Why Choose the Mersen Q090542 5ST Miniature Fuse?
The Mersen Q090542, also identified by the catalogue reference MI5ST25V0.8, is a compact 5 x 20 mm time-delay glass cartridge fuse designed to provide dependable overcurrent protection for electrical equipment, industrial controls and electronic circuits. As part of the established Mersen 5ST IEC miniature fuse series, it withstands brief start-up currents while protecting connected equipment against sustained overloads and short circuits.
The Q090542 features a transparent glass body that allows straightforward visual inspection of the internal fuse element. Its standard cylindrical format provides compatibility with suitable 5 x 20 mm fuse holders and mounting clips, making it practical for original equipment manufacture, control-panel construction and routine maintenance replacement.
With a rated current of 800 mA and a rated voltage of 250 V AC, this fuse is suitable for circuits containing transformers, power supplies, control components and other equipment that may experience temporary inrush currents during normal start-up.
Key Advantages
- Reliable time-delay miniature fuse for electrical equipment protection.
- 800 mA current rating for accurately matched control circuits.
- 250 V AC voltage rating suitable for industrial and electronic applications.
- Withstands temporary start-up and inrush currents without unnecessary operation.
- Compact 5 x 20 mm cartridge format for space-efficient installation.
- Transparent glass body enables convenient visual inspection.
Key Features
- Mersen 5ST IEC miniature fuse series.
- Catalogue reference: MI5ST25V0.8.
- 800 mA rated current.
- 250 V AC rated voltage.
- Time-delay operating characteristic.
- Standard 5 x 20 mm cylindrical fuse size.
- Glass cartridge body for visual fuse-element inspection.
- Suitable for compatible fuse holders and mounting clips.
Dependable Protection for Circuits with Inrush Current
Time-delay fuses such as the Mersen Q090542 are designed to tolerate short-duration current surges that occur when transformers, power supplies and other electrical loads are energised. This helps prevent nuisance fuse operation during normal start-up while maintaining dependable protection against sustained overloads and short circuits.
The standard 5 x 20 mm format enables straightforward installation and replacement within compatible equipment. Its glass construction also allows engineers to inspect the fuse element visually when diagnosing electrical faults or carrying out routine maintenance.
Typical Applications
- Industrial control panels.
- Electronic power supplies.
- Transformers and inductive circuits.
- Automation and control equipment.
- Instrumentation and measuring devices.
- OEM machinery and electrical assemblies.
