Why Choose the Mersen AJT125 Class J Time-Delay Fuse?
The Mersen AJT125 is a high-performance Class J time-delay fuse designed to provide reliable overcurrent protection for industrial and commercial electrical systems. Part of the proven Mersen Amp-Trap 2000® AJT series, it combines effective current limitation with time-delay characteristics that accommodate temporary motor-starting and transformer inrush currents.
Engineered for demanding branch circuit and feeder applications, the AJT125 helps protect motors, transformers, distribution equipment and industrial machinery against damaging overloads and short circuits. Its compact Class J format supports space-efficient electrical panel designs while providing a high interrupting capacity for dependable operation under severe fault conditions.
With a rated current of 125 A and voltage ratings of up to 600 V AC and 400 V DC, the AJT125 is suitable for motor control centres, switchboards, power distribution systems and OEM machinery. Its blade-style construction enables secure installation in compatible Class J fuse holders and disconnect equipment.
Key Advantages
- Heavy-duty Class J time-delay fuse for industrial circuit protection.
- 125 A current rating for feeders, motors and distribution equipment.
- 600 V AC and 400 V DC voltage ratings.
- Time-delay performance accommodates temporary motor and transformer inrush currents.
- Current-limiting design helps reduce damage to downstream equipment during faults.
- Compact Class J construction supports space-efficient panel layouts.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 125 A current rating.
- 600 V AC / 400 V DC rated voltage.
- Class J time-delay fuse.
- Blade-style terminal configuration.
- Advanced current-limiting construction.
- SmartSpot® visual open-fuse indication.
- Suitable for branch circuits, feeders, motors and transformers.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT series is designed to tolerate the temporary inrush currents produced by motors, transformers and other inductive loads while responding effectively to sustained overloads and high short-circuit currents. This performance helps prevent nuisance fuse operation without compromising equipment protection.
The AJT125 limits the amount of fault energy passed through to downstream components, helping reduce thermal and mechanical stress on conductors, contactors and electrical equipment. This can improve system safety, minimise damage and reduce costly production downtime.
Typical Applications
- Industrial motor control centres.
- Branch circuits and electrical feeders.
- Transformer protection.
- Power distribution panels and switchboards.
- HVAC and refrigeration equipment.
- OEM machinery and industrial automation systems.
