AJT90 – GOULD 90A 600V CLASS J TIME DELAY FUSE

A time-delay (dual-element) Class J fuse like the GOUAJT90 can handle temporary overloads — such as motor inrush current on startup — without nuisance blowing, while still providing fast, current-limiting protection on a true short circuit. A fast-acting Class J fuse would blow on those same harmless inrush events. For motor branch circuits and transformer primaries, a time-delay fuse is almost always the correct choice.

Yes — Class J is a standardised UL/CSA fuse class, so the GOUAJT90 is dimensionally and electrically interchangeable with equivalent time-delay Class J fuses from other manufacturers (e.g., Bussmann LPJ-90SP, Ferraz Shawmut/Mersen AJT90, Littelfuse JLLS090) provided the amperage (90A), voltage (600V), and time-delay characteristic all match. Always verify the replacement meets the same interrupting rating (typically 200kA for Class J) required by your installation.

Gould's AJT series fuses are considered a legacy/obsolete line following Gould's acquisition into the Ferraz Shawmut / Mersen family. New old-stock (NOS) and surplus units can be difficult to locate. Northern Breaker Group specialises in hard-to-find and obsolete electrical components across Canada — contact our Calgary, Edmonton, or Vancouver counters or request a quote and we'll track down the stock you need.