MCBs – Miniature Circuit Breakers
Miniature Circuit Breakers (MCBs) protect against overloads and short circuits, ensuring circuits disconnect safely under fault conditions. We stock Type B MCBs for domestic circuits and Type C MCBs for commercial/industrial loads, plus selected Type D options for specialist use. All are BS EN 60898 compliant and shipped with next-day UK delivery.
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All our MCBs are clearly labelled, long-life tested, and essential in consumer units and three-phase boards to protect wiring and appliances. They disconnect circuits rapidly in the event of overload or fault, preventing damage and ensuring compliance with 18th Edition Wiring Regulations.
- Type B MCBs – trip at 3–5x rated current; ideal for sockets and lighting
- Type C MCBs – trip at 5–10x rated current; suited to motors, pumps, fluorescent lighting
- Type D MCBs – trip at 10–20x rated current; specialist option for high inrush equipment
Looking for combined overload + earth leakage protection? See our RCBO range. For returns support, check our returns policy.
6kA MCB – 32A 1 Pole C Curve (WMC132C)
£1.84
£2.99
The WMC132C is a 32 A single-pole 6 kA Miniature Circuit Breaker (MCB) built for high-load circuits with moderate to high inrush current - including cookers, workshop sockets and small machinery. Its C-curve tripping profile (5–10 × In) provides extra immunity to motor and transformer...
6kA MCB – 40A 1 Pole C Curve (WMC140C)
£1.84
£2.99
The WMC140C is a 40 A single-pole 6 kA Miniature Circuit Breaker (MCB) designed for sub-mains, plant feeds and high-load circuits where inrush currents from motors or transformers could trip a B-curve device. Its C-curve tripping profile (5–10 × In) provides extra surge tolerance while...
6kA MCB – 50A 1 Pole C Curve (WMC150C)
£1.84
£2.99
The WMC150C is a 50 A single-pole 6 kA Miniature Circuit Breaker (MCB) providing reliable overcurrent and short-circuit protection for feed circuits, plant equipment and sub-boards with moderate-to-high inrush currents. Its C-curve tripping characteristic (5–10 × In) handles motor and transformer surges without nuisance tripping...
6kA MCB – 63A 1 Pole C Curve (WMC163C)
£1.84
£2.99
The WMC163C is a 63 A single-pole 6 kA Miniature Circuit Breaker (MCB) designed for large feed and distribution circuits where inrush currents from motors, welders or transformers demand higher tolerance. Its C-curve tripping profile (5–10 × In) provides robust inrush immunity while ensuring rapid...
6kA MCB – 63A 1 Pole B Curve (WMC163B)
£1.84
£2.99
The WMC163B is a 63 A single-pole 6 kA Miniature Circuit Breaker (MCB) built for high-load distribution circuits, feed boards and plant equipment. It delivers accurate overcurrent and short-circuit protection using a B-curve tripping profile (3–5 × In), providing fast disconnection on faults without nuisance...
What Is an MCB?
An MCB (Miniature Circuit Breaker) is an automatically operated switch that trips to protect circuits from overload (too much current) or short circuit faults. They replace traditional fuses, offering quicker reset, safer operation, and compliance with BS EN 60898.
Types of MCBs
- Type B – trips at 3–5x rated current; standard for domestic circuits such as sockets and lighting. Popular choice:10kA MCBs (Type B).
- Type C – trips at 5–10x rated current; used for inductive/motor loads in workshops and commercial sites. Example: 1-Pole 10kA Type C MCB.
- Type D – trips at 10–20x rated current; for industrial kit with high inrush current (specialist use).
MCB Ratings & Sizes
MCBs come in a range of current ratings, typically from 6A to 100A. Choose the correct pole configuration and breaking capacity for your install:
- Single pole – most domestic circuits
- Double pole – where both live and neutral must be isolated
- Three/four pole – used in three-phase distribution boards
Compliance
All our MCBs meet BS EN 60898 standards, making them fully compliant with the 18th Edition Wiring Regulations. This ensures safe disconnection times and compatibility with modern UK boards.
FAQs on MCBs
What’s the difference between an MCB and an RCBO?
An MCB protects against overloads and short circuits. An RCBO combines this with RCD protection for earth leakage faults.
How do I choose between Type B and Type C?
Use Type B for domestic circuits with low inrush currents (sockets, lighting). Use Type C for circuits with motors, pumps, or fluorescent lighting.
Do MCBs need replacing after they trip?
No – unlike fuses, MCBs can be reset once the fault is cleared, making them reusable and safer.
Why Buy From Power & Data UK?
All MCBs are UK stocked, BS EN compliant, and supplied with a 2-year warranty. Orders placed before 2pm ship same-day with next-day delivery on purchases over £30. If you need to return an item, see our returns policy.