WKC 3 Pole 10kA MCB – 25A B Curve (WKC325B)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC325B 3 Pole 10kA MCB is a 25A B Curve breaker engineered for protecting three-phase circuits from short-circuit and overload faults. Rated at 10kA breaking capacity and BS 7671 compliant, it’s widely used across industrial distribution boards, EV charger installs, and solar PV applications. Compact, bi-directional, and DIN rail...
The WKC325B 3 Pole 10kA MCB is a 25A B Curve breaker engineered for protecting three-phase circuits from short-circuit and overload faults. Rated at 10kA breaking capacity and BS 7671 compliant, it’s widely used across industrial distribution boards, EV charger installs, and solar PV applications. Compact, bi-directional, and DIN rail mountable, it provides reliable disconnection where safety and compliance are critical.
Installer Tip: Select B Curve devices for resistive loads such as lighting and socket outlets. For inductive or high-inrush loads, use the C Curve or D Curve alternatives.
Key Features
- 25A rated current – suitable for medium/heavy resistive loads
- B Curve tripping – quick fault response (3–5x In)
- 10kA breaking capacity – safe under high prospective fault currents
- 3 Pole protection – covers three-phase circuits
- Bi-directional: allows top or bottom wiring
- Applications: small machinery, lighting, sockets, EV/PV boards
Compare 25A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC325B (This Product) | B Curve | 25A | 10kA |
| WKC325C | C Curve | 25A | 10kA |
| WKC325D | D Curve | 25A | 10kA |
Where is the WKC325B typically used?
In three-phase installations protecting 25A resistive loads such as socket circuits, small distribution boards, or lighting setups.
How does B Curve differ from C and D?
B Curve trips at 3–5x rated current. C Curve trips at 5–10x In for inductive loads. D Curve trips at 10–20x In for heavy inrush circuits.
Why 10kA breaking capacity?
It ensures the breaker can disconnect safely under high fault currents, common in commercial and industrial boards.
Is this breaker bi-directional?
Yes — it can be wired from either the top or bottom terminals.
Can it be used in EV or solar installs?
Yes — this breaker is widely used in EV protection boards and solar distribution setups.
- Product Code: WKC325B
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 25A
- Curve: B Curve
- Breaking Capacity: 10kA
- Mounting: DIN rail, 18mm per module
- Functions: Overload & short-circuit protection, switching, isolation
- Compliance: BS 7671 (18th Edition)
- Endurance: 4000 mechanical / 2000 electrical operations
- Brand: WCED
Install on DIN rails in consumer units or distribution boards. Curve type selection:
- B Curve: resistive loads (lighting, sockets)
- C Curve: inductive loads (motors, HVAC, EV chargers)
- D Curve: high inrush equipment (transformers, welders)
Confirm site fault levels are within the 10kA rating. Installation must be by a qualified electrician, compliant with BS 7671.
