WKC 3 Pole 10kA MCB – 50A B Curve (WKC350B)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
Secure Payments With
The WKC350B 3 Pole 10kA MCB is a 50A B Curve breaker providing reliable short-circuit and overload protection for three-phase circuits. Rated at 10kA breaking capacity and compliant with BS 7671 (18th Edition), it’s a trusted solution for industrial boards, EV installations, and solar PV systems. Compact and bi-directional, it...
The WKC350B 3 Pole 10kA MCB is a 50A B Curve breaker providing reliable short-circuit and overload protection for three-phase circuits. Rated at 10kA breaking capacity and compliant with BS 7671 (18th Edition), it’s a trusted solution for industrial boards, EV installations, and solar PV systems. Compact and bi-directional, it fits standard DIN rail consumer units and distribution boards.
Installer Tip: The B Curve is recommended for resistive loads such as lighting and socket outlets. For inductive or high inrush loads, see the C Curve or D Curve versions.
Key Features
- 50A rated current – suitable for larger three-phase resistive loads
- B Curve tripping – fast disconnection for general-purpose circuits
- 10kA breaking capacity – safe interruption of high fault currents
- 3 Pole design: full protection across three phases
- Bi-directional: allows wiring from top or bottom
- Applications: commercial lighting, socket banks, EV & PV installs
Compare 50A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC350B (This Product) | B Curve | 50A | 10kA |
| WKC350C | C Curve | 50A | 10kA |
| WKC350D | D Curve | 50A | 10kA |
What’s the WKC350B best used for?
Protecting three-phase circuits carrying 50A resistive loads such as commercial lighting banks or socket outlets.
How does a B Curve compare with C and D?
B Curve trips at 3–5x In for resistive loads. C Curve trips at 5–10x In for inductive loads. D Curve trips at 10–20x In for high inrush loads.
Why 10kA breaking capacity?
It guarantees safe fault clearance under high prospective fault currents, common in industrial boards.
Is the WKC350B bi-directional?
Yes — it can be wired top or bottom.
Can it be used in EV and PV installs?
Yes — widely used for EV protection and solar distribution.
- Product Code: WKC350B
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 50A
- 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 distribution boards. Select curve based on load:
- B Curve: resistive loads (lighting, sockets)
- C Curve: inductive loads (motors, HVAC, EV chargers)
- D Curve: high inrush loads (transformers, welders)
Confirm 10kA breaking capacity matches site fault levels. Installation must comply with BS 7671 and be performed by a qualified electrician.
