40A 2 Pole 10kA MCB – C Curve (WKC240C)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC240C is a 40 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) providing robust short-circuit and overload protection for moderate inrush applications. The C-curve tripping characteristic is ideal for HVAC systems, small machinery, and feeder circuits where start-up currents exceed standard B-curve tolerances. Featuring dual-pole isolation, the breaker...
The WKC240C is a 40 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) providing robust short-circuit and overload protection for moderate inrush applications. The C-curve tripping characteristic is ideal for HVAC systems, small machinery, and feeder circuits where start-up currents exceed standard B-curve tolerances.
Featuring dual-pole isolation, the breaker disconnects both live conductors simultaneously for improved safety and compliance with BS EN 60898-1. Its compact 36 mm housing fits any 35 mm DIN rail across consumer units, distribution boards, or industrial enclosures.
Installer Tip: The 40 A C-curve MCB is well suited for HVAC plant and feeder circuits where a B-curve may trip unnecessarily. For high inrush applications such as compressors or large pumps, upgrade to the D-curve version.
Key Features
- 40 A rated – ideal for HVAC, machinery, and feeder circuits
- 10 kA breaking capacity – suitable for high fault-level environments
- 2-pole isolation – disconnects both live conductors at once
- C-curve tripping – prevents nuisance tripping on moderate inrush
- Bi-directional terminals – flexible top or bottom feed connection
- 36 mm (2-module) DIN-rail body
- Complies with IEC/EN 60898-1 and the 18th Edition Wiring Regulations
Compare 2 Pole 10 kA MCB Variants
| Model | Rating | Curve |
|---|---|---|
| WKC240B | 40 A | B Curve |
| WKC240C (This Product) | 40 A | C Curve |
| WKC240D | 40 A | D Curve |
What is a 40 A C-curve MCB used for?
Commonly used on HVAC plant, small sub-mains, or machinery circuits where inrush currents can cause B-curve devices to trip.
Does this MCB isolate both conductors?
Yes – 2-pole operation disconnects both live conductors simultaneously for full circuit isolation.
Can it be used for machinery circuits?
Yes – the C-curve design is suited to control gear, motors, and moderate inrush machinery circuits.
Is it compliant with BS EN 60898-1?
Yes – fully tested and certified to BS EN 60898-1 for use under the 18th Edition Wiring Regulations.
- Model: WKC240C
- Poles: 2
- Rated Current: 40 A
- Curve Type: C
- Breaking Capacity: 10 kA
- Operating Voltage: 230/400 V AC
- Mounting: 35 mm DIN rail (EN 60715)
- Width: 36 mm (2 modules)
- Standard: IEC/EN 60898-1
- Applications: HVAC plant, feeders, small sub-mains, machinery
Must be installed by a qualified electrician under BS 7671. Confirm circuit design, cable rating, and breaker curve before installation.
- Mount securely on 35 mm DIN rail (EN 60715)
- Torque terminals to 2.0–2.5 Nm
- Verify insulation and polarity before energising
- Record protected circuit on board schedule
