6A 4 Pole 10kA MCB D Curve – WKC406D
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC406D is a 6A 4 pole 10kA Miniature Circuit Breaker (MCB) built for three-phase + neutral protection. With its D Curve trip characteristic, it is designed for heavy inrush load circuits such as transformers, welders, large motors, and industrial machinery in commercial boards, industrial installs, and EV charging infrastructure....
The WKC406D is a 6A 4 pole 10kA Miniature Circuit Breaker (MCB) built for three-phase + neutral protection. With its D Curve trip characteristic, it is designed for heavy inrush load circuits such as transformers, welders, large motors, and industrial machinery in commercial boards, industrial installs, and EV charging infrastructure.
Rated to 10kA breaking capacity, the WKC406D provides robust short-circuit and overload protection while isolating all three phases and the neutral. It is DIN-rail mounted, bi-directional, and fully compliant with BS 7671 (18th Edition).
Installer Tip: Select a D Curve breaker where very high inrush currents occur — for example in welding equipment or large motor starts. Always confirm fault level does not exceed 10kA.
Key Features
- 6A 4 Pole MCB – D Curve trip characteristic
- 10kA breaking capacity – handles industrial fault levels
- Four-pole isolation: L1, L2, L3 + Neutral
- Bi-directional feed: top or bottom entry
- DIN-rail mounted: 18mm per module
- Complies with BS 7671 (18th Edition)
Compare WKC 4 Pole 10kA MCBs (D Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC406D (This Product) | 6A | D Curve | 10kA |
| WKC410D | 10A | D Curve | 10kA |
| WKC416D | 16A | D Curve | 10kA |
| WKC420D | 20A | D Curve | 10kA |
When should I use a D Curve breaker?
Choose D Curve devices for heavy inrush loads such as welders, transformers, or large motors where C or B Curves may nuisance trip.
What’s the benefit of 4-pole protection?
It isolates the neutral along with all three phases, ensuring full protection in three-phase + N systems.
Is the WKC406D suitable for EV charging setups?
Yes, if the EV installation includes heavy inrush equipment or industrial charging systems, provided fault levels are ≤10kA.
Does it meet UK regulations?
Yes — it complies with BS 7671 (18th Edition) and IEC/EN 60898-1.
- Model: WKC406D
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 6A
- Curve: D Curve
- Poles: 4P (L1, L2, L3 + Neutral)
- Breaking Capacity: 10kA
- Mounting: 35mm DIN rail, 18mm width per pole
- Dimensions: Approx. 72mm (W) x 90mm (H) x 77mm (D)
- Standards: BS 7671 (18th Edition), IEC/EN 60898-1
- Brand: WCED
The WKC406D must be installed by a qualified electrician in accordance with BS 7671.
- DIN rail mounting (18mm per pole)
- Ensure board fault current ≤10kA
- Designed for high inrush load circuits (D Curve)
- Apply correct tightening torque on terminals
- Check enclosure space for 4P breakers
