50A 2 Pole 10kA MCB – B Curve (WKC250B)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC250B is a 50A 2 Pole 10kA Miniature Circuit Breaker (MCB) engineered for heavy-duty protection of fixed power and distribution circuits. With a fast-acting B-curve tripping profile, it provides reliable disconnection under overload or short-circuit conditions in heating systems, small machinery, and industrial plant feeds. Built for high reliability,...
The WKC250B is a 50A 2 Pole 10kA Miniature Circuit Breaker (MCB) engineered for heavy-duty protection of fixed power and distribution circuits. With a fast-acting B-curve tripping profile, it provides reliable disconnection under overload or short-circuit conditions in heating systems, small machinery, and industrial plant feeds.
Built for high reliability, this dual-pole unit isolates both live conductors simultaneously to enhance safety and meet BS EN 60898-1 standards. Compact 36 mm housing fits standard 35 mm DIN rails across consumer units, metal enclosures, and three-phase panels.
Installer Tip: A 50 A B-curve breaker is perfect for heating loads or low-inrush plant circuits. For higher surge equipment such as compressors or pumps, opt for the C-curve or D-curve version.
Key Features
- 50 A rated – ideal for plant feeds, heaters, and small distribution spurs
- 10 kA breaking capacity – safe under high-fault conditions
- 2-pole isolation – disconnects both live conductors together
- B-curve tripping – fast operation for resistive or lightly inductive loads
- Bi-directional terminals – line or load wiring flexibility
- 36 mm (2-module) body for compact DIN-rail fit
- Certified to IEC/EN 60898-1 for 18th Edition compliance
- Suited to industrial boards and EV control units
Compare 2 Pole 10 kA MCB Variants
| Model | Rating | Curve |
|---|---|---|
| WKC250B | 50 A | B Curve (This Product) |
| WKC250C | 50 A | C Curve |
| WKC250D | 50 A | D Curve |
What circuits suit a 50 A B-curve MCB?
Ideal for heaters, industrial spurs, and small plant circuits with low inrush currents.
Does it isolate both lines?
Yes – the 2-pole design disconnects both live conductors at once for complete safety.
Is this compliant with BS EN 60898-1?
Yes – fully certified and compliant with BS EN 60898-1 and 18th Edition Amendment 2 requirements.
Can it be fitted in an outdoor board?
Yes – if enclosed within a suitable IP-rated enclosure for environmental protection.
- Model: WKC250B
- Poles: 2
- Rated Current: 50 A
- Curve Type: B
- 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: Heaters, plant feeds, industrial spurs, EV boards
Install by a qualified electrician under BS 7671. Verify cable sizing and load type before energising the circuit.
- Mount on 35 mm DIN rail (EN 60715)
- Torque terminals to 2.0–2.5 Nm
- Confirm polarity and insulation resistance before connection
- Record and label protected circuit in the distribution schedule
