Why Choose the Mersen Q076305 High-Speed Semiconductor Fuse?
The Mersen Q076305 is a high-performance Protistor® high-speed cylindrical fuse-link designed to protect sensitive power semiconductor components against damaging short-circuit currents. Identified by catalogue number FD27GB66V40T, it forms part of Mersen’s 27 × 60 mm gR (gRB) range developed for demanding DC power and railway auxiliary applications.
This fuse-link provides rapid, current-limiting fault interruption with low let-through energy, helping to minimise electrical and thermal damage to protected semiconductor devices. Its low I²t characteristics, reduced power losses and extended operating life make it suitable for modern DC equipment requiring faster protection than conventional industrial fuse-links can provide.
With a rated current of 40 A, an IEC voltage rating of 660 V DC and a compact 27 × 60 mm cylindrical format, the Mersen Q076305 provides dependable protection for railway systems, converters, rectifiers and industrial DC circuits. Its integrated striker provides clear fuse-operation indication for easier maintenance and fault identification.
Key Advantages
- High-speed fuse-link designed for semiconductor protection.
- 40 A rated current for demanding DC power circuits.
- 660 V DC IEC voltage rating.
- Low I²t performance helps minimise damage to protected components.
- 50 kA DC interrupting capacity supports reliable fault clearance.
- Integrated mechanical striker simplifies fuse-status identification.
Key Features
- Mersen Protistor® semiconductor fuse range.
- FD27GB66V40T catalogue number.
- 40 A rated current.
- 660 V DC rated voltage.
- gR operating class with gRB design characteristics.
- Compact 27 × 60 mm cylindrical fuse-link format.
- Fast-acting and current-limiting performance.
- Integrated mechanical striker indication.
- Silver-plated copper ferrule terminals.
- RoHS-compliant ceramic construction.
Reliable Protection for Modern DC Equipment
Power semiconductor devices can be permanently damaged by short-circuit currents that develop within milliseconds. High-speed fuse-links such as the Mersen Q076305 interrupt these faults rapidly, limiting the energy reaching sensitive components such as diodes, thyristors, rectifiers and power conversion assemblies.
The Mersen Protistor® DC range is developed to meet the protection requirements of modern DC equipment. Its low I²t characteristics, reduced watt losses and suitability for elevated operating temperatures support dependable performance in railway, industrial conversion and auxiliary power systems.
Typical Applications
- Railway power circuits.
- Railway auxiliary electrical systems.
- Industrial DC power supplies.
- Power converters and rectifiers.
- Semiconductor protection circuits.
- Battery charging and energy systems.
