Why Choose the Mersen AJT50 Class J Time-Delay Fuse?
The Mersen AJT50 is a high-performance Class J time-delay fuse designed to provide reliable overcurrent protection for industrial electrical systems. As part of the proven Mersen Amp-Trap 2000® AJT series, it combines time-delay operation with superior current-limiting capability, making it suitable for motors, transformers, feeders and branch circuits that experience temporary inrush currents during normal operation.
The AJT50 is engineered to tolerate typical motor-starting and transformer-energisation currents while responding effectively to sustained overloads and short circuits. Its compact Class J construction requires approximately half the mounting space of comparable 600 V AC Class RK fuses, helping panel builders and equipment manufacturers create space-efficient electrical assemblies without compromising protection.
With a rated current of 50 A and a voltage rating of 600 V AC / 400 V DC, the AJT50 is suitable for industrial machinery, motor branch circuits, transformer protection and power distribution equipment. Its ferrule terminals provide a secure connection in compatible Class J fuse clips, holders and fused disconnect switches.
Key Advantages
- Industrial Class J time-delay fuse for dependable overcurrent protection.
- 50 A current rating for motor, transformer and distribution circuits.
- 600 V AC / 400 V DC voltage rating.
- Time-delay characteristics accommodate normal motor and transformer inrush currents.
- Current-limiting performance helps reduce thermal and mechanical damage during faults.
- Compact Class J footprint helps conserve valuable panel space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 50 A rated current.
- 600 V AC / 400 V DC rated voltage.
- Class J time-delay fuse construction.
- Ferrule terminal configuration.
- 200 kA AC interrupting rating.
- Tin-plated copper terminal material.
- Supports IEC Type 2 No Damage protection.
- Available with non-indicating or SmartSpot® visual indication options within the AJT range.
- RoHS-compliant construction.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT50 helps protect conductors, motors, transformers and electrical equipment by interrupting dangerous overload and short-circuit currents before excessive fault energy can cause serious damage. Its time-delay response allows temporary start-up currents to pass without unnecessary fuse operation, helping improve equipment availability and reduce maintenance.
During high-level faults, the fuse's current-limiting characteristics reduce the peak current and let-through energy experienced by downstream components. This can help minimise thermal stress, mechanical forces and equipment damage in demanding industrial environments.
Typical Applications
- Motor branch circuit protection.
- Transformer primary and secondary circuits.
- Main and feeder circuit protection.
- Industrial control panels.
- OEM machinery and automation equipment.
- Fused disconnect switches.
- Industrial power distribution systems.
