Why Choose the Mersen N075958 Protistor® Semiconductor Fuse?
The Mersen N075958 is a high-speed aR semiconductor fuse designed to provide rapid short-circuit protection for sensitive power electronic components. Also identified as FR27UQ69V50T and 6,921 CP URQ 27.60 50, this cylindrical fuse forms part of the proven Mersen Protistor® URQ 27×60 series.
Engineered for demanding industrial power applications, the N075958 offers fast fault interruption and effective current limitation to help protect IGBTs, thyristors, diodes, rectifiers and other semiconductor devices. Its ceramic cartridge construction provides excellent resistance to thermal and mechanical stress, while the integrated striker supports rapid identification or remote signalling when the fuse has operated.
With a rated current of 50 A, a rated voltage of 690 V AC and a compact 27 × 60 mm cylindrical format, the Mersen N075958 is suitable for variable-speed drives, soft starters, industrial converters and other systems requiring dependable semiconductor short-circuit protection.
Key Advantages
- High-speed aR fuse designed for semiconductor protection.
- 50 A rated current for industrial power electronic circuits.
- 690 V AC voltage rating for demanding applications.
- Low energy let-through helps protect sensitive semiconductor components.
- Integrated striker indicator supports faster fault identification.
- Compact 27 × 60 mm cylindrical design for compatible fuse holders.
Key Features
- Mersen Protistor® URQ high-speed fuse series.
- 50 A rated current.
- 690 V AC rated voltage.
- aR operating class for semiconductor short-circuit protection.
- Extremely high fault-current interruption capability.
- Integrated striker indication.
- 27 × 60 mm ceramic cylindrical body.
- Ferrule terminals for installation in compatible fuse holders.
- Low I²t characteristics for effective current limitation.
- Designed in accordance with semiconductor fuse requirements.
Rapid Short-Circuit Protection for Power Electronics
The Mersen N075958 is designed to interrupt dangerous fault currents before excessive electrical energy can damage semiconductor devices. Its fast operating characteristic and low I²t performance help minimise thermal stress within power electronic equipment, reducing the likelihood of extensive component damage and unplanned downtime.
As an aR-class fuse, the N075958 provides partial-range protection focused on high fault currents and short circuits. It should be coordinated with suitable overload protection where required by the application, equipment manufacturer or electrical installation design.
Typical Applications
- Variable-frequency drives and AC drive systems.
- Industrial soft starters.
- Power converters and rectifiers.
- Industrial inverters.
- Thyristor and diode circuits.
- Uninterruptible power supply equipment.
- Industrial automation machinery.
- Renewable energy conversion systems.
