High-speed fuse provides power semiconductor protection

13th May 2021
Mick Elliott

The miniaturisation of electronic components with a simultaneous increase in power, means power semiconductors in particular are more sensitive to overcurrent conditions and voltage pulses.


Littelfuse‘s square case PSR series provides high-speed protection for exactly this application. The Littlefuse PSR series is available at Rutronik UK.

The PSR series is specifically designed to protect power semiconductor devices such as diodes, triacs, IGBTs, SCRs, MOSFETs and other semiconductor elements used for power converter and processing accessories. Fast circuit protection enables this Littlefuse product line to meet the requirements of modern power converters.

These components are used in variable frequency drives, inverters, UPS, rectifiers and soft starters, which are found, for example, in the pulp and paper industry, cranes and heavy-duty accessories, the manufacturing industry or wastewater treatment plants.

However, battery protection applications in energy storage systems, charging stations for e-vehicles or heating and power supply systems also benefit from high-speed fusing.

Littelfuse says the PSR series offers best DC class performance and boasts extremely current limiting and excellent cycling capability.

The components are designed for low watt loss and have global certification (cURus, CCC, IEC) and class-aR performance

according to IEC60269-4.

A visual microswitch indication for blown fuses is optional.

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