Why Choose the Mersen W081439 Protistor High-Speed Fuse?
The Mersen W081439, catalogue number FD36GB200V40, is a high-speed cylindrical semiconductor fuse designed to protect sensitive DC power electronic equipment against damaging overloads and short-circuit currents. Part of the Mersen Protistor® 36 × 250 mm gR (gRB) series, it provides dependable protection for railway power systems, auxiliary circuits and demanding high-voltage DC installations.
This fuse-link is developed for modern DC equipment operating under challenging electrical and thermal conditions. Its low I²t performance helps reduce the energy transferred to protected semiconductor components during short circuits, while its reduced power losses and robust construction support reliable operation and a long service life.
With a rated current of 40 A, a rated voltage of 2000 V DC and a maximum DC breaking capacity of 30 kA, the W081439 is suitable for protecting converters, rectifiers, inverters and railway auxiliary power equipment. Its cylindrical ferrule design enables installation in compatible fuse clips rated for the applicable voltage and current.
Key Advantages
- High-speed gR semiconductor fuse for full-range DC protection.
- 40 A rated current for power electronic applications.
- 2000 V DC IEC voltage rating for high-voltage systems.
- Low I²t performance helps minimise damage to semiconductor components.
- Maximum DC breaking capacity of 30 kA.
- Low power losses support efficient equipment operation.
- Designed for dependable performance at elevated temperatures.
- Robust ceramic construction provides excellent thermal resistance.
Key Features
- Mersen Protistor® high-speed fuse series.
- Manufacturer item number W081439.
- Catalogue number FD36GB200V40.
- 40 A rated current.
- 2000 V DC IEC rated voltage.
- gR speed and utilisation characteristic.
- gRB design for semiconductor protection.
- 36 × 250 mm cylindrical fuse format.
- Silver-plated copper ferrule terminals.
- Clip-mounting configuration.
- Ceramic insulating body.
- RoHS-compliant construction.
Reliable Protection for High-Voltage DC Equipment
Power semiconductor components can be permanently damaged within milliseconds when exposed to excessive fault current. The Mersen W081439 is engineered to interrupt these currents rapidly, limiting the electrical energy transferred to protected devices and reducing the risk of damage to converters, rectifiers and associated power electronic equipment.
Its gR characteristic provides full-range protection against overload and short-circuit currents. Combined with its high 2000 V DC rating, ceramic body and silver-plated copper ferrules, the fuse is well suited to railway and industrial DC systems where dependable high-speed protection is required.
Typical Applications
- Railway power and auxiliary circuits.
- Industrial high-voltage DC converters.
- Semiconductor rectifier assemblies.
- Power inverters and frequency converters.
- DC traction equipment.
- Battery energy storage systems.
- Renewable energy power conversion equipment.
- High-voltage DC distribution systems.
