Why Choose the Mersen AJT300 Class J Time-Delay Fuse?
The Mersen AJT300 is a high-performance Class J time-delay fuse designed to provide reliable overcurrent protection for demanding industrial electrical systems. As part of the advanced Mersen Amp-Trap 2000® AJT series, it combines time-delay operation with superior current-limiting performance, making it suitable for main circuits, feeders and branch circuits serving a wide range of electrical loads.
This fuse is engineered to withstand temporary motor-starting and transformer inrush currents while responding effectively to sustained overloads and short circuits. Its advanced material technology supports IEC Type 2 No Damage protection, helping reduce the risk of costly damage to contactors, motor starters and other connected equipment during fault conditions.
With a rated current of 300 A and a 600 V AC / 400 V DC rating, the AJT300 is ideal for high-current industrial distribution, motor protection and machinery applications. Its compact Class J format requires approximately half the mounting space of comparable 600 V AC Class RK fuses, while its blade terminals support secure installation in compatible fuse clips, holders and fused disconnect switches.
Key Advantages
- High-capacity Class J time-delay fuse for industrial circuit protection.
- 300 A current rating suitable for demanding power distribution applications.
- 600 V AC and 400 V DC voltage rating.
- Time-delay characteristics accommodate motor and transformer inrush currents.
- Superior current-limiting performance helps minimise equipment damage.
- Compact design requires less mounting space than comparable Class RK fuses.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 300 A ampere rating.
- 600 V AC / 400 V DC rated voltage.
- Class J time-delay fuse construction.
- Blade terminal connection.
- 200 kA AC interrupting rating.
- Supports IEC Type 2 No Damage protection.
- Suitable for clip or bolted mounting.
Reliable Protection for High-Current Industrial Systems
The Mersen AJT300 protects electrical equipment by interrupting dangerous overload and short-circuit currents before they can cause extensive thermal or mechanical damage. Its time-delay performance allows normal temporary surges from motors, transformers and other inductive loads to pass without unnecessary fuse operation.
The fuse’s high interrupting capacity and current-limiting characteristics make it suitable for industrial systems with substantial available fault current. Its compact Class J construction also helps panel builders and equipment manufacturers create smaller, more efficient electrical assemblies without compromising protection.
Typical Applications
- Main and feeder circuit protection.
- High-current motor branch circuits.
- Industrial transformer protection.
- Switchboards and distribution panels.
- OEM machinery and automation systems.
- Fused disconnect switches and industrial control equipment.
