A3T800 – GOULD 800A 600V CLASS T FAST ACTING FUSE

Class T, Class L, and Class J fuses are entirely different form factors with rejection features specifically designed to prevent cross-installation. The A3T800 is a Class T fast-acting fuse with its own unique dimensions and holder requirements. It cannot be installed in a Class L or Class J holder, and vice versa. Always verify your fuse holder or disconnect switch is rated and labelled for Class T fuses before ordering.

The Gould A3T series was produced under the Gould Shawmut brand, which transitioned to Mersen (Ferraz Shawmut). Availability of the original Gould-branded A3T800 can vary, but Northern Breaker Group specialises in obsolete and hard-to-find fuses. Direct Class T equivalents such as the Bussmann JJS-800 or Littelfuse JLLN-800 are electrically and dimensionally interchangeable. Contact us and we'll help source the right option for your application.

The A3T800 is suited for industrial and commercial applications requiring high-speed overcurrent protection, including feeder and service entrance protection, busway tap protection, and branch circuits for large motors or transformers. Its 200kA interrupting rating makes it appropriate for installations with high available fault current — common in commercial buildings, manufacturing facilities, and utility service points across Canada.