Why Choose the Mersen AJT90 Class J Fuse?
The Mersen AJT90 is a high-performance 90 A Class J time-delay fuse designed to protect industrial electrical systems against damaging overloads and short circuits. Part of the established Mersen Amp-Trap 2000 AJT series, it combines excellent current-limiting performance with the ability to withstand temporary inrush currents generated by motors, transformers and other inductive loads.
Its time-delay operating characteristic helps prevent unnecessary fuse operation during normal equipment start-up while providing rapid interruption when a genuine fault occurs. The AJT90 is suitable for main, feeder and branch circuits serving industrial machinery, motors, transformers, control panels and power distribution equipment.
With a rated current of 90 A and voltage ratings of up to 600 V AC and 400 V DC, the Mersen AJT90 is engineered for demanding commercial and industrial installations. Its compact Class J format requires significantly less mounting space than comparable 600 V Class RK fuses, helping panel builders create smaller and more efficient electrical assemblies.
Key Advantages
- Reliable Class J time-delay fuse for industrial circuit protection.
- 90 A current rating for machinery and power distribution applications.
- 600 V AC and 400 V DC voltage ratings.
- Current-limiting operation helps reduce damaging peak fault current and energy.
- Time-delay performance accommodates normal motor and transformer inrush currents.
- Compact design requires approximately half the mounting space of comparable 600 V Class RK fuses.
Key Features
- Mersen Amp-Trap 2000 AJT series.
- 90 A rated current.
- 600 V AC and 400 V DC rated voltage.
- Class J time-delay current-limiting construction.
- SmartSpot visual open-fuse indicator.
- High 200 kA AC interrupting capacity.
- Tin-plated copper blade terminals.
- Suitable for clip-mounted or bolted installation.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT90 interrupts excessive current before conductors and connected equipment sustain serious thermal or mechanical damage. Its advanced current-limiting performance restricts the peak current and total energy permitted to pass through the circuit during a short circuit, helping protect valuable downstream components.
The fuse's time-delay characteristic allows it to tolerate harmless temporary surges caused by motor starting, transformer energisation and similar operating events. This balance of inrush tolerance and rapid fault interruption makes the AJT90 a dependable choice for industrial power distribution and automation systems.
Typical Applications
- Industrial motor branch circuits.
- Main, feeder and branch-circuit protection.
- Transformers and control transformers.
- Machinery and automation control panels.
- Switchboards and power distribution equipment.
- Heating, lighting and general industrial loads.
