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MERSEN FUSE 250V 5ST 0,25A 5.20 MI5ST25V0,25
Mersen K090537 MI5ST25V0.25 time-delay 5 x 20 mm glass miniature cartridge fuse rated at 0.25 A and 250 V AC with a 35 A breaking capacity.
Why Choose the Mersen K090537 5ST Time-Delay Miniature Fuse?
The Mersen K090537 is a compact and dependable time-delay miniature cartridge fuse designed to protect electrical equipment, industrial controls and distribution circuits against sustained overloads and short circuits. Also identified by the catalogue reference MI5ST25V0.25, it forms part of the Mersen 5ST IEC miniature fuse series.
With a rated current of 0.25 A, equivalent to 250 mA, and a rated voltage of 250 V AC, the K090537 is designed to tolerate brief start-up and inrush currents without unnecessary operation. Its time-delay characteristic makes it suitable for equipment containing motors, transformers, power supplies and other loads that produce temporary current surges.
The fuse features a standard 5 × 20 mm glass cartridge body with nickel-plated brass contact caps. Its compact clip-mounted format allows straightforward installation in compatible miniature fuse holders, while the transparent body enables convenient visual inspection during maintenance.
Key Advantages
- Time-delay operating characteristic withstands temporary inrush currents.
- 0.25 A current rating for sensitive electrical circuits.
- 250 V AC voltage rating.
- Compact 5 × 20 mm cartridge format.
- Glass body enables visual inspection of the fuse element.
- 35 A breaking capacity for dependable fault interruption.
- Compatible with standard 5 × 20 mm miniature fuse holders.
Key Features
- Mersen 5ST IEC miniature fuse series.
- MI5ST25V0.25 catalogue reference.
- 0.25 A rated current.
- 250 V AC rated voltage.
- Time-delay fuse characteristic.
- 35 A AC breaking capacity.
- 0.51 A²s melting I²t.
- Glass insulating body.
- Nickel-plated brass contact caps.
- Standard clip-mounted cartridge construction.
- RoHS-compliant design.
Reliable Protection for Circuits with Inrush Current
Time-delay miniature fuses are designed to withstand brief, harmless current surges that occur when motors, transformers and power supplies are energised. This controlled delay helps prevent nuisance fuse operation while ensuring that sustained overloads and short circuits are safely interrupted.
The Mersen 5ST range provides compact and reliable protection for industrial electrical equipment. When correctly selected and installed, the K090537 helps protect wiring and components while supporting dependable equipment start-up and operation.
Typical Applications
- Industrial control panels.
- Small motors and motor control circuits.
- Transformers and auxiliary circuits.
- Power supplies and electronic equipment.
- Instrumentation and monitoring systems.
- OEM machinery and automation equipment.
Technical Specifications
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| Current | 0.25 A | |
|---|---|---|
| Voltage | 250 V | |
| Device Type | Fuse link | |
| Fuse Type | Miniature | |
| Fuse Size | 5x20 mm | |
| Fuse Class | Time delay | |
| Manufacturer | Mersen | |
| Series | 5ST IEC Miniature Fuses | |
| Model | K090537 | |
| Manufacturer item number | K090537Q | |
| Catalogue number | MI5ST25V0.25 | |
| Product type | Time-delay miniature cartridge fuse | |
| Fuse size | 5 × 20 mm | |
| Rated current | 0.25 A / 250 mA | |
| Rated voltage | 250 V AC | |
| Supply type | AC | |
| Operating characteristic | Time delay | |
| Breaking capacity | 35 A AC | |
| Melting I²t | 0.51 A²s | |
| Power dissipation at rated current | 0.22 W | |
| Maximum voltage drop | 0.33 V | |
| Body material | Glass | |
| Contact caps | Nickel-plated brass | |
| Mounting method | Clip mounting | |
| Product diameter | 5 mm | |
| Product length | 20 mm | |
| Standard | IEC 60127-2 Sheet 3 | |
| Compliance | RoHS compliant | |
| EAN / UPC | 3605340091625 |
Frequently Asked Questions
What is the Mersen K090537 used for?
The Mersen K090537 protects electrical and industrial equipment against sustained overloads and short circuits while tolerating brief start-up currents.
What is the current rating of the K090537?
The fuse has a rated current of 0.25 A, equivalent to 250 mA.
What voltage is this fuse rated for?
The Mersen K090537 is rated for AC circuits operating at up to 250 V.
Is the K090537 a fast-acting or time-delay fuse?
It is a time-delay fuse designed to tolerate temporary inrush currents before operating under a sustained overcurrent condition.
What fuse holder is compatible with the K090537?
The fuse is suitable for correctly rated fuse holders designed to accept standard 5 × 20 mm miniature cartridge fuses.
Trusted by Electrical Engineers Worldwide
Mersen miniature fuses are widely selected by panel builders, equipment manufacturers and maintenance engineers for dependable overcurrent protection, consistent operation and reliable performance in industrial applications.
