WKC 3 Pole 10kA MCB – 63A B Curve (WKC363B)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC363B 3 Pole 10kA MCB is a 63A B Curve breaker engineered to protect heavy-duty three-phase circuits from short-circuit and overload faults. With a robust 10kA breaking capacity and full compliance to BS 7671 (18th Edition), it’s trusted in industrial distribution boards, EV charger setups, and solar PV systems....
The WKC363B 3 Pole 10kA MCB is a 63A B Curve breaker engineered to protect heavy-duty three-phase circuits from short-circuit and overload faults. With a robust 10kA breaking capacity and full compliance to BS 7671 (18th Edition), it’s trusted in industrial distribution boards, EV charger setups, and solar PV systems. Compact, DIN rail mountable, and bi-directional, it delivers reliable disconnection under demanding fault conditions.
Installer Tip: Choose the B Curve version for resistive loads. For inductive or high-inrush applications, check the C Curve or D Curve models.
Key Features
- 63A rated current – handles heavy three-phase resistive loads
- B Curve tripping – quick disconnection (3–5x In)
- 10kA breaking capacity – safe clearance under high fault levels
- 3 Pole design: covers all three phases
- Bi-directional: top or bottom wiring flexibility
- Applications: industrial distribution boards, heavy lighting, socket circuits, EV & PV installs
Compare 63A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC363B (This Product) | B Curve | 63A | 10kA |
| WKC363C | C Curve | 63A | 10kA |
| WKC363D | D Curve | 63A | 10kA |
Where is the WKC363B typically used?
In industrial and commercial boards protecting heavy-duty three-phase resistive loads such as socket banks, large lighting runs, and distribution circuits.
What’s the difference between B, C, and D Curve?
B Curve trips at 3–5x In for resistive loads. C Curve trips at 5–10x In for inductive loads, while D Curve trips at 10–20x In for heavy inrush loads.
Why use a 10kA breaker?
10kA ensures the breaker can safely clear high fault currents often present in commercial and industrial systems.
Is it bi-directional?
Yes — wiring can be connected from either top or bottom terminals.
Is it suitable for EV and PV systems?
Yes — commonly used in EV charge points and solar PV boards.
- Product Code: WKC363B
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 63A
- 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
Mount this breaker on DIN rails inside consumer units or industrial distribution boards. Curve type guidance:
- B Curve: for resistive loads (lighting, sockets)
- C Curve: for inductive loads (motors, HVAC, EV chargers)
- D Curve: for high inrush loads (welders, transformers)
Ensure that fault levels at the installation site do not exceed 10kA. Installation must comply with BS 7671 and be performed by a qualified electrician.
