Why Choose the Mersen ATQR3/4 Class CC Fuse?
The Mersen ATQR3/4 is a premium Class CC time-delay fuse designed to provide reliable overcurrent protection for industrial control transformers, relays, solenoids and other inductive electrical loads. As part of the trusted Mersen Amp-Trap® 2000 ATQR series, it combines exceptional current-limiting performance with a time-delay characteristic that accommodates temporary inrush currents while rapidly interrupting overloads and short circuits.
Designed specifically for industrial branch circuit protection, the ATQR3/4 helps minimise nuisance fuse operation during transformer energisation while protecting valuable electrical equipment from damaging fault currents. Its rejection-style Class CC construction also helps prevent incorrect fuse replacement when installed in a compatible Class CC fuse holder.
With a rated current of 0.75 A (3/4 A), a voltage rating of 600 V AC and 300 V DC, the ATQR3/4 is ideally suited to sensitive industrial control circuits, automation systems and OEM machinery requiring dependable low-current protection.
Key Advantages
- Compact Class CC time-delay fuse for industrial control applications.
- 0.75 A (3/4 A) current rating for sensitive control transformer protection.
- 600 V AC and 300 V DC voltage ratings.
- Time-delay operation withstands transformer and equipment inrush currents.
- Highly current-limiting construction reduces fault energy.
- Rejection-style design helps prevent incorrect fuse replacement.
Key Features
- Mersen Amp-Trap® 2000 ATQR series.
- 0.75 A (3/4 A) rated current.
- 600 V AC maximum voltage.
- 300 V DC maximum voltage.
- Class CC rejection-style ferrule fuse.
- Time-delay operating characteristic.
- 200 kA AC interrupting rating.
- 100 kA DC interrupting rating.
- Compact 10.4 × 38.1 mm cylindrical construction.
Reliable Protection for Industrial Control Systems
The Mersen ATQR3/4 is specifically engineered to protect low-current industrial control transformers and inductive equipment. Its time-delay characteristic allows normal transformer magnetising current and equipment start-up surges to pass without nuisance operation while maintaining dependable protection against sustained overloads and short circuits.
Its advanced current-limiting construction limits thermal and mechanical stress during fault conditions, helping protect transformers, conductors, relays and other control components while improving equipment reliability and reducing maintenance costs.
Typical Applications
- Industrial control transformers.
- Control panels and switchboards.
- Relays, solenoids and contactors.
- PLC and automation control circuits.
- OEM machinery.
- Industrial automation systems.
