WKC 3 Pole 10kA MCB – 20A B Curve (WKC320B)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC320B 3 Pole 10kA MCB is a 20A B Curve breaker designed to protect three-phase circuits against overloads and short circuits. With a 10kA breaking capacity and compliance to BS 7671 (18th Edition), it’s a trusted choice for industrial boards, EV charger setups, and solar PV installs. Compact, bi-directional,...
The WKC320B 3 Pole 10kA MCB is a 20A B Curve breaker designed to protect three-phase circuits against overloads and short circuits. With a 10kA breaking capacity and compliance to BS 7671 (18th Edition), it’s a trusted choice for industrial boards, EV charger setups, and solar PV installs. Compact, bi-directional, and DIN rail mounted, it provides safe and reliable disconnection in demanding applications.
Installer Tip: The B Curve version is recommended for resistive circuits (lighting, socket outlets). For inductive or high inrush loads, consider the C Curve or D Curve options.
Key Features
- 20A rated current – for medium-duty three-phase loads
- B Curve tripping – fast disconnection for resistive circuits
- 10kA breaking capacity – safe fault clearance in commercial/industrial boards
- 3 Pole design: full three-phase protection
- Bi-directional: wiring from top or bottom
- Applications: lighting, socket outlets, small distribution boards, EV/PV circuits
Compare 20A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC320B (This Product) | B Curve | 20A | 10kA |
| WKC320C | C Curve | 20A | 10kA |
| WKC320D | D Curve | 20A | 10kA |
Where should the WKC320B be installed?
It’s suitable for protecting three-phase circuits in commercial and industrial boards carrying medium-duty resistive loads.
How does a B Curve differ from C or D?
B Curve trips at 3–5x rated current. C Curve trips at 5–10x In for inductive circuits, while D Curve trips at 10–20x In for high inrush equipment.
Why 10kA breaking capacity?
It ensures the breaker can interrupt high fault currents safely, common in commercial and industrial installations.
Is the WKC320B bi-directional?
Yes — it can be wired from either the top or bottom to suit the board layout.
Is it suitable for EV and PV installs?
Yes — it’s widely used in EV charge points and solar distribution boards.
- Product Code: WKC320B
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 20A
- 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
Fit into a DIN rail consumer unit or distribution board. Select curve based on load:
- B Curve: resistive loads (lighting, socket outlets)
- C Curve: inductive loads (motors, HVAC, EV chargers)
- D Curve: heavy inrush loads (transformers, welders)
Ensure 10kA breaking capacity matches the site’s fault level. All work must comply with BS 7671 and be installed by a qualified electrician.
