6kA MCB – 63A 1 Pole C Curve (WMC163C)

The WMC163C is a 63 A single-pole 6 kA Miniature Circuit Breaker (MCB) designed for large feed and distribution circuits where inrush currents from motors, welders or transformers demand higher tolerance. Its C-curve tripping profile (5–10 × In) provides robust inrush immunity while ensuring rapid disconnection during short-circuits and overloads.

Fully tested to BS EN 60898, the WMC163C fits all Whitecliffe consumer units and standard DIN-rail enclosures. It delivers 6 kA breaking capacity and 20 000 mechanical operations for long-term performance in domestic, commercial and light-industrial environments.

• 63 A rated current with C-curve (5–10 × In) tripping characteristic
• 6 kA breaking capacity at 230/400 V AC
• Single-pole design – 18 mm module width
• DIN-rail mounted for consumer units and distribution boards
• Complies with BS EN 60898 and BS 7671 (18th Edition A2)
• Service life – 20 000 mechanical / 8 000 electrical operations

The WMC163C delivers 6 kA fault protection for main feeds and distribution circuits. For standard resistive loads, choose a B Curve MCB; for added earth-fault protection, use our Type A RCBOs.

• Part Code: WMC163C
• Type: Single Pole MCB
• Rated Current (In): 63 A
• Curve: C (5–10 × In tripping characteristic)
• Rated Voltage (Ue): 230/400 V AC
• Rated Frequency: 50/60 Hz
• Breaking Capacity (Icn): 6 kA
• Insulation Voltage (Ui): 500 V
• Impulse Withstand (Uimp): 4 kV
• Dielectric Test Voltage: 2 kV for 1 minute
• Thermal Reference Temp: 30 °C
• Operating Temperature: –5 °C to +40 °C (avg < 35 °C)
• Mechanical Life: 20 000 operations
• Electrical Life: 8 000 operations
• Mounting: 35 mm DIN rail (1 module width)
• Standards: BS EN 60898; BS 7671:2018 (Amendment 2)
• Typical Applications: Main feeds, distribution boards and plant circuits with high inrush current

Install the WMC163C in a suitable consumer unit or distribution board by a qualified electrician. Ensure the rating and curve type match the circuit design and upstream device.

• Mount securely on 35 mm DIN rail with correct busbar alignment
• Use C-curve for motors, transformers and distribution feeds
• Verify Z_s and voltage drop meet BS 7671 limits
• Tighten terminals to manufacturer torque spec and log test results

Where is a 63 A C Curve MCB used?

Typically on main feeds or distribution circuits supplying large equipment or sub-boards with motors or transformers present.

Is the WMC163C compatible with Whitecliffe boards?

Yes – it fits all Whitecliffe consumer units and standard DIN-rail enclosures.

Can this MCB protect industrial equipment?

Yes, for light-industrial use within a 6 kA fault-level environment. For heavier industrial systems, see our 10 kA range.

What does the C Curve mean?

It trips between 5–10 × In, allowing for motor and transformer inrush without false tripping.

Do you stock D Curve variants?

Yes – Type D (10–20 × In) versions for industrial and transformer circuits are available on request.