A4J500 – GOULD 500A 600V FAST ACTING FUSE

Fast-acting Class J fuses like the Gould A4J500 respond almost instantaneously to both overloads and short circuits, making them ideal for protecting equipment without motors — such as resistive heating elements, capacitors, and semiconductor-based equipment. If your load has a motor or transformer that draws a high inrush current on start-up, a time-delay Class J fuse is typically recommended to avoid nuisance blowing. Not sure which type suits your application? Contact our team and we can help you choose.

The Gould A4J series has transitioned through several brand ownership changes (Gould → Ferraz Shawmut → Mersen). Some variants may be discontinued or hard to source through standard distribution channels. Northern Breaker Group specializes in obsolete and hard-to-find electrical components — we maintain extensive inventory and supplier networks across Canada. Contact us for availability and we'll do our best to source the exact A4J500 or a fully compatible equivalent.

Yes — Class J fuses are recognized under both UL 248-8 and the Canadian Electrical Code (CEC). The A4J500's 200kA interrupting rating meets or exceeds the available fault current requirements in virtually all industrial distribution applications, helping you achieve CEC-compliant overcurrent protection. Always verify the available fault current at your installation point and consult a licensed electrician to ensure full CEC compliance for your specific system.