Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE 600V 450A CLASS J TD FUSE AJT450
The AJT450 Amp-Trap 2000® SmartSpot® fuse offers superior circuit protection for demanding industrial applications, with a 450A rating and robust dual voltage capability (600VAC/500VDC). Its time-delay characteristic ensures reliable operation under temporary overloads, reducing unnecessary downtime and nuisance tripping.
£318.12
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.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 450 A | |
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Time delay | |
| Item number | AJT450 | |
| Description | Fuse AJT - Class J - Time-delay 600VAC 500VDC 450A Blade SmartSpot® Amp-Trap 2000® | |
| EAN/UPC Code | 782001962180 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 450 A | |
| AC or DC | AC/DC | |
| Fuse Class | Class J | |
| Speed/Characteristic | Time Delay | |
| Mounting | Clip or Bolted | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Indication System | Yes | |
| Indication System Type | SmartSpot® | |
| Connection/Terminal Material | Brass | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 63.5 mm | |
| Product Length | 203.2 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.4379 kg | |
| Sell Pack Width | 63.5 mm | |
| Sell Pack Length | 222.2 mm | |
| Sell Pack Height | 60.5 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 1.3698 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen AJT450 used for?
The AJT450 is used to protect high-current industrial main, feeder, motor, transformer and branch circuits against sustained overloads and short-circuit faults.
What is the current rating of the AJT450?
The Mersen AJT450 has a rated current of 450 A.
What voltage is the AJT450 rated for?
The AJT450 is rated for operation at up to 600 V AC and 400 V DC.
Can the AJT450 handle motor starting currents?
Yes. Its time-delay characteristics allow normal temporary motor-starting and transformer-energisation currents while maintaining dependable protection against sustained overloads and short circuits.
What is the interrupting rating of the AJT450?
The AJT450 has an AC interrupting rating of 200 kA, making it suitable for installations with high available fault currents.
Where is the Mersen AJT450 typically installed?
It is commonly installed in industrial switchboards, motor control centres, machinery and power distribution equipment using compatible Class J fuse holders or fused disconnect switches.
Trusted for Industrial Circuit Protection
Mersen Amp-Trap 2000® AJT Class J fuses are widely selected by electrical engineers, panel builders and equipment manufacturers for dependable time-delay operation, high interrupting capacity and effective current limitation.
