Why Choose the Mersen R078169 High Voltage Motor Protection Fuse?
The Mersen R078169 is a robust high voltage motor protection back-up fuse-link developed to safeguard medium voltage motors, switchgear and associated electrical equipment against high fault currents. As part of the proven Mersen Limitor® aSJB/D series, it is engineered to withstand the repeated inrush currents associated with motor starting while providing fast current-limiting protection during short-circuit conditions.
Manufactured using silver-plated copper fuse elements, silver-plated brass terminals and a melamine fibreglass body, the R078169 delivers dependable electrical performance and a long operational life in demanding industrial environments. It also incorporates a 20 N striker for fault indication and operation of compatible switchgear.
Rated at 7.2 kV AC and 250 A, with a 60 kA breaking capacity, the R078169 provides reliable protection for medium voltage motor circuits in industrial, utility and infrastructure applications.
Key Advantages
- Designed specifically for medium voltage motor protection.
- 7.2 kV AC rated voltage for industrial motor circuits.
- 250 A rated current.
- 60 kA breaking capacity for dependable fault interruption.
- Current-limiting design helps minimise fault energy.
- Integrated 20 N striker for indication and switchgear operation.
- Withstands repeated motor starting currents.
- Manufactured using premium silver-plated conductive components.
Key Features
- Mersen Limitor® aSJB/D high voltage motor fuse-link.
- Catalogue number: 45ASB72V250P-2.
- Rated voltage: 7.2 kV AC.
- Rated current: 250 A.
- Breaking capacity: 60 kA.
- Fuse body: 88 mm diameter × 292 mm length.
- Integrated 20 N striker mechanism.
- Clip mounting with cylindrical terminals.
- Complies with IEC 60282-1 and IEC 60644.
Reliable Protection for Medium Voltage Motors
The Mersen R078169 is designed to interrupt high fault currents rapidly while tolerating the repetitive inrush currents generated during motor starting. Its current-limiting characteristics reduce mechanical and thermal stress on motors, switchgear and connected equipment, helping maximise system reliability.
Its integrated striker mechanism enables fault indication or operation of compatible switching devices, providing enhanced protection coordination within medium voltage installations.
Typical Applications
- Medium voltage motor protection.
- Industrial motor control centres.
- Mining and quarrying equipment.
- Water treatment facilities.
- Power generation installations.
- Oil and gas processing plants.
- Medium voltage switchgear.
- OEM electrical equipment.
