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MERSEN FUSE 6,921 CP URGD 27.60 80 6,921CPURGD27.60/80
High-speed cylindrical fuse with aR characteristic for semiconductor protection, rated 80A at 690VAC with integral striker indication.
£45.74
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.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Size | 27x60 mm | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | B076821 | |
| Catalogue No | FR27UD69V80T | |
| Description | High-Speed Cylindrical Fuse Protistor® Size 27x60 aR 690VAC IEC 80A With Striker | |
| EAN/UPC Code | 3605340019971 | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 80 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 27x60 | |
| Mounting | Clip | |
| Clearing I2t At Rated Voltage | 3.75 kA²s | |
| Melting I2t | 0.86 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Design Details | URGD | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | Ferrule | |
| Product Diameter | 27 mm | |
| Product Length | 60.3 mm | |
| Sell Pack Quantity | 10 EA | |
| Sell Pack Weight | 0.8 kg | |
| Sell Pack Width | 123 mm | |
| Sell Pack Length | 138 mm | |
| Sell Pack Height | 30 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.08 kg | |
| Power Dissipation at Rated Current Value | 24.6 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen B076821 used for?
The B076821 protects power semiconductor devices used in industrial drives, converters, inverters, rectifiers and other power electronic equipment against damaging short-circuit currents.
What is the current rating of this fuse?
The Mersen B076821 has a rated current of 80 A.
What voltage is the FR27UD69V80T rated for?
The fuse is rated for operation at up to 690 V AC according to IEC specifications.
What does the aR fuse characteristic mean?
The aR characteristic identifies an ultra-fast partial-range fuse designed to protect power semiconductors against short-circuit currents. Separate overload protection is generally required.
What is the purpose of the integrated striker?
The mechanical striker operates when the fuse clears a fault and can activate compatible indication or monitoring accessories to help maintenance personnel identify the operated fuse.
Trusted for Industrial Semiconductor Protection
Mersen Protistor® high-speed fuses are widely specified by automation engineers, panel builders and equipment manufacturers for reliable protection of critical semiconductor-based power systems.
