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MERSEN FUSE 600V 500A CLASS J TD FUSE AJT500
The AJT500 provides superior circuit protection with its Class J time-delay technology, rated for 600VAC and 500VDC at 500A, featuring SmartSpot® visual indication and Amp-Trap 2000® construction.
£318.12
Why Choose the Mersen AJT500 Class J Time-Delay Fuse?
The Mersen AJT500 is a high-capacity Class J time-delay fuse engineered to provide dependable overcurrent protection for demanding industrial electrical systems. As part of the established Mersen Amp-Trap 2000® AJT series, it combines time-delay operation with advanced current-limiting performance, making it suitable for mains, feeders, motor branch circuits, transformers and heavy industrial machinery.
The AJT500 is designed to tolerate normal temporary inrush currents produced during motor starting and transformer energisation while responding effectively to sustained overloads and short circuits. This dual-element performance helps prevent unnecessary fuse operation while limiting the fault current and energy passed to downstream equipment.
With a rated current of 500 A and a voltage rating of 600 V AC / 400 V DC, the AJT500 is suitable for high-current industrial power distribution and machinery protection. Its compact Class J construction and blade terminals enable 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.
- 500 A current rating for demanding power distribution applications.
- 600 V AC / 400 V DC voltage rating.
- Time-delay operation accommodates normal motor and transformer inrush currents.
- Current-limiting performance helps reduce thermal and mechanical fault damage.
- Compact Class J footprint supports space-efficient switchboard and panel designs.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 500 A rated current.
- 600 V AC / 400 V DC rated voltage.
- Class J dual-element time-delay construction.
- Blade-terminal configuration.
- 200 kA AC interrupting rating.
- Advanced current-limiting protection.
- Designed to accommodate temporary equipment start-up currents.
- Suitable for compatible Class J fuse holders and fused disconnect switches.
Reliable Protection for High-Current Industrial Systems
The Mersen AJT500 helps protect motors, transformers, conductors, switchgear and distribution equipment by interrupting dangerous overcurrents before excessive fault energy can cause serious damage. Its time-delay response permits normal temporary starting currents without compromising protection against sustained overloads and short-circuit conditions.
During a high-level fault, the fuse's current-limiting characteristics restrict the peak current and let-through energy experienced by downstream components. This helps reduce electrical, thermal and mechanical stress while supporting improved equipment reliability and system availability.
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.
- Commercial and industrial power distribution systems.
Technical Specifications
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| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 500 A | |
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Time delay | |
| Item number | AJT500 | |
| Description | Fuse AJT - Class J - Time-delay 600VAC 500VDC 500A Blade SmartSpot® Amp-Trap 2000® | |
| EAN/UPC Code | 782001962173 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 500 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 AJT500 used for?
The AJT500 protects high-current industrial mains, feeders, motors, transformers and branch circuits against sustained overloads and short-circuit faults.
What is the current rating of the AJT500?
The Mersen AJT500 has a rated current of 500 A.
What voltage is the AJT500 rated for?
The AJT500 is rated for operation at up to 600 V AC and 400 V DC.
Can the AJT500 handle motor starting currents?
Yes. Its dual-element 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 AJT500?
The AJT500 has an AC interrupting rating of 200 kA, making it suitable for installations with high available fault currents.
What type of terminals does the AJT500 use?
The AJT500 uses blade terminals for installation in compatible Class J fuse clips, holders and fused disconnect switches.
Where is the Mersen AJT500 typically installed?
It is commonly installed in industrial switchboards, motor control centres, distribution panels, machinery and fused disconnect equipment.
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.
