They are mandatory on most UK final circuits and are typically rated at 30mA for personal protection.
Example product: 2-Pole A-Type 100mA Time Delay RCD, suited for submain and select commercial installs.
RCBOs – Combined Protection
Residual Current Breaker with Overcurrent (RCBO) combines the functions of an MCB and an RCD in a single unit. This gives each circuit its own dedicated protection, reducing nuisance tripping and aligning with modern best practice for new builds and upgrades.
Best-seller: A-Type RCBO – available in multiple ratings for modern domestic installs.
Key Buying Considerations
- Type A or Type B devices – Type A is now standard, while Type B covers DC leakage common in EV chargers, heat pumps, and solar systems.
- Trip curve selection – B-curve for domestic, C-curve for commercial, D-curve for industrial/high inrush loads.
- Current rating – match the breaker to the cable size and expected load to avoid nuisance trips.
- Single vs double pole – choose based on isolation requirements and application.
Why Buy From Power & Data UK?
All our circuit protection devices are BS EN certified, backed by a 2-year warranty, and supplied from our UK warehouse. We offer free next-day delivery on orders over £30, with Saturday delivery options available. If you need to return an item, see our returns policy.
Related Categories
Looking for more protection solutions? Explore our full ranges:
- Surge Protection Devices (SPD)
- High Immunity RCBOs
- Type B RCDs
- EV Consumer Units & Kits
- Heat Pump Consumer Units
Common Questions
Do I need an RCBO or an RCD?
RCBOs are now widely preferred as they protect individual circuits and avoid losing power to the whole board when one circuit trips. RCDs are still common in older setups and for grouped circuits.
What’s the difference between Type A and Type AC RCDs?
Type A units detect both AC and pulsed DC leakage and are required for modern electronics, EV chargers, and heat pumps. Type AC is being phased out for most applications in the UK.
Can I mix MCBs, RCDs and RCBOs?
Yes – many consumer units are designed to house a combination. For new installs, RCBOs are usually recommended for maximum safety and flexibility.