Why Choose the Mersen Y090549 5ST Time-Delay Miniature Fuse?
The Mersen Y090549, catalogue reference MI5ST25V4/100, is a dependable 5 × 20 mm time-delay miniature glass fuse designed to protect industrial equipment, electrical distribution circuits and electronic devices against overloads and short-circuit faults. Its time-delay operating characteristic allows it to withstand temporary inrush currents while providing reliable protection against sustained overcurrent conditions.
As part of the Mersen 5ST IEC Miniature Fuse series, the Y090549 is ideal for applications incorporating motors, transformers, relays and switched-mode power supplies where temporary start-up surges are expected. The transparent glass body enables quick visual inspection of the fuse element, simplifying maintenance and fault diagnosis.
With a rated current of 4 A, a rated voltage of 250 V AC and a 35 A breaking capacity, the Y090549 provides dependable circuit protection in a standard 5 × 20 mm format compatible with suitable miniature fuse holders.
Key Advantages
- Compact 5 × 20 mm miniature glass cartridge fuse.
- Time-delay characteristic withstands temporary inrush currents.
- 4 A rated current for industrial and electronic equipment.
- 250 V AC rated voltage.
- 35 A breaking capacity for dependable fault interruption.
- Transparent glass body enables quick visual inspection.
- Industry-standard dimensions simplify replacement and maintenance.
Key Features
- Mersen 5ST IEC Miniature Fuse series.
- MI5ST25V4/100 catalogue reference.
- 5 × 20 mm cylindrical glass fuse.
- 4 A nominal current rating.
- 250 V AC rated voltage.
- Time-delay operating characteristic.
- 35 A breaking capacity.
- 173.5 A²s pre-arcing I²t.
- Glass body with nickel-plated brass contact caps.
- Manufactured in accordance with IEC 60127-2.
Reliable Protection for Equipment with Inrush Currents
Time-delay miniature fuses are specifically designed to tolerate the temporary current surges produced when motors, transformers and power supplies are energised. This helps reduce nuisance fuse operation while continuing to protect equipment from prolonged overloads and short-circuit faults.
The Mersen Y090549 combines dependable electrical performance with an industry-standard 5 × 20 mm format, making it suitable for industrial automation, instrumentation, OEM machinery and electrical control systems requiring reliable replaceable circuit protection.
Typical Applications
- Industrial control panels.
- Motor control circuits.
- Transformer protection.
- Power supplies.
- Electronic equipment.
- Instrumentation and measurement systems.
- OEM machinery.
- General industrial electrical installations.
