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The A4J25 – GOULD 25A 600V Fast Acting Fuse is designed for reliable protection against overloads and short circuits in electrical systems. With a quick response time, this fuse ensures your equipment remains safe and operational. Ideal for various applications, its durable construction guarantees long-lasting performance for your electrical needs.
A fast-acting (non-time-delay) Class J fuse like the Gould A4J25 responds almost instantly to both overloads and short circuits, making it ideal for protecting equipment that has no significant inrush current — such as resistive loads, capacitors, and semiconductor devices. A time-delay Class J fuse is better suited for motor circuits, where a brief inrush current on startup must be tolerated without nuisance tripping. If you're unsure which type suits your application, our team is happy to help.
Gould's fuse line was acquired by Mersen (formerly Ferraz Shawmut), and some legacy Gould part numbers may be discontinued or rebranded. However, because the A4J25 is a standardized UL Class J fuse, direct replacements are readily available from Mersen, Eaton/Bussmann, and Littelfuse. Northern Breaker Group specializes in obsolete and hard-to-find electrical products — contact us and we'll source the original or confirm the best cross-reference for your needs.
For Canadian installations governed by the Canadian Electrical Code (CEC), fuses must carry CSA certification (or be evaluated by an accredited certification body such as cUL or cCSAus). Gould/Mersen Class J fuses are commonly dual-rated for UL and CSA standards, but we recommend verifying the specific certification marking on the fuse or its packaging before installation. Our team can help confirm compliance for your application — just reach out with your project details.
