Lewden Miniature Circuit Breaker - Triple Pole - 10kA - C Curve

'10kA' refers to the breaking capacity, meaning it can safely interrupt a fault current of up to 10,000 Amperes. 'C Curve' indicates its tripping characteristic, designed to trip between 5 to 10 times the rated current, making it suitable for circuits with moderate inductive loads or inrush currents.

While it might physically fit, this MCB is specifically designed and tested for optimal performance and safety with Lewden branded distribution boards. Compatibility and reliability with other brands are not guaranteed.

C Curve MCBs are for circuits with moderate inrush currents (e.g., small motors, fluorescent lighting). B Curve trips at 3-5 times rated current (e.g., resistive loads like heaters), and D Curve trips at 10-20 times rated current (e.g., large motors, transformers).

For most domestic lighting circuits, a single-pole B Curve MCB is typically used. This triple-pole C Curve MCB is more suited for 3-phase applications or circuits with higher inrush currents.

To reset a tripped MCB, first identify and resolve the cause of the overload or short circuit. Then, push the MCB's lever firmly upwards to the 'ON' position.

This MCB complies with the BS EN 60898-1 standard.

The rated operating voltage is 230-400V~.

The circuit may have a higher inrush current than the C Curve is designed for. Consider if a D Curve MCB is more appropriate for this specific load, or investigate the load itself for faults.

Verify correct wiring and connections. Ensure the MCB is correctly rated for the circuit. If the issue persists, the MCB may be faulty and should be replaced by a qualified electrician.

Ensure the DIN rail is properly installed and secured. Check the mounting clip on the MCB and ensure it is engaging correctly with the rail. Re-seat the MCB firmly.

Identify and rectify the cause of the trip (overload or short circuit). Once the fault is cleared, reset the MCB by pushing the lever fully up.