MERSEN FUSE 600V 100A CLASS J TD FUSE AJT100

Why Choose the Mersen AJT100 Amp-Trap 2000® Fuse?

The Mersen AJT100 is a high-performance Class J time-delay current-limiting fuse developed to protect industrial and commercial electrical systems against overloads and short circuits. Part of the trusted Mersen Amp-Trap 2000® AJT series, it combines strong current-limiting performance with the ability to withstand normal motor-starting currents and transformer inrush without unnecessary fuse operation.

Rated at 100 A, the AJT100 is suitable for mains, feeders, branch circuits, motor circuits, transformers and general industrial loads. Its time-delay characteristic improves system continuity during temporary inrush conditions, while its rapid response to genuine faults helps limit peak current and damaging let-through energy.

The Mersen AJT100 is rated for operation at up to 600 V AC and 400 V DC. Its compact Class J dimensions require less panel space than many comparable Class RK fuse arrangements, while the rejection-style construction helps prevent replacement with an unsuitable fuse class.

Key Advantages

• Class J time-delay fuse for industrial circuit protection.
• 100 A current rating for feeders, motors and distribution equipment.
• 600 V AC and 400 V DC voltage ratings.
• Handles normal motor-starting and transformer-inrush currents.
• Current-limiting performance reduces peak fault current and let-through energy.
• 200 kA AC and 100 kA DC interrupting ratings.
• Compact footprint helps reduce fuse-block and panel-space requirements.
• SmartSpot® visual indicator helps identify an open fuse.

Key Features

• Mersen Amp-Trap 2000® AJT series.
• 100 A rated current.
• 600 V AC rating.
• 400 V DC rating.
• Time-delay current-limiting operation.
• SmartSpot® visual open-fuse indication.
• Blade-terminal construction.
• Fibreglass body for dimensional stability in harsh environments.
• High-grade silica filler supports rapid arc quenching.
• Compatible with correctly rated Class J fuse holders.

Dependable Time-Delay Protection for Industrial Equipment

The Mersen AJT100 is engineered for circuits that experience temporary inrush currents during normal operation. Its time-delay characteristic allows motors, transformers and other inductive equipment to start without nuisance fuse opening, while maintaining effective overload and short-circuit protection.

During a high-current fault, the AJT100 operates as a current-limiting device, interrupting the circuit before the prospective fault current reaches its maximum value. This reduces thermal and mechanical stress on conductors, switches, contactors, busbars and connected equipment.

When correctly selected and coordinated, Amp-Trap 2000® AJT fuses can support IEC Type 2 no-damage protection for motor-starter assemblies. The AJT100 also offers easy 2-to-1 selectivity, helping isolate the affected circuit and reduce unnecessary shutdowns elsewhere in the electrical system.

Typical Applications

• Motor circuits and motor-control centres.
• Main incoming circuit protection.
• Industrial feeder circuits.
• Branch-circuit protection.
• Transformer primary and secondary protection.
• Industrial control panels.
• Panelboards and switchboards.
• Bus duct systems.
• Load centres.
• Lighting, heating and general industrial loads.
• Circuit-breaker back-up protection.