Mersen AJT5 Class J Time-delay Fuse 5A 600VAC

Product Description

The MERSEN AJT5 is a Class J time-delay fuse rated at 5 amps, 600 volts AC, and 400 volts DC, designed for ferrule-style fuse holders. Part of the Amp-Trap 2000 series, it combines a non-indication design with a SmartSpot visual open-fuse indicator, making fault identification faster during service calls. Advanced material technology gives the AJT5 IEC Type 2 No Damage protection, safeguarding main, feeder, and branch circuit components from damage during fault events. Licensed electricians and industrial maintenance technicians are the primary installers of this fuse type.

The AJT5 is suited for protecting all types of loads, including motor and transformer circuits where inrush current must be tolerated without nuisance opening. Its time-delay characteristic handles typical motor starting and transformer energizing inrush currents while maintaining superior current-limiting performance during fault conditions. The ferrule form factor requires only half the mounting space of comparable 600VAC Class RK fuses, making it a practical choice for space-constrained panelboards, motor control centers, and combination starters in both commercial and industrial installations.

Key Features

• Class J time-delay design tolerates motor and transformer inrush currents without nuisance opens
• SmartSpot visual open-fuse indicator allows quick identification of blown fuses without a meter
• IEC Type 2 No Damage protection for main, feeder, and branch circuit components
• Ferrule form factor occupies half the mounting space of 600VAC Class RK fuses
• Dual voltage rating: 600 volts AC and 400 volts DC
• Superior current-limiting ability reduces arc flash energy and downstream damage

Compatibility

Designed as an OEM-style replacement for Class J ferrule-style fuse holders rated for 600VAC service in motor, feeder, and branch circuit protection applications.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize and lock out the circuit before removing or installing any fuse. Verify the fuse holder is rated for Class J ferrule fuses and confirm the circuit voltage and current ratings match the fuse specifications before energizing. Do not substitute a non-time-delay fuse in motor circuit applications where inrush tolerance is required.