TR80R – GOULD 80A 250V CLASS RK5 TIME DELAY FUSE

Class RK5 and Class RK1 fuses share the same physical dimensions and will fit the same holders, but they are NOT interchangeable for safety purposes. Class RK1 fuses (such as Gould's LP-CC or Bussmann's KTN-R) have tighter, more current-limiting performance. If your system is designed around Class RK1, upgrading to RK1 is acceptable, but downgrading from RK1 to RK5 (like the TR80R) reduces current-limiting protection and may not meet code or equipment manufacturer requirements. Always match the class specified on your disconnect or by your equipment manufacturer.

The Gould TR-R series has transitioned through ownership changes (Gould → Ferraz Shawmut → Mersen). The TR80R may be available as new-old-stock or through the current Mersen equivalent. Common cross-references include the Bussmann FRN-R-80 and Littelfuse FLNR080. Northern Breaker Group specializes in obsolete and hard-to-find fuses — contact us and we'll source the right option for you.

Yes — the TR80R's time-delay characteristic makes it well-suited for motor branch-circuit protection, as it rides through motor inrush currents (typically 6–8× FLA for several seconds) without nuisance opening. Under the Canadian Electrical Code (CEC), dual-element time-delay fuses are an accepted means of motor overload and short-circuit protection when sized correctly per the motor's full-load ampere rating. Always verify sizing against CEC Section 28 requirements and the motor nameplate data for your specific application.