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MCBs (miniature circuit breakers) protect electrical circuits against overload and short circuit faults. They are used in consumer units, distribution boards, and three-phase installations to disconnect power automatically when current rises beyond a safe level.
This collection includes Type B MCBs for standard circuits, Type C MCBs for circuits with higher inrush current, and selected specialist options for more demanding applications. Whether you’re replacing a single breaker or specifying a full board, this is the main hub for our MCB range.
Quick answer: An MCB is a resettable circuit breaker that protects wiring and connected equipment from overload and short circuit faults. The right MCB depends on the circuit rating, fault level, and whether you need a B curve, C curve, or more specialist trip characteristic.
MCBs are one of the most common circuit protection devices used in UK electrical installations. They are fitted across consumer units, three-phase boards, and enclosure-based builds to provide fast disconnection under fault conditions while remaining easy to reset once the issue is resolved.
Need earth leakage protection as well? Browse our RCBO range. For delivery and returns, see our delivery information and returns policy.
The WKC432B is a 32A 4 pole 10kA Miniature Circuit Breaker (MCB) for three-phase + neutral protection. With its B Curve trip profile, this...
The WKC425B is a 25A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral circuits. With a B Curve trip profile,...
The WKC420B is a 20A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its B Curve trip characteristic,...
The WKC416B is a 16A 4 pole 10kA Miniature Circuit Breaker (MCB) designed to protect three-phase + neutral circuits. With its B Curve trip...
The WKC410B is a 10A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral circuits. With a B Curve trip characteristic,...
The WKC316C 3 Pole 10kA MCB is a 16A C Curve breaker designed to protect three-phase circuits from short-circuit and overload faults. With a...
The WKC363B 3 Pole 10kA MCB is a 63A B Curve breaker engineered to protect heavy-duty three-phase circuits from short-circuit and overload faults. With...
The WKC350C 3 Pole 10kA MCB is a 50A C Curve miniature circuit breaker designed to protect three-phase circuits from overloads and short-circuits. With...
The WKC350B 3 Pole 10kA MCB is a 50A B Curve breaker providing reliable short-circuit and overload protection for three-phase circuits. Rated at 10kA...
The WKC340C 3 Pole 10kA MCB is a 40A C Curve breaker built for protecting three-phase circuits with moderate inrush currents. Rated at 10kA...
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...
The WKC310C 3 Pole 10kA MCB is a 10A C Curve breaker designed to protect three-phase circuits from short-circuit and overload faults. Rated at...
Select an MCB from the circuit design—not by amp rating alone. The device must coordinate with the conductor, connected load, prospective fault current and upstream protection. Confirm the required trip curve, pole format and breaking capacity before ordering.
Commonly used where normal inrush current is relatively low, including many lighting, socket and general-purpose circuits. Suitability still depends on the design calculations.
Allow a higher instantaneous trip threshold than B curve devices and are often considered for loads with greater starting current, subject to the required disconnection times.
Choose single-, two-, three- or four-pole formats for the supply and isolation requirement, then verify whether a 6kA, 10kA or other rated breaking capacity is needed.
Circuit Protection6kA MCBs10kA MCBsRCBOsThree Phase
Trade support: UK-stocked products, manufacturer-backed specifications and fast dispatch. Check each product page for ratings, standards, stock status and delivery details before ordering.
$132.00 ex VAT
VAT: Product prices exclude VAT. VAT is added at checkout.
