Mersen N078166 Limitor high voltage back-up fuse rated 7.2kV AC and 100A with integrated 20N striker for medium voltage motor protection.
£666.99
The Mersen N078166 is a premium high voltage back-up fuse engineered to provide reliable short-circuit protection for medium voltage motors and associated switchgear. Part of the trusted Mersen Limitor® aSJB/D fuse series, it is specifically designed for demanding industrial applications where dependable fault interruption and long-term reliability are essential.
Designed for motor protection, the N078166 withstands the high inrush currents associated with motor starting while delivering rapid fault clearance during short-circuit conditions. Its silver-plated conductive components, reinforced melamine fibreglass body and integrated 20 N striker mechanism provide dependable performance and seamless integration with switchgear protection systems.
With a 7.2 kV AC IEC voltage rating and a 100 A current rating, the Mersen N078166 is ideally suited for protecting medium voltage motors, substations, industrial switchgear and power distribution equipment where maximum operational safety is required.
Medium voltage back-up fuses are designed to protect motors and associated equipment from damaging short-circuit faults while tolerating the repeated peak currents generated during motor starting. Rapid interruption of fault currents helps minimise equipment damage and reduce downtime in industrial electrical installations.
Mersen Limitor® high voltage fuse-links have been trusted worldwide for decades in switchgear, substations and industrial power systems, providing dependable protection for critical electrical infrastructure.
| Manufacturer | Mersen |
|---|---|
| Series | Limitor® aSJB/D |
| Model | N078166 |
| Catalogue number | 45ASB72V100P-2 |
| Product type | High voltage back-up fuse |
| Application | Medium voltage motor protection |
| Rated voltage | 7.2 kV AC IEC |
| Rated current | 100 A |
| Frequency | 50 / 60 Hz |
| Fuse dimensions | Ø50.8 mm × 292 mm |
| Striker | 20 N |
| Power dissipation | 25 W at 0.7 In |
| Minimum breaking current | 510 A |
| Operating I²t | 105 kA²s |
| Weight | Approx. 1.6 kg |
| Compliance | IEC high voltage fuse standards |
It is a high voltage back-up fuse designed to protect medium voltage motors and associated equipment against short-circuit faults.
The fuse has a rated operating voltage of 7.2 kV AC.
The Mersen N078166 has a continuous current rating of 100 A.
Yes. It incorporates an integrated 20 N striker mechanism for switchgear operation and fault indication.
It is typically installed within medium voltage switchgear, substations, motor starters and industrial power distribution systems.
Mersen Limitor® high voltage fuse-links are trusted by utilities, OEMs and industrial engineers worldwide to provide dependable protection for medium voltage motors and electrical distribution equipment.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...