Cooper Bussmann JJS-40 Class T Cartridge Fuse 40A 600V

Product Description

The COOPER BUSSMANN JJS-40 is a Class T fast-acting cartridge fuse rated at 40 amps and 600 volts AC. It provides overcurrent protection in electrical distribution systems where a compact, high-interrupting-capacity fuse is required. With an interrupting rating of 200 kA at AC (RMS), this fuse is built for demanding commercial and industrial panel applications. The cartridge body measures 20.6 mm in diameter and 1-9/16 inches in overall length. Licensed electricians and industrial maintenance technicians install this fuse in fuse holders designed for Class T form factors. CE, CSA, and UL listings confirm compliance with major North American and international standards.

The JJS-40 is suited for use in commercial and industrial electrical systems where high fault-current capacity and a compact footprint are required. Class T fuses are commonly installed in motor branch circuits, feeder panels, and equipment disconnect applications. The fast-acting design provides rapid response to overloads and short-circuit conditions. This fuse mounts in a compatible Class T fuse holder. Its small diameter and standardized length make it a common choice in space-constrained enclosures and switchgear assemblies.

Key Features

• 40 amp continuous current rating with 600 volt AC rating
• 200 kA interrupting rating at AC (RMS) for high fault-current environments
• Fast-acting fuse timing for rapid overcurrent response
• Class T form factor: 20.6 mm diameter, 1-9/16 inches overall length
• Mounts in standard Class T fuse holders
• CE Certified, CSA C22.2 No. 248.15 Certified, and UL Listed 248-15 Class T

Compatibility

Designed for use in fuse holders rated for Class T cartridge fuses. Consult the fuse holder manufacturer specifications to confirm voltage, amperage, and physical dimension compatibility before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before replacing any fuse. Confirm the replacement fuse matches the amperage, voltage, and Class T form factor of the original. Never install a fuse with a higher amperage rating than the circuit is designed to carry.