Littelfuse 0JTD040.TXID Class J Time Delay Fuse 40A

Product Description

The LITTELFUSE 0JTD040.TXID is a Class J time delay cartridge fuse rated at 40 amps, designed for general-purpose overcurrent protection in commercial and industrial electrical systems. Built with a melamine body, it measures 2-3/8 inches in overall length and 1-1/16 inches in diameter. The time delay characteristic allows brief inrush currents to pass without nuisance tripping, making it well-suited for motor and transformer circuits. It carries an interrupting rating of 20 kA at DC and 200/300 kA at AC, providing robust fault current protection. This fuse is an indicating type, giving a visual signal upon operation to speed up troubleshooting and restore uptime quickly.

This fuse is intended for use in Class J fuse holders and fused disconnects found in commercial HVAC equipment, industrial control panels, motor branch circuits, and transformer protection applications. The Class J form factor provides a high-interrupting-rating solution in a compact footprint. Licensed electricians and controls technicians are the primary installers, typically in branch circuit and feeder applications where time delay characteristics are required to ride through normal startup loads without sacrificing fault protection.

Key Features

• Class J cartridge form factor for use in standard Class J fuse holders and disconnects
• 40-amp time delay rating accommodates motor and transformer inrush currents
• High interrupting rating: 20 kA at DC and 200/300 kA at AC
• Melamine fuse body for durability in demanding panel environments
• Indicating design provides visual confirmation of fuse operation
• Listed to UL 248-8 and CSA File LR29862 for code-compliance in North American installations

Compatibility

Designed as an OEM-style replacement or new-installation fuse for Class J fuse holders and fused disconnect switches rated for 40-amp time delay fuses per UL 248-8.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Verify that the fuse holder is rated for Class J fuses and that the circuit ampacity and voltage rating are compatible before installation. Never substitute a fuse of a different class or higher amperage rating as a replacement.