WKC 3 Pole 10kA MCB – 63A D Curve (WKC363D)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC363D 3 Pole 10kA MCB is the largest in the D Curve range, rated at 63A for heavy-duty three-phase circuits. With a 10kA breaking capacity, it provides reliable protection against overloads and short-circuits in circuits with very high inrush currents. Typical applications include welders, large motors, compressors, and transformers...
The WKC363D 3 Pole 10kA MCB is the largest in the D Curve range, rated at 63A for heavy-duty three-phase circuits. With a 10kA breaking capacity, it provides reliable protection against overloads and short-circuits in circuits with very high inrush currents. Typical applications include welders, large motors, compressors, and transformers in industrial environments. Fully compliant with BS 7671 (18th Edition), DIN rail mounted, and bi-directional for flexible wiring.
Installer Tip: For 63A circuits, ensure the site fault level supports a 10kA breaker. If your load is resistive or only moderately inductive, consider the B Curve or C Curve alternatives.
Key Features
- 63A rated current – largest model in the WKC range
- D Curve tripping: 10–20x In, designed for heavy inrush loads
- 10kA breaking capacity – protects against high short-circuit currents
- 3 Pole design: safeguards all three live phases
- Bi-directional: can be connected top or bottom
- Applications: transformers, welders, compressors, industrial motors
Compare 63A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC363B | B Curve | 63A | 10kA |
| WKC363C | C Curve | 63A | 10kA |
| WKC363D (This Product) | D Curve | 63A | 10kA |
What’s the WKC363D used for?
Heavy-duty 63A three-phase circuits with very high inrush demand — welders, transformers, compressors, and industrial motors.
How does the D Curve compare with B and C?
B Curve is for resistive loads (3–5x In), C Curve suits inductive loads (5–10x In), while D Curve trips at 10–20x In for very high inrush loads.
What does 10kA breaking capacity mean?
It’s the maximum fault current the breaker can safely clear — making it suitable for commercial and industrial distribution boards.
Is the WKC363D bi-directional?
Yes — like the rest of the WKC series, it can be wired from either top or bottom terminals.
Can it be used in EV or solar installs?
No — D Curve breakers are not generally used in EV/PV installs. They’re designed for heavy-duty machinery with high inrush demand.
- Product Code: WKC363D
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 63A
- Curve: D Curve
- Breaking Capacity: 10kA
- Mounting: DIN rail, 18mm per module
- Functions: Overload & short-circuit protection, isolation, switching
- Compliance: BS 7671 (18th Edition)
- Endurance: 4000 mechanical / 2000 electrical operations
- Brand: WCED
Use in industrial boards for high-load equipment with large inrush currents. Curve type guidance:
- B Curve: resistive loads (lighting, sockets)
- C Curve: inductive loads (motors, HVAC, EV chargers)
- D Curve: very high inrush loads (welders, transformers, compressors, heavy motors)
Always ensure installation is in line with BS 7671 and site short-circuit ratings. Installation must be carried out by a qualified electrician.
