Why Choose the Mersen AJT4N Class J Time-Delay Fuse?
The Mersen AJT4N is a premium Class J time-delay fuse designed to deliver dependable overcurrent protection for industrial electrical systems. As part of the trusted Mersen Amp-Trap 2000® AJT series, it combines advanced current-limiting performance with time-delay characteristics, making it ideal for protecting motors, transformers, feeders and branch circuits where temporary inrush currents occur during normal operation.
Engineered using advanced fuse technology, the AJT4N tolerates temporary motor-starting and transformer-energisation currents while rapidly clearing sustained overloads and short circuits. Its compact Class J design requires approximately half the mounting space of comparable Class RK fuses, helping reduce enclosure size while maintaining outstanding circuit protection.
With a 4 A current rating and a 600 V AC / 500 V DC rating, the AJT4N is ideally suited to industrial control panels, OEM machinery, motor branch circuits and transformer protection. Its ferrule construction allows secure installation into compatible Class J fuse holders and disconnect switches.
Key Advantages
- Compact Class J time-delay fuse for industrial circuit protection.
- 4 A current rating for precision electrical protection.
- 600 V AC / 500 V DC voltage rating.
- Time-delay characteristics minimise nuisance operation caused by motor and transformer inrush currents.
- Excellent current-limiting performance helps protect valuable electrical equipment.
- Compact footprint reduces panel space requirements.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 4 A ampere rating.
- 600 V AC / 500 V DC rated voltage.
- Class J time-delay fuse construction.
- Ferrule terminal design.
- 200 kA AC interrupting rating.
- Non-indicating fuse configuration.
- Supports IEC Type 2 No Damage protection.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT4N delivers reliable protection against overloads and short circuits while allowing temporary inrush currents generated by motors and transformers to pass without unnecessary fuse operation. Its advanced current-limiting technology helps reduce thermal and mechanical stress on connected equipment, improving reliability and minimising maintenance costs.
Its compact Class J construction makes it an excellent choice for industrial control panels, automation systems, OEM machinery and electrical distribution equipment where dependable overcurrent protection and efficient use of installation space are essential.
Typical Applications
- Industrial control panels.
- Motor branch circuit protection.
- Transformer protection.
- OEM machinery and automation systems.
- Main, feeder and branch circuits.
- Industrial power distribution equipment.
