20A 2 Pole 10kA MCB – B Curve (WKC220B)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC220B is a 20A 2 Pole 10kA Miniature Circuit Breaker (MCB) built for reliable short-circuit and overload protection on small power, lighting, and radial circuits. With a B-curve tripping profile, it reacts quickly to overcurrents in resistive or lightly inductive loads such as air handling units, lighting spurs, or...
The WKC220B is a 20A 2 Pole 10kA Miniature Circuit Breaker (MCB) built for reliable short-circuit and overload protection on small power, lighting, and radial circuits. With a B-curve tripping profile, it reacts quickly to overcurrents in resistive or lightly inductive loads such as air handling units, lighting spurs, or single radial outlets.
This double-pole MCB isolates both live conductors simultaneously for safer maintenance and circuit separation, ensuring compliance with BS EN 60898-1 and 18th Edition Wiring Regulations. Suitable for use in consumer units, three-phase panels, and EV-ready boards.
Installer Tip: 20A breakers are often specified for radial power circuits and small motors. The B-curve handles typical domestic loads, while C curve and D curve models are better for heavier inductive or commercial plant applications.
Key Features
- 20A rated – ideal for radial power and small HVAC circuits
- 10kA breaking capacity – suitable for higher fault-level installations
- 2-pole isolation – disconnects both live conductors for enhanced safety
- B-curve tripping – rapid response to overcurrent faults
- Bi-directional terminals – can be wired from supply or load side
- 36 mm (2 module) width – fits all 35 mm DIN rail enclosures
- Tested and approved to IEC/EN 60898-1
- Compatible with EV consumer units and three-phase distribution boards
Compare 2 Pole 10kA MCB Variants
| Model | Rating | Curve |
|---|---|---|
| WKC220B | 20A | B Curve (This Product) |
| WKC220C | 20A | C Curve |
| WKC220D | 20A | D Curve |
What circuits use a 20A B curve MCB?
Typically used for radial socket circuits, small HVAC fans, or heating controls where inrush current is low.
Does this MCB isolate both live lines?
Yes – 2-pole isolation disconnects both live conductors simultaneously for complete circuit safety.
Is this compliant with BS EN 60898-1?
Yes – fully tested and compliant with BS EN 60898-1 and the 18th Edition Wiring Regulations.
Can it be used in three-phase systems?
Yes – it’s often used on single-phase spurs or control circuits within three-phase distribution boards.
- Model: WKC220B
- Poles: 2
- Rated Current: 20 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: Radial circuits, small motors, lighting spurs, HVAC feeds
Install in accordance with BS 7671 and local distribution board manufacturer guidelines. Always confirm curve and rating suitability for the connected load.
- Mount securely on 35 mm DIN rail (EN 60715)
- Check terminal torque settings (2.0–2.5 Nm recommended)
- Perform insulation and polarity checks before energising
- Label all protected circuits clearly in the board schedule
