Mersen M078165 Limitor aSJB/D high voltage motor back-up fuse rated at 7.2 kV AC and 80 A with 50 kA breaking capacity and 20 N striker.
£662.91
The Mersen M078165 is a premium Limitor® aSJB/D high voltage back-up fuse-link designed specifically to protect medium voltage motors against damaging short-circuit currents. Engineered for motor protection applications, it is capable of withstanding the repeated peak currents generated during motor starting whilst providing rapid interruption when severe electrical faults occur.
Manufactured under catalogue number 45ASB72V80P-2, the M078165 features pure silver fuse elements, silver-plated brass end caps and a durable melamine fibreglass body. Its robust construction delivers dependable performance in industrial switchgear, motor control centres and medium voltage electrical systems.
With a rated voltage of 7.2 kV AC, a rated current of 80 A and compact dimensions of 50.8 mm diameter × 292 mm length, the Mersen M078165 provides reliable protection for appropriately rated high voltage motors. The integrated 20 N striker supports operation with compatible switchgear mechanisms for effective fault indication and isolation.
The Mersen M078165 has been developed specifically for medium voltage motor circuits where repeated starting currents are expected. Unlike conventional fuse-links, its characteristics allow normal motor starting whilst still providing rapid interruption during severe short-circuit conditions.
Its current-limiting design helps reduce the thermal and mechanical stress imposed on motors, cables and switchgear, improving equipment protection and supporting long-term system reliability in industrial installations.
| Manufacturer | Mersen |
|---|---|
| Series | Limitor® aSJB/D |
| Model | M078165 |
| Catalogue number | 45ASB72V80P-2 |
| Product type | High voltage motor back-up fuse-link |
| Application | Medium voltage motor protection |
| Rated voltage | 7.2 kV AC |
| Rated current | 80 A |
| Breaking capacity | 50 kA |
| Minimum breaking current | 380 A |
| Total clearing I²t | 60 kA²s |
| Power dissipation | 20 W @ 0.7 In |
| K factor | 0.51 |
| Fuse diameter | 50.8 mm |
| Fuse length | 292 mm |
| Mounting | Clip mounting |
| Striker | 20 N |
| Body material | Melamine fibreglass |
| Contact material | Silver-plated brass |
| Standards | IEC 60282-1 and IEC 60644 |
| EAN | 3605340028249 |
| RoHS compliant | Yes |
The Mersen M078165 is a high voltage back-up fuse-link designed to protect medium voltage motors against damaging short-circuit currents.
The fuse is rated for 7.2 kV AC and 80 A.
Yes. The Limitor® aSJB/D range is specifically engineered to tolerate repeated motor starting currents whilst maintaining effective short-circuit protection.
Yes. It incorporates a 20 N striker for operation with compatible switchgear and signalling mechanisms.
The fuse has a nominal diameter of 50.8 mm and an overall length of 292 mm.
Mersen Limitor® motor fuse-links are trusted worldwide by switchgear manufacturers, industrial operators and electrical engineers to protect medium voltage motors whilst accommodating demanding motor starting conditions.
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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...