A new FXP Fuseholder for very high power

9th June 2023

Schurter AG

Kristian McCann

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Closed fuse holders are a fine thing: the fuse is well protected and yet easy to replace. According to IEC-60127-6, however, the limit was previously 16A.

Thanks to an extension of this standard initiated by SCHURTER, this is now history. The new FXP fuse holder for 6.3x32 fuse links is designed for rated currents up to 25A (IEC) or 45A (UL).

The new SCHURTER FXP fuse holder for 6.3x32 fuses has been explicitly designed for high-power applications. Its nominal data is an impressive proof: according to IEC, the rating is 25A @ 500VAC (8 watts) or UL 45A 600VAC/VDC. This makes it the first fuse holder that already fulfils the upcoming extension of the IEC standard 60127-6.

Derating at high ambient temperatures

What makes the FXP particularly interesting is its high current capability in use at elevated temperatures. The IEC and UL ratings are always based on normal conditions. In the case of a fuse holder, this means +23 °C (IEC) or +25 °C (UL). If a fuse holder is used above these temperatures, its capacity decreases with increasing temperature. The FXP fuse holder still achieves a maximum power of 4 watts even at 50°C ambient temperature. Today's fuse holders of similar size only achieve such values at room temperature. This circumstance creates safety reserves at increased operating temperatures.

Efficient mounting

Thanks to snap-in mounting technology, the FXP is ready for use in no time. With its IP40 protection class, it is primarily designed for indoor applications. A solder connection is available on the connection side.