Why Choose the Mersen B076821 FR27UD69V80T Protistor® High-Speed Fuse?
The Mersen B076821, also identified by catalogue number FR27UD69V80T, is a high-performance Protistor® high-speed cylindrical semiconductor fuse with striker. It is engineered to provide rapid short-circuit protection for sensitive power semiconductor devices used in demanding industrial power electronic systems.
As part of the Mersen Protistor® 27 × 60 aR URGD range, this fuse offers exceptionally high breaking capacity and low let-through energy. Its fast response helps reduce thermal and electrical stress on components such as IGBTs, thyristors, rectifier diodes and power transistors during severe fault conditions.
With a rated current of 80 A, a rated voltage of 690 V AC and an interrupting capacity of 200 kA, the B076821 is suitable for industrial drives, converters, inverters and power supplies. Its integrated striker provides mechanical fuse-operation indication for use with compatible fuse holders and monitoring accessories.
Key Advantages
- Ultra-fast aR fuse for power semiconductor short-circuit protection.
- 80 A rated current for industrial power electronic systems.
- 690 V AC IEC voltage rating.
- Exceptional 200 kA breaking capacity.
- Integrated mechanical striker supports fuse-status monitoring.
- Compact 27 × 60 mm cylindrical design for clip mounting.
Key Features
- Mersen Protistor® semiconductor protection fuse.
- Item number: B076821.
- Catalogue number: FR27UD69V80T.
- 80 A rated current.
- 690 V AC rated voltage.
- aR utilisation category for partial-range semiconductor protection.
- 200 kA maximum AC interrupting rating.
- Integrated striker indication system.
- Silver-plated copper ferrule terminals.
- Ceramic fuse body for dependable industrial performance.
Reliable Protection for Power Semiconductors
High-speed semiconductor fuses such as the Mersen B076821 are designed to interrupt severe fault currents before excessive energy reaches vulnerable electronic components. Their rapid current-limiting action helps reduce damage to semiconductors and surrounding equipment, supporting improved system reliability and reduced downtime.
The aR operating characteristic provides partial-range protection against short-circuit currents. Separate overload protection is normally required elsewhere within the circuit. The integrated striker also allows compatible equipment to provide visual or electrical indication when the fuse has operated.
Typical Applications
- Variable frequency drives and industrial motor drives.
- Power converters and rectifier systems.
- Industrial inverters.
- Uninterruptible power supplies.
- Soft starters and motor-control equipment.
- Renewable energy conversion systems.
- Automation panels and semiconductor assemblies.
