6kA MCB – 50A 1 Pole C Curve (WMC150C)

The WMC150C is a 50 A single-pole 6 kA Miniature Circuit Breaker (MCB) providing reliable overcurrent and short-circuit protection for feed circuits, plant equipment and sub-boards with moderate-to-high inrush currents. Its C-curve tripping characteristic (5–10 × In) handles motor and transformer surges without nuisance tripping while ensuring rapid fault clearing under BS 7671.

Tested to BS EN 60898 and compatible with Whitecliffe consumer units, the WMC150C delivers a 6 kA breaking capacity and 20 000-cycle mechanical life. Ideal for domestic or light-industrial feed and distribution circuits requiring robust inrush-resilient protection.

• 50 A rated current with C-curve (5–10 × In) tripping profile
• 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 WMC150C provides 6 kA protection for feed and plant circuits in domestic and light-industrial environments. For resistive loads use a B Curve MCB, or choose Type A RCBOs to add earth-fault protection.

• Part Code: WMC150C
• Type: Single Pole MCB
• Rated Current (In): 50 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: Feed and plant equipment circuits, sub-boards and distribution feeds with moderate-to-high inrush

Install the WMC150C in a suitable consumer unit or distribution board by a qualified electrician. Match the MCB rating and curve to the circuit design and expected load.

• Mount securely on 35 mm DIN rail and ensure busbar alignment
• Use C-curve for motors, compressors and feed circuits with inrush
• Check Z_s and voltage drop against BS 7671 limits
• Tighten terminals to manufacturer torque values and log test results

Where is a 50 A C Curve MCB used?

Typically on feed circuits or plant equipment with motors or transformers that draw higher startup currents.

Is the WMC150C compatible with Whitecliffe boards?

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

Can this breaker feed a sub-board or industrial machine?

Yes, provided the fault level does not exceed 6 kA and the cables are rated for the load. For higher fault environments, see our 10 kA MCBs.

What does C Curve mean on an MCB?

It trips between 5–10 × the rated current (In), making it ideal for circuits with motors or transformers that produce brief inrush currents.

Do you supply D Curve versions?

Yes – Type D (10–20 × In) devices are available on request for industrial loads with very high inrush currents.