6kA MCB – 32A 1 Pole B Curve (WMC132B)

The WMC132B is a 32 A single-pole 6 kA Miniature Circuit Breaker (MCB) engineered for high-load domestic and light-commercial circuits such as cookers, immersion heaters, and fixed plant. It features a B-curve tripping characteristic that operates at 3–5 × rated current to deliver precise overcurrent and short-circuit protection without nuisance tripping.

Manufactured to BS EN 60898, the WMC132B fits Whitecliffe consumer units and all standard DIN-rail enclosures. It provides 6 kA fault capacity at 230/400 V AC and a tested mechanical life of 20 000 operations for reliable performance over years of use.

• 32 A rated current with B-curve (3–5 × 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 tested: 20 000 mechanical / 8 000 electrical operations
• Contact-position indicator for easy visual status check

The WMC132B delivers dependable 6 kA protection for heavier domestic and light-commercial loads. For circuits with motors or transformer inrush, see our C Curve MCB range or use Type A RCBOs to add earth-fault protection.

• Part Code: WMC132B
• Type: Single Pole MCB
• Rated Current (In): 32 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 (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: Cookers, heaters, immersion circuits, fixed loads and feed circuits in domestic or commercial installations

Fit the WMC132B into a suitable consumer unit or distribution board by a qualified electrician. Match the device rating and curve type to the circuit design and cable capacity.

• Ensure secure DIN-rail mounting and correct busbar alignment
• Use B-curve for standard fixed-load domestic circuits
• Confirm Z_s, voltage drop and cable size are within BS 7671 limits
• Consider C-curve for circuits with higher inrush currents
• Tighten terminals to manufacturer torque values and record test results

When should I use a 32 A B Curve MCB?

Use for high-load domestic circuits such as cookers, immersion heaters and fixed appliances where inrush currents are low. B-curve devices trip at 3–5 × In to provide fast fault protection.

Is the WMC132B compatible with Whitecliffe boards?

Yes – it fits all Whitecliffe consumer units and standard 18 mm DIN-rail enclosures.

Can this breaker protect feed circuits to outbuildings?

Yes, provided the sub-main cable and Z_s values are within BS 7671 limits. For outdoor enclosures, use our IP65 plastic enclosure.

What’s the difference between B and C curve MCBs?

B curve devices trip at 3–5 × In and suit lighting and fixed loads. C curve devices trip at 5–10 × In and are used for motors and transformers with higher inrush.

What does 6 kA mean?

6 kA is the breaker’s rated breaking capacity – the maximum fault current it can safely interrupt without damage. For higher fault-level sites, see our 10 kA MCB range.