Cylindrical fuse insert CH-22 22x58mm aM 63A 500VAC LF563M

Protection of motor circuits with high inrush currents

The 22x58 mm fuse link with a rated current of 63 A is a key component in installations featuring electric motor-driven equipment. Its primary function is short-circuit protection, not long-term overload protection. Thanks to its aM characteristic (partial breaking capacity), this element enables safe starting of motors that generate high inrush currents. Under normal operating conditions, even with several-fold exceedances of the rated current during startup, the fuse link remains intact. Only in the event of a short circuit does it provide fast and reliable circuit interruption, protecting expensive motor windings and wiring from damage.

Ceramic construction and operating parameters

The unit is constructed from ceramic, ensuring high thermal and mechanical resistance in demanding environmental conditions. It is designed for operation in AC networks with a voltage up to 500 V and a frequency of 50–60 Hz. A key parameter for the installer is the breaking capacity of up to 80 kA, meaning the fuse link can safely interrupt very high short-circuit currents without risk of explosion or damage to adjacent installation components. Attention should be paid to power losses, which at rated current amount to approximately 4.46 W. This means that during continuous operation under full load, the element will heat up – a typical value for fuses of this type, requiring consideration when designing switchboard ventilation.

Application and installation in Hager systems

This product is ideally suited for industrial switchboards and installations serving pumps, fans, or conveyor belts. Installation is carried out in standard cylindrical fuse holders compatible with the 22x58 mm size. It should be noted that, due to the specific nature of the aM characteristic, the fuse link does not replace an overcurrent circuit breaker protecting against overloads – its role is exclusively the rapid disconnection of short circuits.

It is worth noting that the device operates within a voltage range of 500 V AC and has a short-circuit withstand capability of up to 80 kA. At full load of 63 A, power losses amount to 4.46 W, affecting the thermal balance within the enclosure. Physical dimensions of 22 x 58 mm ensure compatibility with most standard cylindrical fuse holders used in modern switchboards. The aM characteristic is crucial here – it allows the fuse to ignore short-term current surges typical of motor starting, responding only to genuine short circuits.

Thanks to precise manufacturing and compliance with IEC 60269 standard (aM category), the LF563M fuse link guarantees reliable operation in circuits requiring tolerance to current surges during motor startup.