Why Choose the Mersen AJT450 Class J Time-Delay Fuse?
The Mersen AJT450 is a high-capacity Class J time-delay fuse designed to provide dependable overcurrent protection in demanding industrial electrical systems. Part of the established Mersen Amp-Trap 2000® AJT series, it combines time-delay operation with advanced current-limiting performance, making it suitable for main circuits, feeders, motor branch circuits, transformers and heavy industrial machinery.
The AJT450 is engineered to withstand normal temporary inrush currents produced during motor starting and transformer energisation while responding effectively to sustained overloads and short circuits. This helps reduce unnecessary fuse operation while limiting the fault energy passed to downstream conductors and equipment.
With a rated current of 450 A and a voltage rating of 600 V AC / 400 V DC, the AJT450 is suitable for high-current industrial power distribution and equipment protection. Its compact Class J construction and blade terminals support secure installation in compatible fuse clips, fuse holders and fused disconnect switches.
Key Advantages
- High-capacity Class J time-delay fuse for industrial circuit protection.
- 450 A current rating for demanding power distribution applications.
- 600 V AC / 400 V DC voltage rating.
- Time-delay performance accommodates normal motor and transformer inrush currents.
- Current-limiting operation helps reduce thermal and mechanical fault damage.
- Compact Class J footprint supports space-efficient panel designs.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 450 A rated current.
- 600 V AC / 400 V DC rated voltage.
- Class J time-delay fuse construction.
- Blade-terminal configuration.
- 200 kA AC interrupting rating.
- Advanced current-limiting protection.
- Suitable for motor, transformer, feeder and branch circuit applications.
- Designed for compatible Class J fuse holders and fused disconnects.
Reliable Protection for High-Current Industrial Systems
The Mersen AJT450 helps protect motors, transformers, switchgear, conductors and distribution equipment by interrupting dangerous overcurrents before excessive fault energy can cause serious damage. Its time-delay response permits normal temporary start-up currents without compromising protection against sustained electrical faults.
During a high-level short circuit, the fuse's current-limiting characteristics help reduce the peak current and let-through energy experienced by downstream components. This can minimise equipment damage, lower electrical stress and support improved system reliability in demanding industrial environments.
Typical Applications
- Main and feeder circuit protection.
- High-current motor branch circuits.
- Industrial transformer protection.
- Motor control centres.
- Switchboards and distribution panels.
- OEM machinery and automation systems.
- Industrial fused disconnect switches.
