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The AJT600 – GOULD 600A 600V CLASS J TIME DELAY FUSE is designed for reliable circuit protection in high-demand applications. With a current rating of 600 amps and a voltage rating of 600 volts, this time-delay fuse efficiently prevents overloads, ensuring the safety and longevity of your electrical systems. Perfect for industrial usage.
The AJT600 uses the standard Class J rejection-style blade, so it fits any UL-listed Class J fuse holder or fusible disconnect rated for at least 600A and 600V. Common compatible holders are made by Eaton, Mersen, Littelfuse, and Siemens. Do not install it in a non-Class-J holder — the rejection feature prevents this in most cases, but always verify your holder's Class J rating before installation.
Yes — Northern Breaker Group specialises in obsolete and hard-to-find fuses, and the AJT600 is available through our inventory or sourcing network. The Gould AJT series was carried forward by Mersen (formerly Ferraz Shawmut) as the AJT600, and Littelfuse lists the AJTR600 as a compatible time-delay Class J equivalent. Contact us for current stock and lead times.
Time-delay fuses tolerate the high inrush current that occurs when a motor starts (typically 6–8× full-load amps for several seconds) without nuisance blowing, while still providing fast, reliable protection against sustained overloads and short circuits. The AJT600's 200kA interrupting rating also makes it suitable for high-fault-current industrial environments, meeting NEC/CEC requirements for motor branch-circuit protection.
