40A 4 Pole 10kA MCB B Curve – WKC440B
£15.05
ex VAT
£18.06 inc VAT
SKU: WKC440B
The WKC440B is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) for three-phase + neutral circuits. With its B Curve trip characteristic, this breaker is intended for resistive load circuits such as socket outlet banks, small distribution boards, and lighting groups in commercial three-phase systems, EV distribution boards, and...
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Description
The WKC440B is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) for three-phase + neutral circuits. With its B Curve trip characteristic, this breaker is intended for resistive load circuits such as socket outlet banks, small distribution boards, and lighting groups in commercial three-phase systems, EV distribution boards, and solar PV installs.
With a 10kA breaking capacity, the WKC440B delivers safe overload and short-circuit protection while disconnecting all phases and neutral. It is DIN-rail mounted, bi-directional, and manufactured in compliance with BS 7671 (18th Edition).
Installer Tip: The 40A B Curve breaker is a solid choice for larger socket outlet circuits or small commercial distribution boards. Verify that the installation fault current does not exceed 10kA before use.
Key Features
- 40A 4 Pole MCB – B Curve trip characteristic
- 10kA breaking capacity – reliable in commercial & industrial installs
- Full neutral protection: 4P switching (L1, L2, L3, N)
- Bi-directional feed: top or bottom cable entry
- DIN-rail mountable: 18mm width per module
- Complies with BS 7671 (18th Edition)
Compare WKC 4 Pole 10kA MCBs (B Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC432B | 32A | B Curve | 10kA |
| WKC440B (This Product) | 40A | B Curve | 10kA |
| WKC450B | 50A | B Curve | 10kA |
| WKC463B | 63A | B Curve | 10kA |
Technical specs
- Model: WKC440B
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 40A
- Curve: B Curve
- Poles: 4P (L1, L2, L3 + Neutral)
- Breaking Capacity: 10kA
- Mounting: 35mm DIN rail, 18mm per module
- Dimensions: Approx. 72mm (W) x 90mm (H) x 77mm (D)
- Standards: BS 7671 (18th Edition), IEC/EN 60898-1
- Brand: WCED
Installation notes
Installation of the WKC440B must be performed by a qualified electrician in line with BS 7671 wiring regulations.
- Mount on 35mm DIN rail (18mm per pole)
- Ensure fault current ≤10kA
- Designed for resistive loads only (B Curve)
- Tighten terminals to manufacturer torque spec
- Confirm space in enclosure for 4P devices
FAQs
What applications is the WKC440B best for?
It’s suited to larger socket outlet groups and small commercial distribution boards with resistive loads.
Why use a 4-pole MCB instead of 3-pole?
It isolates the neutral as well as all three phases, ensuring full protection in three-phase + N circuits.
Can the WKC440B be used in EV or solar installs?
Yes, where the load is resistive and fault levels are ≤10kA. For inductive loads, choose a C Curve alternative.
Is the WKC440B regulation compliant?
Yes — it complies with BS 7671 (18th Edition) and IEC/EN 60898-1.
