Why Choose the Mersen W078909 High-Speed Miniature Fuse?
The Mersen W078909, catalogue number MI6SA40V0.8, is a 6.3 × 32 mm semiconductor miniature fuse designed to provide dependable overcurrent protection for sensitive electronic and semiconductor equipment. Part of Mersen's SA 400 V miniature fuse range, it features a medium time-lag characteristic that protects electronic circuits while accommodating temporary inrush currents.
With a rated current of 0.8 A and a 400 V AC voltage rating, the W078909 offers reliable protection for industrial electronics, power supplies, control equipment and semiconductor devices. Its ceramic construction and high breaking capacity ensure dependable performance in demanding electrical environments.
Designed for clip mounting, this fuse provides straightforward installation and replacement while maintaining excellent electrical performance. Its compact 6.3 × 32 mm format makes it suitable for equipment where space-saving and reliable circuit protection are essential.
Key Advantages
- Designed for semiconductor and sensitive electronic circuit protection.
- 0.8 A current rating for precision electronic applications.
- 400 V AC rated voltage.
- Medium time-lag characteristic tolerates normal inrush currents.
- Compact 6.3 × 32 mm miniature fuse format.
- Ceramic body provides high mechanical and thermal strength.
- Clip mounting enables quick installation and replacement.
- Very high breaking capacity for dependable fault interruption.
Key Features
- Mersen SA 400 V semiconductor miniature fuse series.
- Catalogue number: MI6SA40V0.8
- 0.8 A rated current.
- 400 V AC rated voltage.
- Medium time-lag (SA) operating characteristic.
- 6.3 × 32 mm ceramic fuse body.
- Clip mounting installation.
- Pre-arcing I²t: 0.17 A²s.
- Clearing I²t: 0.38 A²s.
- RoHS and UKCA compliant.
Reliable Protection for Electronic Equipment
The Mersen W078909 is engineered to protect semiconductor devices and electronic assemblies from damaging overcurrents. Its medium time-lag characteristic allows temporary surge currents while providing rapid fault interruption when abnormal conditions occur.
The robust ceramic body and high interrupting capability help maximise equipment reliability, making this fuse suitable for industrial automation systems, electronic controls and power conversion equipment where dependable circuit protection is critical.
Typical Applications
- Semiconductor protection.
- Industrial electronic equipment.
- Power supplies and converters.
- Automation and control panels.
- Measurement and instrumentation systems.
- Electronic control circuits.
- OEM machinery.
- Industrial power electronics.
