Why Choose the Mersen AJT225 Class J Time-Delay Fuse?
The Mersen AJT225 is a heavy-duty Class J time-delay fuse designed to provide reliable overcurrent protection for demanding industrial and commercial electrical systems. Part of the established Amp-Trap 2000® AJT series, it combines advanced current-limiting performance with a controlled time delay that accommodates temporary motor-starting and transformer inrush currents.
Engineered for high-current feeder and branch circuit applications, the AJT225 helps protect motors, transformers, switchgear, distribution equipment and industrial machinery against damaging overloads and short circuits. Its compact Class J construction supports space-efficient electrical panel designs while delivering high fault-interruption capability.
With a rated current of 225 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT225 is suitable for motor control centres, switchboards, power distribution panels, fused disconnects and OEM machinery. Its blade-style terminals provide secure installation in compatible Class J fuse holders and switches.
Key Advantages
- Heavy-duty Class J time-delay fuse for industrial circuit protection.
- 225 A current rating for feeders, motors and power distribution equipment.
- 600 V AC and 500 V DC voltage ratings.
- Time-delay operation accommodates temporary motor and transformer inrush currents.
- Current-limiting construction helps reduce fault energy and downstream equipment damage.
- Compact Class J format conserves valuable panel and switchboard space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 225 A current rating.
- 600 V AC / 500 V DC rated voltage.
- Class J time-delay construction.
- Blade-style terminal configuration.
- Advanced current-limiting technology.
- SmartSpot® visual open-fuse indication.
- Suitable for mains, feeders, motors, transformers and branch circuits.
Reliable Protection for Industrial Electrical Systems
The AJT225 is designed to tolerate normal temporary inrush currents generated by motors, transformers and other inductive equipment. Its controlled time-delay response helps prevent unnecessary fuse operation while maintaining effective protection against sustained overload conditions.
During a severe short circuit, the fuse limits the peak current and fault energy passed to downstream conductors and equipment. This helps reduce thermal and mechanical stress on contactors, switchgear, busbars and connected machinery, improving electrical safety and reducing the risk of costly equipment damage.
Typical Applications
- Industrial motor control centres.
- Main and feeder circuit protection.
- Motor branch circuits.
- Transformer primary and secondary protection.
- Power distribution panels and switchboards.
- Fused disconnect switches.
- HVAC and refrigeration equipment.
- OEM machinery and industrial automation systems.
