WKC 3 Pole 10kA MCB – 25A D Curve (WKC325D)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC325D 3 Pole 10kA MCB is a 25A D Curve breaker designed for heavy-duty three-phase circuits with high inrush currents. With a 10kA breaking capacity and compliance with BS 7671 (18th Edition), it ensures safe disconnection under overload and short-circuit conditions. Built for demanding applications, it is ideal for...
The WKC325D 3 Pole 10kA MCB is a 25A D Curve breaker designed for heavy-duty three-phase circuits with high inrush currents. With a 10kA breaking capacity and compliance with BS 7671 (18th Edition), it ensures safe disconnection under overload and short-circuit conditions. Built for demanding applications, it is ideal for welders, transformers, compressors, and heavy industrial motors where standard B or C Curve MCBs would trip unnecessarily.
Installer Tip: D Curve breakers trip at 10–20x In and should only be specified where high inrush currents are expected. For resistive loads, see the B Curve. For inductive loads with moderate inrush, use the C Curve.
Key Features
- 25A rated current – protects medium three-phase high inrush circuits
- D Curve tripping – trips at 10–20x In
- 10kA breaking capacity – safe fault interruption
- 3 Pole design: full three-phase protection
- Bi-directional: allows wiring from top or bottom
- Applications: welders, transformers, compressors, heavy machinery
Compare 25A 3 Pole Variants
| Model | Curve | Rated Current | Breaking Capacity |
|---|---|---|---|
| WKC325B | B Curve | 25A | 10kA |
| WKC325C | C Curve | 25A | 10kA |
| WKC325D (This Product) | D Curve | 25A | 10kA |
Where is the WKC325D best used?
In three-phase circuits with high inrush demand, including welders, compressors, large motors, and transformers.
How does D Curve compare with B and C?
B Curve trips at 3–5x In for resistive loads, C Curve trips at 5–10x In for inductive loads, and D Curve trips at 10–20x In for heavy plant and machinery.
What does 10kA breaking capacity mean?
It’s the maximum short-circuit current the breaker can safely interrupt, making it suitable for commercial and industrial distribution boards.
Is the WKC325D bi-directional?
Yes — it can be connected from either top or bottom terminals.
Is this breaker suitable for EV or PV systems?
No — EV and PV systems generally require B or C Curve devices. D Curve is designed for industrial high inrush circuits.
- Product Code: WKC325D
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3P (three-phase)
- Rated Current: 25A
- Curve: D Curve
- Breaking Capacity: 10kA
- Mounting: DIN rail, 18mm per module
- Functions: Overload & short-circuit protection, switching, isolation
- Compliance: BS 7671 (18th Edition)
- Endurance: 4000 mechanical / 2000 electrical operations
- Brand: WCED
Designed for use in commercial and industrial distribution boards. Curve selection guidance:
- B Curve: resistive circuits (lighting, sockets)
- C Curve: inductive circuits with moderate inrush (motors, HVAC)
- D Curve: heavy inrush loads (welders, compressors, transformers)
Always confirm the site’s prospective fault current is within the 10kA rating. Installation must comply with BS 7671 and be completed by a qualified electrician.
