​AJT125 – GOULD 125A 600V CLASS JTIME DELAY FUSE

The AJT125 features a time-delay element that tolerates temporary motor inrush and transformer magnetising currents without nuisance blowing. A fast-acting Class J fuse (such as the AJT's non-time-delay counterpart) would operate on any overcurrent above its rating, making it unsuitable for motor-branch or transformer circuits where brief current spikes are normal at startup.

Yes. Class J time-delay fuses like the AJT125 are widely used for motor branch-circuit protection in compliance with the Canadian Electrical Code (CEC). The time-delay characteristic accommodates motor locked-rotor inrush current, while the 200kA interrupting rating satisfies high-fault-current industrial environments. Always verify your specific motor FLA and CEC sizing rules (typically 175–225% of FLA for time-delay fuses) when selecting the correct ampere rating.

The Gould AJT series was absorbed into the Mersen (formerly Ferraz Shawmut) product line following corporate changes, and the AJT125 equivalent is available under the Mersen/Ferraz Shawmut AJT125 catalogue number. The Littelfuse JLLS125 is another recognised Class J time-delay replacement. Northern Breaker Group specialises in obsolete and hard-to-find fuses — contact us or visit one of our Calgary, Edmonton, or Vancouver counters and we'll help source the right replacement.