Why Choose the Mersen AJT200 Class J Time-Delay Fuse?
The Mersen AJT200 is a heavy-duty Class J time-delay fuse designed to provide dependable overcurrent protection for 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 demanding feeder and branch circuit applications, the AJT200 helps protect motors, transformers, switchgear, distribution equipment and industrial machinery against damaging overloads and short circuits. Its compact Class J construction supports space-efficient panel layouts while providing exceptional fault interruption capability.
With a rated current of 200 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT200 is suitable for motor control centres, power distribution panels, fused disconnects and OEM equipment. 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.
- 200 A current rating for feeders, motors and distribution equipment.
- 600 V AC and 500 V DC voltage ratings.
- Time-delay characteristics accommodate temporary motor and transformer inrush currents.
- Current-limiting construction helps reduce fault energy and downstream equipment damage.
- Compact Class J format conserves valuable switchboard and panel space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 200 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 Mersen AJT200 is designed to tolerate normal temporary inrush currents produced by motors, transformers and other inductive equipment while responding effectively to sustained overloads. This helps reduce nuisance fuse operation and supports consistent system availability in demanding industrial environments.
During a severe short circuit, the fuse limits the peak current and fault energy passed to downstream conductors and equipment. This reduces thermal and mechanical stress on contactors, switchgear, busbars and connected machinery, helping improve electrical safety and minimise costly 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.
