Why Choose the Mersen AJT40 Class J Time-Delay Fuse?
The Mersen AJT40 is a high-performance Class J time-delay fuse designed to provide dependable overcurrent protection for industrial electrical systems. As part of the established Mersen Amp-Trap 2000® AJT series, it combines effective current-limiting performance with time-delay operation, making it suitable for motors, transformers and other loads that produce temporary inrush currents during normal start-up.
The AJT40 helps protect conductors, control equipment and machinery against sustained overloads and short-circuit faults while reducing unnecessary fuse operation. Its compact Class J format supports space-efficient electrical panel designs and provides strong fault-current protection for demanding industrial installations.
With a rated current of 40 A and a 600 V AC / 400 V DC rating, the AJT40 is suitable for motor branch circuits, transformer circuits, feeders, industrial control panels and power distribution equipment. Its blade-terminal construction enables secure installation in compatible Class J fuse holders, fuse clips and fused disconnect switches.
Key Advantages
- Industrial Class J time-delay fuse for reliable circuit protection.
- 40 A current rating suitable for machinery and distribution applications.
- 600 V AC and 400 V DC voltage rating.
- Time-delay characteristics accommodate temporary motor and transformer inrush currents.
- Current-limiting performance helps reduce equipment damage during electrical faults.
- Compact Class J construction conserves valuable control-panel space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 40 A rated current.
- 600 V AC / 400 V DC rated voltage.
- Class J time-delay fuse construction.
- Blade-terminal connection.
- 200 kA AC interrupting rating.
- Current-limiting protection for industrial circuits.
- Suitable for compatible Class J fuse holders and disconnect switches.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT40 interrupts dangerous overload and short-circuit currents before excessive fault energy can damage wiring, motors, transformers and electrical control equipment. Its time-delay response allows normal temporary surges associated with motor starting and transformer energisation to pass without unnecessary fuse replacement.
Its current-limiting characteristics help reduce thermal and mechanical stress on downstream components during a fault. This makes the AJT40 a dependable choice for industrial control panels, production machinery and power distribution systems where system reliability and equipment protection are essential.
Typical Applications
- Motor branch circuit protection.
- Industrial control panels.
- Transformer primary and secondary circuits.
- Main and feeder circuits.
- OEM machinery and automation equipment.
- Industrial power distribution systems.
