40A 4 Pole 10kA MCB C Curve – WKC440C
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
Secure Payments With
The WKC440C is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its C Curve trip profile, it is built for inductive load circuits such as motors, pumps, HVAC systems, EV chargers, and commercial lighting in three-phase boards, EV installations, and solar PV...
The WKC440C is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its C Curve trip profile, it is built for inductive load circuits such as motors, pumps, HVAC systems, EV chargers, and commercial lighting in three-phase boards, EV installations, and solar PV setups.
Rated to 10kA breaking capacity, the WKC440C provides safe overload and short-circuit protection while ensuring complete neutral isolation. It is DIN-rail mounted, bi-directional, and compliant with BS 7671 (18th Edition).
Installer Tip: A 40A C Curve is widely used for larger inductive loads such as HVAC compressors, pumps, and EV distribution panels. Ensure that prospective fault current does not exceed 10kA.
Key Features
- 40A 4 Pole MCB – C Curve characteristic
- 10kA breaking capacity – robust for commercial & industrial boards
- Neutral isolation: full 4P switching (L1, L2, L3, N)
- Bi-directional feed: install top or bottom
- DIN-rail mounted: 18mm width per pole
- Meets BS 7671 (18th Edition) compliance
Compare WKC 4 Pole 10kA MCBs (C Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC432C | 32A | C Curve | 10kA |
| WKC440C (This Product) | 40A | C Curve | 10kA |
| WKC450C | 50A | C Curve | 10kA |
| WKC463C | 63A | C Curve | 10kA |
What applications is the WKC440C used for?
It’s widely used for HVAC compressors, pumps, and larger inductive loads in commercial and industrial systems.
Why use a C Curve instead of B Curve?
C Curve breakers handle higher inrush currents, making them suitable for inductive loads where B Curve breakers may nuisance trip.
Can this be used for EV charger distribution?
Yes — the 40A C Curve is ideal for EV distribution boards with moderate inrush loads, provided the system fault level ≤10kA.
Does this product meet compliance standards?
Yes, the WKC440C is compliant with BS 7671 (18th Edition) and IEC/EN 60898-1.
- Model: WKC440C
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 40A
- Curve: C 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
The WKC440C must be installed by a qualified electrician in line with BS 7671 regulations.
- Mount on 35mm DIN rail (18mm per pole)
- Ensure prospective fault current ≤10kA
- For inductive/moderate inrush loads (C Curve)
- Tighten terminals to recommended torque
- Allow sufficient space for 4P breakers in the enclosure
