Why Choose the Mersen J084119 Medium Time-Lag Miniature Fuse?
The Mersen J084119, also identified by the catalogue number MI5SA25V0.4, is a compact medium time-lag semiconductor miniature fuse designed to protect sensitive electronic components, control equipment and industrial circuitry against overcurrent and short-circuit faults. It forms part of Mersen’s SA and SB range of 5 × 20 mm miniature fuse-links.
Its medium time-lag operating characteristic allows the fuse to tolerate brief current surges and normal inrush conditions without unnecessary operation. At the same time, it provides dependable protection against sustained overloads and short circuits, making it suitable for circuits containing capacitors, transformers, power supplies and semiconductor devices.
With a rated current of 0.4 A, a rated voltage of 250 V AC and a compact 5 × 20 mm ceramic cartridge format, the J084119 is suitable for space-restricted electronic and industrial equipment. Its ferrule terminals enable straightforward installation in compatible fuse clips and holders.
Key Advantages
- Medium time-lag characteristic accommodates short-duration current surges.
- 0.4 A rated current for low-current electronic circuits.
- 250 V AC voltage rating for compatible industrial equipment.
- Compact 5 × 20 mm cylindrical cartridge format.
- 10 kA breaking capacity for dependable fault interruption.
- Replaceable clip-mounted design supports straightforward maintenance.
Key Features
- Mersen SA semiconductor miniature fuse series.
- Catalogue number: MI5SA25V0.4.
- 0.4 A rated current.
- 250 V AC rated voltage.
- Medium time-lag operating characteristic.
- Ceramic cylindrical cartridge body.
- Nickel-plated brass ferrule end caps.
- RoHS-compliant construction.
Reliable Protection with Inrush Current Tolerance
Electronic equipment can experience brief current peaks when switched on or during normal operation. The Mersen J084119 uses a medium time-lag fuse element that tolerates these temporary surges while still disconnecting the circuit when a sustained overload or short circuit occurs.
This operating characteristic helps reduce nuisance fuse operation in equipment containing transformers, capacitive loads and power supplies. Its compact ceramic cartridge fits compatible 5 × 20 mm fuse holders, supporting convenient installation, inspection and replacement.
Typical Applications
- Industrial control and automation equipment.
- Electronic power supplies and control modules.
- Transformer secondary circuit protection.
- Instrumentation and measuring equipment.
- Semiconductor and electronic assemblies.
- Circuits with temporary inrush currents.
