Why Choose the Mersen AJT12 Class J Time-Delay Fuse?
The Mersen AJT12 is a high-performance Class J time-delay fuse designed to provide dependable overcurrent protection for industrial and commercial electrical systems. As part of the established Amp-Trap 2000® AJT series, it combines current-limiting protection with time-delay characteristics that allow temporary motor-starting and transformer inrush currents without unnecessary fuse operation.
Engineered for branch circuit protection, the AJT12 helps protect motors, transformers, control equipment and distribution circuits against damaging overloads and short circuits. Its compact Class J format supports space-efficient panel designs, while its high interrupting capacity provides reliable performance in demanding fault conditions.
With a rated current of 12 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT12 is suitable for industrial control panels, motor circuits, HVAC equipment, transformers and OEM machinery. Its ferrule-style construction allows straightforward installation in compatible Class J fuse holders.
Key Advantages
- Compact Class J time-delay fuse for branch circuit protection.
- 12 A current rating for industrial control and power applications.
- 600 V AC and 500 V DC voltage ratings.
- Time-delay performance accommodates temporary motor and transformer inrush currents.
- Current-limiting design helps reduce damage to downstream electrical equipment.
- Compact dimensions support efficient use of control panel space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 12 A current rating.
- 600 V AC / 500 V DC rated voltage.
- Class J time-delay fuse.
- Ferrule-style mounting configuration.
- Current-limiting construction.
- Visual open-fuse indication for easier maintenance.
- Suitable for motors, transformers, feeders and branch circuits.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT series is designed to respond quickly to severe short circuits while tolerating the temporary inrush currents commonly produced by motors, transformers and other inductive loads. This combination helps prevent nuisance fuse operation while maintaining effective protection against sustained overloads and high fault currents.
Its current-limiting performance helps reduce the thermal and mechanical energy passed to downstream components during a fault. This can minimise equipment damage, improve electrical safety and reduce costly production downtime in industrial installations.
Typical Applications
- Industrial control panels.
- Motor branch circuits and motor control centres.
- Transformer primary and secondary protection.
- HVAC and refrigeration equipment.
- OEM machinery and automation systems.
- Power distribution panels and electrical feeders.
