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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 ensuring rapid disconnection under fault conditions.
Tested to BS EN 60898, the WMC140C fits all Whitecliffe consumer units and standard DIN-rail enclosures. It delivers a 6 kA breaking capacity and 20 000-cycle mechanical life for dependable performance in domestic and light-commercial applications.
Installer Tip: Use C-curve breakers for circuits feeding motors, compressors or sub-boards where brief startup surges occur. Verify Zs, voltage drop and protective coordination to stay BS 7671-compliant.
- 40 A rated current with C-curve (5–10 × In) tripping profile
- 6 kA breaking capacity at 230/400 V AC
- Single-pole design – 18 mm module width
- DIN-rail mounted for consumer units and distribution boards
- Complies with BS EN 60898 and BS 7671 (18th Edition A2)
- Service life – 20 000 mechanical / 8 000 electrical operations
| Part Code | Rating | Curve | Typical Use |
|---|---|---|---|
| WMC132C | 32 A | C | Cookers and workshop equipment |
| WMC140C | 40 A | C | Sub-mains and plant feeds |
| WMC150C | 50 A | C | Feed and equipment circuits with high inrush |
The WMC140C delivers 6 kA short-circuit and overload protection for feed and equipment circuits with moderate inrush. For resistive loads use a B Curve MCB, or add earth-fault protection with our Type A RCBOs.
