Why Choose the Mersen AJT2-1/4N Class J Time-Delay Fuse?
The Mersen AJT2-1/4N is a compact 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 effective current limitation with time-delay characteristics that accommodate temporary motor-starting and transformer inrush currents.
Engineered for low-current branch circuit applications, the AJT2-1/4N helps protect motors, transformers, control circuits and industrial equipment against sustained overloads and short circuits. Its compact Class J construction supports space-efficient panel designs while delivering high fault-interruption performance in demanding electrical installations.
With a rated current of 2.25 A and voltage ratings of up to 600 V AC and 500 V DC, the AJT2-1/4N is suitable for industrial control panels, automation equipment, HVAC systems and OEM machinery. The N suffix identifies this product as a non-indicating fuse without a visual open-fuse indicator.
Key Advantages
Compact Class J time-delay fuse for industrial branch circuits.
2.25 A current rating for low-current equipment and control applications.
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 equipment damage.
Space-saving dimensions support compact control panel layouts.
Key Features
Mersen Amp-Trap 2000® AJT series.
2.25 A current rating.
600 V AC / 500 V DC rated voltage.
Class J time-delay construction.
Ferrule-style terminal configuration.
Non-indicating N version.
Advanced current-limiting technology.
Suitable for motors, transformers, feeders and branch circuits.
Reliable Protection for Industrial Electrical Systems
The AJT2-1/4N is designed to tolerate normal temporary inrush currents generated when motors start or transformers are energised. This controlled time-delay response helps prevent unnecessary fuse operation while maintaining effective protection against sustained overload conditions.
During a severe short circuit, its current-limiting design restricts the peak current and energy passed to downstream equipment. This helps reduce thermal and mechanical stress on conductors, contactors, control components and connected machinery, supporting improved safety and system reliability.
Typical Applications
Industrial control panels.
Motor branch circuits.
Transformer protection.
HVAC and refrigeration equipment.
OEM machinery.
Industrial automation systems.
Electrical distribution panels.
Low-current feeder and branch circuits.
Technical Specifications
Current
2.25 A
Voltage
600 V
Manufacturer
Mersen
Series
Amp-Trap 2000® AJT
Model
AJT2-1/4N
Product type
Class J time-delay fuse
Current rating
2.25 A
Rated voltage AC
600 V AC
Rated voltage DC
500 V DC
Frequency
50 / 60 Hz
Fuse class
Class J
Terminal style
Ferrule
Indication
Non-indicating
AC interrupting rating
200 kA
DC interrupting rating
100 kA
Fuse operation
Time delay and current limiting
HS Code
85361010
Country of Manufacture
Mexico
Frequently Asked Questions
What is the Mersen AJT2-1/4N used for?
The AJT2-1/4N protects industrial branch circuits, motors, transformers, control equipment and machinery against overloads and short circuits.
What is the current rating of the AJT2-1/4N?
The Mersen AJT2-1/4N has a rated current of 2.25 A.
What voltage is the AJT2-1/4N rated for?
The fuse is rated for applications up to 600 V AC and 500 V DC.
What does the N suffix mean?
The N suffix identifies the AJT2-1/4N as a non-indicating fuse without a visual open-fuse indicator.
Why is the AJT2-1/4N suitable for motor and transformer circuits?
Its time-delay characteristics allow temporary starting and energisation currents to pass without unnecessary operation while maintaining protection against sustained overloads and short circuits.
Trusted by Electrical Professionals Worldwide
Mersen Amp-Trap 2000® Class J fuses are trusted by electrical engineers, panel builders and maintenance professionals for compact installation, reliable time-delay operation and effective current-limiting protection.
Current
2.25 A
Voltage
600 V
Manufacturer
Mersen
Series
Amp-Trap 2000® AJT
Model
AJT2-1/4N
Product type
Class J time-delay fuse
Current rating
2.25 A
Rated voltage AC
600 V AC
Rated voltage DC
500 V DC
Frequency
50 / 60 Hz
Fuse class
Class J
Terminal style
Ferrule
Indication
Non-indicating
AC interrupting rating
200 kA
DC interrupting rating
100 kA
Fuse operation
Time delay and current limiting
HS Code
85361010
Country of Manufacture
Mexico
No documents available for this product.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...