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UL Class Fuses

UL Class Fuses

These fuses meet specific physical specifications and performance criteria defined by UL (Underwriters Laboratories) in UL Standard 248. They come in a variety of amperage ratings.

UL Class RK1 Fuses

Made to protect electrical circuits with a high current, UL Class RK1 fuses have a higher interrupt rating than any other UL Class fuse.

250V AC/125V DC Voltage

Time Delay

250V AC/DC Voltage

Fast Acting

Time Delay

600V AC Voltage

Fast Acting

600V AC/300V DC Voltage

Time Delay

UL Class RK5 Fuses

These fuses contain dual elements and are designed to limit the current under short-circuit conditions, although less so than UL Class RK1 fuses. They are compatible for use with rejection fuse blocks and holders, which have a safety feature that keeps people from unintentionally inserting the wrong type of fuse.

250V AC/125V DC Voltage, Time Delay

250V AC/DC Voltage, Time Delay

600V AC/250V DC Voltage, Time Delay

600V AC/300V DC Voltage, Time Delay

UL Class H Fuses with Replaceable Elements

These UL Class H fuses feature a fuse element that can be replaced once it blows. The interrupt rating is the lowest among fuses of this size.

250V AC Voltage, Time Delay

250V AC/125V DC Voltage, Fast Acting

600V AC Voltage, Fast Acting

600V AC Voltage, Time Delay

UL Class J Fuses

Ideal for tight spaces, these fuses are smaller than UL Class RK1 fuses.

600V AC Voltage, Fast Acting

600V AC/300V DC Voltage, Time Delay

600V AC/450V DC Voltage, Fast Acting

UL Class K5 Fuses

Best suited for electrical circuits without temporary spikes in current, these fuses have a lower interrupt rating than Class RK, Class J, or Class T fuses. They are fast acting to open the current quickly upon overload to prevent fires or damage.

250V AC/125V DC Voltage, Fast Acting

600V AC Voltage, Fast Acting

UL Class L Fuses

UL Class L fuses are suitable for high-current applications, such as protecting circuits in power distribution systems.

600V AC Voltage, Fast Acting

600V AC Voltage, Time Delay

600V AC/300V DC Voltage, Time Delay

UL Class T Fuses

Suitable where space is extremely limited, these UL Class T fuses are smaller than UL Class J fuses.

300V AC Voltage, Fast Acting

300V AC/160V DC Voltage, Fast Acting

300V AC/170V DC Voltage, Fast Acting

600V AC Voltage, Fast Acting

600V AC/300V DC Voltage, Time Delay

UL Class CC Midget Fuses

These fuses are smaller than UL Class RK fuses and have a higher interrupt rating than UL Class G fuses, making them suitable for branch circuits with a higher current. Their mounting configuration makes them compatible with rejection fuse blocks and holders, which are designed to prevent people from mistakenly using the wrong type of fuse, which can cause a safety hazard.

600V AC Voltage, Fast Acting

600V AC Voltage, Time Delay

600V AC/150V DC Voltage, Time Delay

600V AC/300V DC Voltage, Time Delay

UL Class G Midget Fuses

Similar in size to UL Class CC fuses but with a lower interrupt rating, these 13/32" x 1-1/2" midget fuses are suitable for protecting branch circuits in power distribution systems.

480V AC/300V DC Voltage, Time Delay

600V AC/170V DC Voltage, Fast Acting

600V AC/170V DC Voltage, Time Delay