EMC & Circuit Protection
Buying semiconductor fuses for power converters: key considerations, applications and benefits of working with a trusted distributor
Paul Bentley, managing director of GD Rectifiers, discusses why partnering with an experienced distributor like GD Rectifiers can streamline the procurement process
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n the fast-moving world of power electronics, reliability is key. Whether you’re designing an industrial drive, a renewable energy inverter, or a high- voltage DC power supply, the fuse you choose can be the difference between a minor hiccup and catastrophic equipment failure. Semiconductor fuses, also referred to as high-speed or ultra-fast fuses are specifically engineered to protect sensitive power semiconductors such as IGBTs, MOSFETs,
16 September 2025
thyristors and diodes in the event of a short circuit or overload.
When it comes to sourcing these components for power converters, engineers and buyers need to balance technical performance, cost, availability and supply chain security.
The role of semiconductor fuses in power converters
Power converters operate by switching Components in Electronics
high currents and voltages at rapid speeds. Semiconductor devices within them are inherently sensitive to overcurrent conditions, which can occur due to component failure, wiring faults or external disturbances. Unlike general-purpose fuses, semiconductor fuses are designed with very low I²t (melting energy) ratings and high interrupting capacities. This allows them to react in microseconds, clearing faults before damaging expensive power devices.
Key considerations when selecting a semiconductor fuse 1. Current rating
Always select a fuse with a continuous current rating that matches or slightly exceeds your converter’s normal operating current. Over-sizing may compromise protection; under-sizing can lead to nuisance trips.
2. Voltage rating The fuse’s voltage rating must meet or exceed
www.cieonline.co.uk
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