Why Choose the Mersen ATQR1/4 Time-Delay Fuse?
The Mersen ATQR1/4 is a 0.25 A Class CC time-delay fuse designed to provide dependable branch-circuit protection for industrial control systems, control transformers and other low-current equipment subject to temporary inrush currents. As part of the Mersen Amp-Trap 2000® ATQR series, it combines high current-limiting performance with a compact rejection-style cartridge design. The ATQR series is specifically engineered for protecting control transformers, solenoids and similar inductive loads.
Rated at 600 V AC and 300 V DC, the ATQR1/4 withstands brief, non-damaging current surges while providing reliable protection against sustained overloads and short-circuit faults. Its time-delay characteristic helps minimise nuisance fuse operation during normal equipment energisation.
The fuse uses the standard Class CC rejection cartridge format, preventing installation in ordinary non-rejection fuse holders. When installed in a compatible Class CC fuse holder, it delivers compact, high-performance protection for industrial control panels, OEM machinery and automation systems.
Key Advantages
- Class CC branch-circuit protection for industrial electrical equipment.
- 0.25 A current rating ideal for sensitive control and instrumentation circuits.
- 600 V AC / 300 V DC rating for demanding industrial applications.
- Time-delay performance accommodates temporary transformer and inductive load inrush currents.
- Current-limiting construction helps reduce fault energy reaching downstream equipment.
- Rejection-style design helps prevent incorrect fuse replacement.
Key Features
- Mersen Amp-Trap 2000® ATQR series.
- 0.25 A rated current.
- 600 V AC / 300 V DC maximum voltage rating.
- Class CC time-delay fuse.
- Current-limiting operation.
- 200 kA RMS symmetrical interrupting rating.
- Ferrule-style cartridge terminals.
- Compatible with Class CC rejection fuse holders.
The Mersen ATQR1/4 is specifically designed for low-current industrial control applications where transformers, relays and other inductive devices generate temporary inrush currents during energisation. Its time-delay characteristic allows these normal operating conditions while maintaining dependable protection against overloads and fault currents.
Its Class CC current-limiting construction rapidly interrupts high fault currents, helping protect wiring, terminals and sensitive electrical equipment. The rejection design also ensures compatibility only with correctly rated Class CC fuse holders.
Typical Applications
- Industrial control transformers.
- PLC and automation control panels.
- Instrumentation circuits.
- Relay and solenoid circuits.
- OEM machinery.
- Industrial branch circuits.
