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MERSEN FUSE 250V SA 0,125 A 5.20 MI5SA25V0,125
Mersen L084121 MI5SA25V0.125 medium time-lag semiconductor miniature fuse rated at 0.125 A and 250 V AC, with a 5 x 20 mm ceramic clip-mounted design.
£5.45
Why Choose the Mersen L084121 Medium Time-Lag Semiconductor Fuse?
The Mersen L084121 is a compact medium time-lag semiconductor miniature fuse designed to protect sensitive electronic components, semiconductor devices and control apparatus against overcurrent and short-circuit faults. Part of the Mersen MI5SA fuse series, it combines dependable fault protection with the ability to tolerate brief inrush currents without unnecessary operation.
Its SA medium time-lag characteristic makes the fuse suitable for circuits that experience short-duration current surges during start-up or switching. This helps reduce nuisance fuse operation while maintaining reliable protection for valuable electronic and industrial equipment.
With a rated current of 0.125 A, a rated voltage of 250 V AC and a compact 5 × 20 mm ceramic body, the Mersen L084121 is ideal for low-current circuits where installation space is limited. Its ferrule terminals and clip-mounted format enable straightforward installation in compatible fuse holders.
Key Advantages
- Medium time-lag semiconductor fuse for sensitive electronic circuits.
- 0.125 A rated current for low-current protection.
- 250 V AC voltage rating.
- Handles brief inrush currents while maintaining overcurrent protection.
- 10 kA minimum interrupting rating for dependable fault clearance.
- Compact 5 × 20 mm ceramic cartridge format.
Key Features
- Mersen MI5SA semiconductor miniature fuse series.
- 0.125 A rated current.
- 250 V AC rated voltage.
- SA medium time-lag operating characteristic.
- 5 × 20 mm cylindrical fuse size.
- Ferrule terminal construction.
- Clip mounting for compatible fuse holders.
- Ceramic insulating body.
- RoHS-compliant construction.
Reliable Protection with Inrush Current Tolerance
Some electronic circuits draw a temporary surge of current when energised. The Mersen L084121 uses a medium time-lag characteristic that allows it to withstand these normal short-term surges while still interrupting sustained overloads and short-circuit faults.
This balance between surge tolerance and dependable fault protection makes the fuse suitable for power supplies, control apparatus, instrumentation and semiconductor-based equipment where nuisance fuse operation could cause unnecessary downtime.
Typical Applications
- Semiconductor device protection.
- Measuring and control apparatus.
- Industrial electronic equipment.
- Power supply input and control circuits.
- Automation and process control systems.
- Electronic test and instrumentation equipment.
Technical Specifications
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| Current | 0.125 A | |
|---|---|---|
| Voltage | 250 V | |
| Device Type | Fuse link | |
| Fuse Type | Miniature, Semiconductor | |
| Fuse Size | 5x20 mm | |
| Fuse Class | Time delay | |
| Manufacturer | Mersen | |
| Series | MI5SA Semiconductor Miniature Fuses | |
| Item number | L084121 | |
| Catalogue number | MI5SA25V0.125 | |
| Product type | Medium time-lag semiconductor miniature fuse | |
| Rated current | 0.125 A | |
| Rated voltage | 250 V AC | |
| Current type | AC | |
| Speed / characteristic | Medium time-lag | |
| Design characteristic | SA | |
| Fuse size | 5 × 20 mm | |
| Mounting type | Clip mounting | |
| Terminal type | Ferrule | |
| Minimum interrupting rating | 10 kA | |
| Melting I²t | 0.002 A²s | |
| Clearing I²t at rated voltage | 0.006 A²s | |
| Body material | Ceramic | |
| Product diameter | 5 mm | |
| Product length | 20 mm | |
| Product weight | approx. 0.0012 kg | |
| Compliance | RoHS compliant | |
| EAN / UPC | 3605340060560 |
Frequently Asked Questions
What is the Mersen L084121 used for?
The Mersen L084121 protects sensitive semiconductor devices, electronic components and control apparatus against sustained overcurrent and short-circuit faults.
What is the current rating of the Mersen L084121?
The fuse has a rated current of 0.125 A, which is equivalent to 125 mA.
What voltage is the Mersen L084121 rated for?
The Mersen L084121 is rated for operation at up to 250 V AC.
What does the SA medium time-lag characteristic mean?
The SA medium time-lag characteristic allows the fuse to withstand brief start-up or switching surges while still responding to sustained overload and short-circuit conditions.
What size is the Mersen L084121 fuse?
It is a cylindrical miniature fuse measuring 5 × 20 mm, designed for clip mounting in a compatible fuse holder.
Trusted by Electrical and Electronic Engineers Worldwide
Mersen semiconductor miniature fuses are widely selected for reliable protection of sensitive electronic equipment, offering dependable fault interruption and resistance to normal short-duration inrush currents.
