25A 4 Pole 10kA MCB B Curve – WKC425B
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC425B is a 25A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral circuits. With a B Curve trip profile, it is best used for resistive loads such as lighting banks, socket circuits, and small distribution panels in commercial three-phase boards, EV distribution units, and solar...
The WKC425B is a 25A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral circuits. With a B Curve trip profile, it is best used for resistive loads such as lighting banks, socket circuits, and small distribution panels in commercial three-phase boards, EV distribution units, and solar PV systems.
Rated at 10kA breaking capacity, the WKC425B ensures reliable overload and short-circuit protection with complete neutral isolation. It is DIN-rail mounted, bi-directional, and fully compliant with BS 7671 (18th Edition).
Installer Tip: The 25A B Curve breaker is a good choice for general socket or small power distribution circuits. Always confirm fault levels do not exceed 10kA before selection.
Key Features
- 25A 4 Pole MCB – B Curve trip characteristic
- 10kA breaking capacity – suited for commercial & industrial boards
- Neutral protection: 4P switching (L1, L2, L3, N)
- Bi-directional feed: cable entry top or bottom
- DIN-rail mounted: 18mm per module
- Conforms to BS 7671 (18th Edition)
Compare WKC 4 Pole 10kA MCBs (B Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC420B | 20A | B Curve | 10kA |
| WKC425B (This Product) | 25A | B Curve | 10kA |
| WKC432B | 32A | B Curve | 10kA |
| WKC440B | 40A | B Curve | 10kA |
What circuits is a 25A B Curve breaker suited to?
It’s commonly used for socket circuits and small power distribution where load inrush is low.
Why use a 4-pole breaker instead of 3-pole?
It isolates and protects the neutral along with all three live phases, giving full disconnection for three-phase + N circuits.
Can this MCB be used for EV charging circuits?
Yes, provided it’s protecting a resistive load and the system fault level is within 10kA. For inductive charger loads, a C Curve model is preferable.
Does the WKC425B comply with regulations?
Yes — it meets BS 7671 (18th Edition) and IEC/EN 60898-1 standards.
- Model: WKC425B
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 25A
- Curve: B Curve
- Poles: 4P (L1, L2, L3 + Neutral)
- Breaking Capacity: 10kA
- Mounting: 35mm DIN rail, 18mm per module
- Dimensions: Approx. 72mm (W) x 90mm (H) x 77mm (D)
- Compliance: BS 7671 (18th Edition), IEC/EN 60898-1
- Brand: WCED
The WKC425B must be installed by a qualified electrician in line with BS 7671 requirements.
- Mount on 35mm DIN rail (18mm per pole)
- Check system fault current ≤10kA
- Use for resistive loads (B Curve only)
- Apply correct terminal torque
- Confirm enclosure size allows for 4P switching
