6kA MCB – 25A 1 Pole C Curve (WMC125C)
£1.84
£2.99
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £80+
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The WMC125C is a 25 A single-pole 6 kA Miniature Circuit Breaker (MCB) designed for radial and equipment circuits subject to moderate inrush currents such as motors, compressors or EV chargers. Its C-curve tripping characteristic (5–10 × In) offers greater surge tolerance while providing rapid short-circuit and overload protection. Fully...
The WMC125C is a 25 A single-pole 6 kA Miniature Circuit Breaker (MCB) designed for radial and equipment circuits subject to moderate inrush currents such as motors, compressors or EV chargers. Its C-curve tripping characteristic (5–10 × In) offers greater surge tolerance while providing rapid short-circuit and overload protection.
Fully compliant with BS EN 60898, the WMC125C fits Whitecliffe consumer units and any standard DIN-rail board. It provides a 6 kA breaking capacity and 20 000-operation mechanical life, making it ideal for domestic and light-commercial installations requiring inrush-resilient protection.
Installer Tip: Select C-curve MCBs when feeding motors or EV chargers to prevent nuisance tripping. Always verify Zs, voltage drop and cable sizing to stay within BS 7671 limits.
- 20 A rated current with C-curve (5–10 × In) tripping characteristic
- 6 kA breaking capacity at 230/400 V AC
- Single-pole design – 18 mm module width
- DIN-rail mounted – fits 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 |
|---|---|---|---|
| WMC116C | 16 A | C | Radials with motors or pumps |
| WMC120C | 20 A | C | Radials / feed circuits with EV chargers or tools |
| WMC132C | 32 A | C | Heavier equipment or industrial circuits |
The WMC125C provides 6 kA fault protection for radials and equipment loads with moderate inrush current. For standard domestic circuits, choose a B Curve MCB; for earth-fault and overload protection combined, see our Type A RCBO range.
When should I use a C Curve 20 A MCB?
Use on circuits feeding motors, pumps or EV chargers where start-up currents exceed the B-curve limit (5–10 × In tolerance).
Is the WMC120C compatible with Whitecliffe boards?
Yes – it fits all Whitecliffe consumer units and standard 18 mm DIN-rail enclosures.
Can this breaker protect an EV circuit?
Yes – the C-curve profile makes it suitable for most single-phase EV feed circuits. Always follow BS 7671 and manufacturer guidance.
What does 6 kA mean?
6 kA is the maximum fault current the MCB can interrupt safely. For higher fault-level sites, see our 10 kA range.
Do you stock D Curve versions?
Yes – Type D (10–20 × In) MCBs for industrial inrush loads are available on request. Contact our sales team for details.
- Part Code: WMC120C
- Type: Single Pole MCB
- Rated Current (In): 20 A
- Curve: C (5–10 × In tripping characteristic)
- Rated Voltage (Ue): 230/400 V AC
- Rated Frequency: 50/60 Hz
- Breaking Capacity (Icn): 6 kA
- Insulation Voltage (Ui): 500 V
- Impulse Withstand (Uimp): 4 kV
- Dielectric Test Voltage: 2 kV for 1 minute
- Thermal Reference Temp: 30 °C
- Operating Temperature: –5 °C to +40 °C (avg < 35 °C)
- Mechanical Life: 20 000 operations
- Electrical Life: 8 000 operations
- Mounting: 35 mm DIN rail (1 module width)
- Standards: BS EN 60898; BS 7671:2018 (Amendment 2)
- Typical Applications: Radials with motors, EV chargers or transformers requiring inrush tolerance
Install the WMC120C in a suitable consumer unit or distribution board by a qualified electrician. Match rating and curve to the circuit design and expected load profile.
- Mount securely on 35 mm DIN rail with correct busbar alignment
- Use C-curve for EV chargers, motors or transformer-based loads
- Confirm Zs and voltage drop comply with BS 7671
- Tighten terminals to manufacturer torque values and record EIC results
