50A 2 Pole 10kA MCB – D Curve (WKC250D)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WKC250D is a 50 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) built for demanding circuits with high inrush current — including plant machinery, HVAC systems, and large motor or pump feeds. The D-curve tripping profile allows 10–20× rated current during energisation, providing stable protection for inductive loads...
The WKC250D is a 50 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) built for demanding circuits with high inrush current — including plant machinery, HVAC systems, and large motor or pump feeds. The D-curve tripping profile allows 10–20× rated current during energisation, providing stable protection for inductive loads without nuisance tripping.
Its dual-pole isolation safely disconnects both live conductors simultaneously, in full compliance with BS EN 60898-1 and 18th Edition Wiring Regulations. Compact 36 mm body fits standard 35 mm DIN rails in industrial enclosures, distribution boards, and consumer units.
Installer Tip: A 50 A D-curve MCB is suited for heavy-duty control panels, motor circuits, and HVAC plant where inrush currents are substantial. For more moderate applications, see the C-curve model.
Key Features
- 50 A rated – ideal for heavy-duty industrial and HVAC circuits
- 10 kA breaking capacity – withstands commercial and industrial fault levels
- 2-pole isolation – disconnects both live conductors simultaneously
- D-curve tripping – tolerates high inrush up to 20× rated current
- Bi-directional terminals – allows top or bottom feed
- 36 mm (2-module) DIN-rail format
- Certified to IEC/EN 60898-1 for 18th Edition compliance
Compare 2 Pole 10 kA MCB Variants
| Model | Rating | Curve |
|---|---|---|
| WKC250B | 50 A | B Curve |
| WKC250C | 50 A | C Curve |
| WKC250D (This Product) | 50 A | D Curve |
What is a 50 A D-curve MCB used for?
Typically installed in industrial or commercial plant rooms, HVAC systems, or control panels with heavy inductive loads.
Does it isolate both live conductors?
Yes – 2-pole design disconnects both live lines simultaneously for complete isolation and safety.
Can it be used for HVAC systems?
Yes – it’s a popular choice for high-capacity HVAC and compressor circuits where startup current is high.
Is it BS EN 60898-1 compliant?
Yes – certified to BS EN 60898-1 and compliant with the 18th Edition Wiring Regulations.
- Model: WKC250D
- Poles: 2
- Rated Current: 50 A
- Curve Type: D
- Breaking Capacity: 10 kA
- Operating Voltage: 230/400 V AC
- Mounting: 35 mm DIN rail (EN 60715)
- Width: 36 mm (2 modules)
- Standard: IEC/EN 60898-1
- Applications: Plant rooms, HVAC equipment, industrial control systems
Install by a qualified electrician in line with BS 7671. Verify that connected equipment requires D-curve protection and check cable size, breaker rating, and insulation resistance before energising.
- Mount securely on 35 mm DIN rail (EN 60715)
- Torque terminals to 2.0–2.5 Nm
- Check insulation resistance and polarity before connection
- Label and document protected circuits within distribution board schedule
