Why Choose the Mersen AJT70 Class J Fuse?
The Mersen AJT70 is a high-performance 70 A Class J time-delay fuse designed to protect industrial electrical equipment against overloads and short circuits. Part of the established Mersen Amp-Trap 2000 AJT series, this current-limiting fuse combines dependable fault protection with the ability to withstand temporary inrush currents produced by motors, transformers and other inductive loads.
Its dual-element time-delay construction helps prevent unnecessary fuse operation during normal equipment start-up while responding quickly to dangerous fault currents. The AJT70 is therefore well suited to industrial control panels, motor branch circuits, machinery, transformers and power distribution systems requiring reliable protection and reduced downtime.
With a rated current of 70 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT70 supports demanding industrial installations. Its current-limiting performance helps reduce the thermal and mechanical energy transferred to downstream equipment during a short circuit.
Key Advantages
- Reliable Class J time-delay fuse for industrial circuit protection.
- 70 A current rating for machinery and power distribution applications.
- 600 V AC and 500 V DC ratings for flexible system compatibility.
- Current-limiting operation helps minimise damaging fault energy.
- Time-delay performance accommodates normal motor and transformer inrush currents.
- High interrupting capacity for installations with substantial available fault current.
Key Features
- Mersen Amp-Trap 2000 AJT series.
- 70 A rated current.
- 600 V AC and 500 V DC rated voltage.
- Class J dual-element time-delay construction.
- Current-limiting design for enhanced equipment protection.
- Designed to tolerate temporary motor-starting and transformer inrush currents.
- Blade-style terminals for compatible Class J fuse holders.
- Suitable for branch-circuit, motor, transformer and machinery protection.
Reliable Protection for Industrial Electrical Systems
The Mersen AJT70 protects electrical equipment by interrupting excessive current before conductors and connected components experience serious thermal or mechanical damage. During a short circuit, its current-limiting action restricts the peak current and total fault energy allowed to pass through the circuit.
Unlike fast-acting fuses, the AJT70 incorporates a time delay that tolerates temporary surges associated with motor starting, transformer energisation and similar operating conditions. This balance between inrush tolerance and rapid fault interruption makes it suitable for demanding industrial power and automation systems.
Typical Applications
- Industrial motor branch circuits.
- Transformers and control transformers.
- Machinery and automation control panels.
- Switchboards and power distribution equipment.
- Heating and resistive-load circuits.
- Industrial lighting and general branch circuits.
