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MERSEN FUSE 600V 225A CLASS J TD FUSE AJT225
The AJT225 offers superior circuit protection with its time-delay capability, ensuring reliable performance in demanding industrial applications. Its 225A rating and robust 600VAC/500VDC tolerance make it ideal for safeguarding sensitive equipment from damaging surges and short circuits.
£210.87
Why Choose the Mersen AJT225 Class J Time-Delay Fuse?
The Mersen AJT225 is a heavy-duty Class J time-delay fuse designed to provide reliable overcurrent protection for demanding industrial and commercial electrical systems. Part of the established Amp-Trap 2000® AJT series, it combines advanced current-limiting performance with a controlled time delay that accommodates temporary motor-starting and transformer inrush currents.
Engineered for high-current feeder and branch circuit applications, the AJT225 helps protect motors, transformers, switchgear, distribution equipment and industrial machinery against damaging overloads and short circuits. Its compact Class J construction supports space-efficient electrical panel designs while delivering high fault-interruption capability.
With a rated current of 225 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT225 is suitable for motor control centres, switchboards, power distribution panels, fused disconnects and OEM machinery. Its blade-style terminals provide secure installation in compatible Class J fuse holders and switches.
Key Advantages
- Heavy-duty Class J time-delay fuse for industrial circuit protection.
- 225 A current rating for feeders, motors and power distribution equipment.
- 600 V AC and 500 V DC voltage ratings.
- Time-delay operation accommodates temporary motor and transformer inrush currents.
- Current-limiting construction helps reduce fault energy and downstream equipment damage.
- Compact Class J format conserves valuable panel and switchboard space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 225 A current rating.
- 600 V AC / 500 V DC rated voltage.
- Class J time-delay construction.
- Blade-style terminal configuration.
- Advanced current-limiting technology.
- SmartSpot® visual open-fuse indication.
- Suitable for mains, feeders, motors, transformers and branch circuits.
Reliable Protection for Industrial Electrical Systems
The AJT225 is designed to tolerate normal temporary inrush currents generated by motors, transformers and other inductive equipment. Its controlled time-delay response helps prevent unnecessary fuse operation while maintaining effective protection against sustained overload conditions.
During a severe short circuit, the fuse limits the peak current and fault energy passed to downstream conductors and equipment. This helps reduce thermal and mechanical stress on contactors, switchgear, busbars and connected machinery, improving electrical safety and reducing the risk of costly equipment damage.
Typical Applications
- Industrial motor control centres.
- Main and feeder circuit protection.
- Motor branch circuits.
- Transformer primary and secondary protection.
- Power distribution panels and switchboards.
- Fused disconnect switches.
- HVAC and refrigeration equipment.
- OEM machinery and industrial automation systems.
Technical Specifications
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| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 225 A | |
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Time delay | |
| Item number | AJT225 | |
| Description | Fuse AJT - Class J - Time-delay 600VAC 500VDC 225A Blade SmartSpot® Amp-Trap 2000® | |
| EAN/UPC Code | 782001962289 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 225 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 | 54 mm | |
| Product Length | 181.1 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.8528 kg | |
| Sell Pack Width | 53.8 mm | |
| Sell Pack Length | 53.8 mm | |
| Sell Pack Height | 184.1 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.8119 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen AJT225 used for?
The AJT225 protects industrial mains, feeders, motors, transformers, branch circuits and power distribution equipment against overloads and short circuits.
What is the current rating of the AJT225?
The Mersen AJT225 has a rated current of 225 A.
What voltage is the AJT225 rated for?
The fuse is rated for applications up to 600 V AC and 500 V DC.
Why does the AJT225 have a time delay?
The time-delay characteristic allows temporary motor-starting and transformer inrush currents to pass without unnecessary fuse operation while maintaining protection against sustained overloads.
Does the AJT225 include a blown-fuse indicator?
Yes. The AJT225 incorporates a SmartSpot® visual open-fuse indicator to help maintenance personnel identify an operated fuse quickly.
Trusted by Electrical Professionals Worldwide
Mersen Amp-Trap 2000® Class J fuses are widely selected by electrical engineers, panel builders and maintenance professionals for compact installation, dependable time-delay operation and exceptional current-limiting performance.
