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The WKC240B is a 40A 2 Pole 10kA Miniature Circuit Breaker (MCB) designed to protect higher-load radial and feeder circuits against short-circuit and overload faults. The B-curve tripping profile ensures rapid disconnection for resistive and low-inrush circuits such as outbuilding sub-mains, immersion heaters, and EV control feeds.
With dual-pole isolation, both live conductors are disconnected simultaneously to enhance safety and regulatory compliance under BS EN 60898-1. The compact 36 mm housing allows easy DIN-rail mounting within consumer units or three-phase boards.
Installer Tip: Use a 40A B-curve MCB for small sub-main feeds or high-current resistive circuits. For equipment with heavier startup current – such as large pumps or compressors – consider the C-curve or D-curve alternative.
Key Features
- 40 A rated – ideal for outbuilding supplies, EV control circuits, and immersion heaters
- 10 kA breaking capacity – built to withstand high fault levels
- 2-pole isolation – disconnects both live conductors simultaneously
- B-curve tripping – fast operation for resistive or low inrush circuits
- Bi-directional terminals – supply and load can be wired either end
- 36 mm (2-module) width – fits any standard 35 mm DIN rail
- BS EN 60898-1 compliant – 18th Edition regulation ready
- Compatible with EV consumer units and metal enclosures
Compare 2 Pole 10 kA MCB Variants
| Model | Rating | Curve |
|---|---|---|
| WKC240B | 40 A | B Curve (This Product) |
| WKC240C | 40 A | C Curve |
| WKC240D | 40 A | D Curve |
