20A 4 Pole 10kA MCB D Curve – WKC420D
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC420D is a 20A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its D Curve trip characteristic, it is suited to high inrush load circuits such as welders, transformers, heavy motors, and industrial machinery. Typical use includes commercial distribution panels, solar PV setups,...
The WKC420D is a 20A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its D Curve trip characteristic, it is suited to high inrush load circuits such as welders, transformers, heavy motors, and industrial machinery. Typical use includes commercial distribution panels, solar PV setups, and EV charging systems.
Tested to a 10kA breaking capacity, the WKC420D provides short-circuit and overload protection while isolating all three phases and neutral. It is DIN-rail mountable, bi-directional, and compliant with BS 7671 (18th Edition).
Installer Tip: Use the 20A D Curve breaker for machinery and motor circuits with very high start-up currents. Always verify prospective fault level ≤10kA.
Key Features
- 20A 4 Pole MCB – D Curve trip profile
- 10kA breaking capacity – withstands heavy industrial fault currents
- Four-pole isolation: L1, L2, L3 + Neutral
- Bi-directional feed: install from top or bottom
- DIN-rail mounted: 18mm width per module
- Complies with BS 7671 (18th Edition)
Compare WKC 4 Pole 10kA MCBs (D Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC416D | 16A | D Curve | 10kA |
| WKC420D (This Product) | 20A | D Curve | 10kA |
| WKC425D | 25A | D Curve | 10kA |
| WKC432D | 32A | D Curve | 10kA |
What applications is the WKC420D suited for?
It is commonly used for welders, transformers, and machinery circuits with very high inrush currents.
Why use a D Curve breaker over C Curve?
D Curve models tolerate much higher inrush currents than C Curve, avoiding nuisance tripping on industrial loads.
Can the WKC420D be used in EV charging systems?
Yes — particularly for industrial EV charging setups or boards with heavy-duty equipment, provided fault levels ≤10kA.
Is the WKC420D compliant with UK standards?
Yes, it complies with BS 7671 (18th Edition) and IEC/EN 60898-1.
- Model: WKC420D
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 20A
- Curve: D Curve
- Poles: 4P (L1, L2, L3 + Neutral)
- Breaking Capacity: 10kA
- Mounting: 35mm DIN rail, 18mm per pole
- Dimensions: Approx. 72mm (W) x 90mm (H) x 77mm (D)
- Compliance: BS 7671 (18th Edition), IEC/EN 60898-1
- Brand: WCED
The WKC420D must be installed by a qualified electrician under BS 7671 wiring standards.
- DIN rail mounting (18mm per pole)
- Check that system fault current ≤10kA
- Suited for heavy inrush load circuits (D Curve)
- Torque terminals to recommended spec
- Ensure sufficient space in panel for 4P breakers
