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Type C MCBs, also called C curve circuit breakers or Type C breakers, are used on circuits with higher start-up current than standard domestic loads. They provide overload and short-circuit protection while allowing motor-driven and inductive equipment to start without unnecessary tripping.
Common uses include compressors, pumps, HVAC equipment, heat pumps, workshop machinery, commercial distribution boards and circuits where a B curve MCB may trip too easily during normal start-up.
Quick answer: A Type C MCB typically trips at 5–10 times its rated current under magnetic fault conditions. This makes C curve MCBs suitable for circuits with moderate inrush current, such as motors, compressors, HVAC and some commercial equipment.
Choose the MCB curve based on the connected load, circuit design, fault level and manufacturer requirements. C curve devices are not a default upgrade from Type B; they should be selected where the inrush characteristics of the load justify the higher magnetic trip threshold.
For related protection, browse our B Curve MCBs, 10kA MCBs, RCBOs and circuit protection devices.
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A C curve MCB has a higher instantaneous magnetic trip threshold than a B curve device, which can suit loads with moderate inrush current. It should only be selected when the circuit calculations, fault current and required disconnection times support that characteristic.
Used on suitable final circuits with higher starting current. Select the amp rating from the design and confirm compatibility with the distribution board.
Two-, three- and four-pole formats support different supply and isolation arrangements. Confirm which live conductors must be switched.
The breaking capacity must be at least suitable for the prospective fault current at the installation point; it is separate from the trip curve.
B Curve MCBs10kA MCBs3-Pole MCBs4-Pole MCBsRCBOs
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.
