TR400R – GOULD 400A 600V CLASS RK5 TIME DELAY FUSE

The TR400R uses a Class RK5 form factor, which fits any UL-listed Class RK5 or Class H fuse holder rated for 400A at 600V. Class RK5 holders have a rejection feature that prevents the installation of lower-rated Class H fuses, offering an added layer of protection. Always verify your holder's ampere and voltage rating before installation.

Yes. The TR400R's time delay characteristic makes it well-suited for motor branch-circuit and feeder protection, as it tolerates the high inrush current during motor start-up without nuisance blowing. Its 200kA interrupting rating also provides robust short-circuit protection in industrial environments. Confirm your motor's FLA and locked-rotor current to ensure the 400A rating is appropriate for your application.

The Gould TR-series is now part of the Ferraz Shawmut / Mersen product line. Equivalent Class RK5 time delay replacements from other manufacturers include the Bussmann FRN-R-400 (600V, Class RK5). Always confirm the replacement matches all three key parameters: Class RK5, 400A, 600V, and time delay rating. Northern Breaker Group specializes in hard-to-find and obsolete fuses — contact us if you need help sourcing the exact part.