WKC 3 Pole 10kA MCB – 20A C Curve (WKC320C)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC320C 3 Pole 10kA MCB is a 20A C Curve breaker built to safeguard three-phase circuits against overload and short-circuit faults. With a 10kA breaking capacity and full compliance with BS 7671 (18th Edition), it’s ideal for circuits with moderate inrush currents such as EV chargers, motors, and solar...
The WKC320C 3 Pole 10kA MCB is a 20A C Curve breaker built to safeguard three-phase circuits against overload and short-circuit faults. With a 10kA breaking capacity and full compliance with BS 7671 (18th Edition), it’s ideal for circuits with moderate inrush currents such as EV chargers, motors, and solar PV systems. Compact, DIN rail mounted, and bi-directional, it delivers reliable protection in commercial and industrial environments.
Installer Tip: Choose C Curve breakers for inductive circuits like motors, HVAC, or EV chargers. For resistive loads, see the B Curve. For heavy inrush loads, use the D Curve model.
Key Features
- 20A rated current – medium three-phase inductive circuits
- C Curve tripping – operates at 5–10x In
- 10kA breaking capacity – ensures safe disconnection under fault
- 3 Pole design: protects all three phases
- Bi-directional: can be wired from top or bottom
- Applications: EV chargers, HVAC, motors, solar PV installs
Compare 20A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC320B | B Curve | 20A | 10kA |
| WKC320C (This Product) | C Curve | 20A | 10kA |
| WKC320D | D Curve | 20A | 10kA |
Where is the WKC320C typically used?
In three-phase installations protecting 20A inductive circuits such as motors, HVAC systems, or EV chargers.
How does C Curve differ from B and D?
C Curve trips at 5–10x In, ideal for moderate inrush. B Curve trips faster (3–5x In), while D Curve is slower (10–20x In).
Why choose a 10kA breaker?
10kA ensures safe interruption of high prospective fault currents often present in commercial and industrial boards.
Is this MCB bi-directional?
Yes — can be wired from either top or bottom terminals.
Is it suitable for EV and PV systems?
Yes — it’s widely used in EV charge point protection and solar PV distribution boards.
- Product Code: WKC320C
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 20A
- Curve: C 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 inside consumer units or distribution boards. Curve selection is essential:
- B Curve: resistive loads (lighting, sockets)
- C Curve: inductive loads (motors, HVAC, EV chargers)
- D Curve: heavy inrush loads (transformers, welders)
Ensure the installation fault level does not exceed the 10kA rating. All installations must follow BS 7671 and be completed by a qualified electrician.
