Why Choose the Mersen H093709 High-Voltage Motor Protection Fuse?
The Mersen H093709, catalogue number 45ASB72V200P-2, is a high-voltage DIN back-up fuse-link specifically developed for protecting medium-voltage motors against damaging short-circuit currents. As part of the Mersen Limitor® aSJB/D series, it is engineered to withstand the repeated inrush currents associated with motor starting while providing dependable current-limiting fault protection.
Rated at 7.2 kV AC and 200 A, the H093709 rapidly interrupts severe fault currents, helping to minimise thermal and mechanical stress on motors, cables, switchgear and associated equipment. Its robust construction delivers reliable performance in demanding industrial and utility environments.
The fuse features a durable melamine fibreglass body, silver-plated fuse elements and silver-plated brass end caps. An integrated 20 N striker allows compatible switchgear to trip automatically or provide fuse operation indication. The DIN-format fuse measures approximately 88 mm in diameter and 292 mm in length.
Key Advantages
- Designed specifically for medium-voltage motor protection.
- 7.2 kV AC rated voltage for industrial power systems.
- 200 A rated current.
- Current-limiting operation reduces fault energy.
- Designed to withstand repeated motor starting currents.
- 20 N striker for switchgear tripping or fuse indication.
- Premium silver-plated components and fibreglass construction.
- Suitable for medium-voltage motor starters and switchgear.
Key Features
- Mersen Limitor® aSJB/D motor protection fuse.
- 7.2 kV AC IEC rated voltage.
- 200 A rated current.
- 88 mm fuse diameter.
- 292 mm overall length.
- 20 N striker mechanism.
- Designed for repeated motor starting duty.
- Silver-plated fuse elements.
- Silver-plated brass end caps.
- Melamine fibreglass insulating body.
- RoHS compliant.
Reliable Protection for Medium-Voltage Motors
The Mersen H093709 is specifically designed for high-voltage motor circuits where frequent starting currents occur. Unlike standard transformer fuses, the Limitor® aSJB/D range is engineered to tolerate repeated motor inrush currents while rapidly clearing damaging short-circuit faults, helping maximise motor reliability and minimise downtime.
Its current-limiting characteristics reduce fault energy reaching the protected equipment, while the integrated striker enables compatible switching devices to disconnect the circuit safely following fuse operation.
Typical Applications
- Medium-voltage motor starters.
- Industrial motor protection.
- Mining and heavy industry.
- Water and wastewater pumping stations.
- Process manufacturing plants.
- High-voltage switchgear.
- Utility and infrastructure installations.
