50A 4 Pole 10kA MCB D Curve – WKC450D
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC450D is a 50A 4 pole 10kA Miniature Circuit Breaker (MCB) engineered for three-phase + neutral protection. Its D Curve trip profile is designed for very high inrush loads such as welders, heavy-duty motors, compressors, transformers, and industrial machinery. Typical use includes industrial distribution panels, solar PV systems, and...
The WKC450D is a 50A 4 pole 10kA Miniature Circuit Breaker (MCB) engineered for three-phase + neutral protection. Its D Curve trip profile is designed for very high inrush loads such as welders, heavy-duty motors, compressors, transformers, and industrial machinery. Typical use includes industrial distribution panels, solar PV systems, and EV charging infrastructure.
With a 10kA breaking capacity, the WKC450D delivers reliable overload and short-circuit protection while isolating all three phases and the neutral. It is DIN-rail mountable, bi-directional, and manufactured to BS 7671 (18th Edition) standards.
Installer Tip: The 50A D Curve breaker is well-suited for high-demand industrial setups, including large motor drives and heavy machinery. Always confirm system fault current ≤10kA before installation.
Key Features
- 50A 4 Pole MCB – D Curve trip characteristic
- 10kA breaking capacity – protection for heavy industrial fault levels
- Four-pole isolation: protects L1, L2, L3 + Neutral
- Bi-directional feed: install from top or bottom
- DIN-rail mounting: 18mm per pole
- Meets BS 7671 (18th Edition)
Compare WKC 4 Pole 10kA MCBs (D Curve)
| Model | Rating | Curve | Breaking Capacity |
|---|---|---|---|
| WKC440D | 40A | D Curve | 10kA |
| WKC450D (This Product) | 50A | D Curve | 10kA |
| WKC463D | 63A | D Curve | 10kA |
What is the WKC450D used for?
It’s commonly used in industrial setups with very high inrush loads such as welders, heavy motors, compressors, and large transformers.
Why use a D Curve breaker instead of C Curve?
D Curve breakers are designed for circuits with extreme inrush currents, avoiding nuisance tripping in heavy-duty applications.
Can the WKC450D be used in EV or PV systems?
Yes — it is suitable for industrial EV charging and PV circuits, provided the system fault current ≤10kA.
Does this product comply with regulations?
Yes, the WKC450D meets BS 7671 (18th Edition) and IEC/EN 60898-1 standards.
- Model: WKC450D
- Type: Miniature Circuit Breaker (MCB)
- Current Rating: 50A
- Curve: D 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)
- Compliance: BS 7671 (18th Edition), IEC/EN 60898-1
- Brand: WCED
The WKC450D must be installed by a qualified electrician under BS 7671 wiring standards.
- DIN rail mounting (18mm per pole)
- Ensure system fault level ≤10kA
- Best for heavy inrush load circuits (D Curve)
- Tighten terminals to manufacturer’s torque spec
- Allow panel space for 4P breakers
