Why Choose the Mersen R085621 High Voltage Motor Protection Fuse?
The Mersen R085621 is a high performance Limitor® high voltage back-up fuse engineered to provide dependable short circuit protection for medium voltage motors and industrial switchgear. Designed for demanding electrical distribution systems, this fuse delivers fast fault clearance while withstanding the repeated peak currents associated with motor starting.
Part of the proven Mersen Limitor® aSJB/D series, the R085621 combines high interrupting performance with a robust construction using silver-plated fuse elements, silver-plated brass end caps and a durable melamine fibreglass body. Its integrated striker mechanism allows reliable operation with compatible switchgear and protection systems.
Rated at 7.2 kV AC and 250 A, the Mersen R085621 is ideally suited for protecting medium voltage motors in industrial plants, utilities, mining operations and critical infrastructure where dependable protection is essential for operational continuity.
Key Advantages
- Designed specifically for medium voltage motor protection.
- 7.2 kV AC voltage rating for industrial applications.
- 250 A current rating.
- Integrated 20 N striker for reliable tripping indication.
- Excellent current limiting characteristics reduce fault energy.
- Withstands repeated motor starting peak currents.
- Manufactured using high quality silver-plated conductive materials.
- Complies with IEC requirements for medium voltage fuse-links.
Key Features
- Manufacturer: Mersen.
- Series: Limitor® aSJB/D High Voltage Back-up Fuses.
- Catalogue number: 45ASD72V250P-3.
- Rated voltage: 7.2 kV AC.
- Rated current: 250 A.
- Fuse size: Ø76 mm × 442 mm.
- Integrated 20 N striker mechanism.
- Melamine fibreglass insulating body.
- Silver-plated copper fuse elements.
- Silver-plated brass terminals.
Reliable Protection for Medium Voltage Motors
High voltage back-up fuses play a critical role in protecting motors and associated equipment against destructive short circuit faults. The Mersen R085621 rapidly clears high fault currents while allowing normal motor starting conditions, helping maximise equipment availability and minimise downtime.
The Limitor® range has been trusted worldwide for decades in medium voltage switchgear, motor control centres and power distribution systems, providing dependable protection for valuable industrial assets.
Typical Applications
- Medium voltage motor protection.
- Industrial switchgear.
- Motor control centres.
- Mining and quarrying equipment.
- Water and wastewater treatment plants.
- Power generation facilities.
- Oil and gas installations.
- Utility distribution networks.
