What is Class T Fuse?

The Class T fuse stands out as a rapid-response current limiting fuse designed to handle a minimum of 200,000 amps, ensuring robust interruption capabilities. Available in both 300 volt AC and 600 volt AC variations, these fuses cover a wide spectrum of electrical applications. Ranging from 1 to 800 amps, their ampere ratings offer versatility across different power needs.

One of the remarkable features of the Class T Fuse is its compact size, occupying only about one-third of the space required by a comparable Class R fuse. This space efficiency doesn’t compromise its performance, though. Classified under UL 248-15, Class T, and certified by CSA, these fuses uphold stringent safety standards.

Several reputable brands offer the Class T fuse, each with its unique attributes. Bussmann’s T-Tron line, for instance, showcases current-limiting and fast-acting fuses renowned for their superior 10X current limitation, crucial in preventing equipment damage resulting from short-circuit events. Their 200 kA interrupting rating adheres to NEC Section 110.9, catering to the demands of modern high-capacity systems.

Bussmann further diversifies its Class T fuse offerings with the JJS series (300VAC, 1-1200A, Fast Acting Fuse) and the JJN series (600VAC, 1-800A, Fast Acting Fuse), both embodying the defining traits of current-limiting fuses.

Littelfuse presents its Class T fuses under the POWR-T brand, showcasing models like the JLLS and JLLN fuses, contributing their own technological advancements and safety features.

Mersen, known for its Amp-Trap brand, contributes to the Class T fuse range with models A3T and A6T, incorporating their expertise and precision engineering into these fuses.

These Class T fuses, whether from Bussmann, Littelfuse, or Mersen, signify a commitment to innovation and safety, ensuring a high degree of current limitation during short-circuit scenarios to safeguard critical electrical components.

What are class T fuses used for?

Class T fuses serve as fast-acting semiconductor fuses primarily employed in DC applications. Their core purpose revolves around safeguarding sensitive equipment, notably inverters, against electrical faults. With sizes available up to 1200 Amps and an exceptionally high interrupt rating, these fuses are well-suited to serve as primary circuit protection for substantial battery banks.

Their rapid response and high interrupting capabilities make them a reliable choice for protecting sophisticated and delicate electronic devices. The Class T fuse's design and specifications align with the critical need to prevent damage to inverters and other vulnerable components in the event of electrical faults or short circuits within DC systems.

Class T Fuse Cross Reference (Bussmann, Littelfuse, Mersen)

300V Class T Fuse Cross Reference

600V Class T Fuse Cross Reference