6kA MCB – 6A 1 Pole B Curve (WMC106B)

The WMC106B is a 6A single-pole 6kA Miniature Circuit Breaker (MCB) designed to provide reliable overcurrent and short-circuit protection on domestic and light-commercial lighting circuits. Rated for 230/400 V AC operation, it features a B-curve tripping characteristic that reacts at 3–5 × rated current - ideal for standard lighting and socket circuits with low inrush.

Fully compliant with BS EN 60898 and suitable for use in Whitecliffe consumer units and most DIN-rail enclosures, this breaker offers consistent tripping performance and a service life tested to 20,000 mechanical operations.

• 6 A rated current with B-curve tripping (3–5 × In)
• 6 kA breaking capacity at 230/400 V
• Single-pole design (18 mm module width)
• DIN-rail mounted – fits standard consumer units and distribution boards
• Complies with BS EN 60898 and BS 7671 (18th Edition A2)
• Long mechanical life – 20 000 operations
• Electrical life – 8 000 operations

The WMC106B offers reliable 6kA protection for lighting and socket circuits in any BS EN 60898-compliant installation. For higher inrush loads or motor circuits, see our C Curve MCB range or combine with our Type A RCBOs for combined overcurrent and earth-fault protection.

• Part Code: WMC106B
• Type: Single Pole MCB
• Rated Current (In): 6 A
• Curve: B (3–5 × 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 Voltage (Uimp): 4 kV
• Dielectric Test Voltage: 2 kV for 1 minute
• Thermal Reference Temp: 30 °C
• Operating Temperature: -5 °C to +40 °C (daily 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: Lighting circuits, small socket radials, domestic distribution boards

Install the WMC106B MCB only in suitable enclosures and consumer units by a qualified electrician. Match the rating and curve to the circuit design for compliance with BS 7671.

• Ensure secure DIN-rail mounting and correct busbar alignment
• Select B-curve for standard lighting and socket circuits
• Confirm rated current (6 A) suits design load and protective coordination
• Use Type C MCBs for circuits with higher inrush currents (e.g. motors or EV chargers)
• Check tightness of terminals and record results on EIC test sheets

What does 6 kA mean on this MCB?

It indicates the breaker’s rated breaking capacity – the maximum fault current it can safely interrupt. For higher fault-level installations, see our 10 kA MCB range.

Where should a 6 A B Curve MCB be used?

B-curve 6 A MCBs are suited to lighting circuits and general domestic outlets with low inrush currents. They provide fast fault disconnection without nuisance tripping.

Are these compatible with Whitecliffe consumer units?

Yes – the WMC106B is fully compatible with Whitecliffe consumer units and fits any standard 18 mm DIN rail enclosure.

Can I use this MCB in a garage board or outbuilding?

Yes, provided the enclosure is rated for the environment (e.g. IP65 for outdoor use). Pair with our IP65 plastic enclosures for weather-protected installs.

Do you stock other curve types?

Yes – our C Curve MCBs and special-order D Curve MCBs cover higher inrush and industrial applications. Select the curve type that matches your circuit design.