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 J TD FUSE 600V 200A AJT AJT200
The AJT200 fuse delivers reliable circuit protection with a 200A time-delay response, supporting both 600VAC and 500VDC systems. Featuring SmartSpot® visual indicator technology and Amp-Trap 2000® construction for enhanced safety and rapid fault identification.
£99.89
Why Choose the Mersen AJT200 Class J Time-Delay Fuse?
The Mersen AJT200 is a heavy-duty Class J time-delay fuse designed to provide dependable overcurrent protection for 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 demanding feeder and branch circuit applications, the AJT200 helps protect motors, transformers, switchgear, distribution equipment and industrial machinery against damaging overloads and short circuits. Its compact Class J construction supports space-efficient panel layouts while providing exceptional fault interruption capability.
With a rated current of 200 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT200 is suitable for motor control centres, power distribution panels, fused disconnects and OEM equipment. 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.
- 200 A current rating for feeders, motors and distribution equipment.
- 600 V AC and 500 V DC voltage ratings.
- Time-delay characteristics accommodate temporary motor and transformer inrush currents.
- Current-limiting construction helps reduce fault energy and downstream equipment damage.
- Compact Class J format conserves valuable switchboard and panel space.
Key Features
- Mersen Amp-Trap 2000® AJT series.
- 200 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 Mersen AJT200 is designed to tolerate normal temporary inrush currents produced by motors, transformers and other inductive equipment while responding effectively to sustained overloads. This helps reduce nuisance fuse operation and supports consistent system availability in demanding industrial environments.
During a severe short circuit, the fuse limits the peak current and fault energy passed to downstream conductors and equipment. This reduces thermal and mechanical stress on contactors, switchgear, busbars and connected machinery, helping improve electrical safety and minimise costly 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
Tick the specs you need, then view products that match.
| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 200 A | |
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Time delay | |
| Item number | AJT200 | |
| Description | Fuse AJT - Class J - Time-delay 600VAC 500VDC 200A Blade SmartSpot® Amp-Trap 2000® | |
| EAN/UPC Code | 782001962494 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 200 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 | 41.3 mm | |
| Product Length | 146 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.3629 kg | |
| Sell Pack Width | 42.9 mm | |
| Sell Pack Length | 42.9 mm | |
| Sell Pack Height | 152.4 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.3465 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen AJT200 used for?
The AJT200 protects industrial mains, feeders, motors, transformers, branch circuits and power distribution equipment against overloads and short circuits.
What is the current rating of the AJT200?
The Mersen AJT200 has a rated current of 200 A.
What voltage is the AJT200 rated for?
The fuse is rated for applications up to 600 V AC and 500 V DC.
Why does the AJT200 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 AJT200 include a blown-fuse indicator?
Yes. The AJT200 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, reliable time-delay operation and exceptional current-limiting performance.
