Why Choose the Mersen X301021 Protistor® High-Speed Fuse?
The Mersen X301021 is a premium square body semiconductor protection fuse engineered to provide ultra-fast protection for sensitive power semiconductor devices including IGBTs, thyristors, GTOs and diodes. As part of the Mersen Protistor® Size 70 aR series, it delivers exceptional protection for high-voltage power conversion equipment operating in demanding industrial environments.
Manufactured using pure silver die-cut fuse elements embedded in solidified sand, the X301021 offers low energy let-through characteristics, excellent arc control and reliable interruption of high fault currents. Silver-plated contact surfaces, non-magnetic hardware, flush-end UNC threaded terminals and an integrated striker indicator ensure dependable operation and simplified maintenance.
With a 250 A current rating and a 1250 V AC IEC / 1300 V AC UL voltage rating, the Mersen X301021 is ideally suited for protecting industrial drives, converters, UPS systems, renewable energy equipment and other high-power electronic applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 250 A current rating for demanding industrial applications.
- 1250 V AC IEC / 1300 V AC UL voltage capability.
- 150 kA breaking capacity for dependable fault protection.
- Integrated striker indicator for simplified maintenance.
- Silver-plated flush-end UNC threaded terminals ensure secure electrical connections.
Key Features
- Mersen Protistor® Size 70 series.
- 250 A rated current.
- 1250 V AC IEC / 1300 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Integrated striker indication system.
- Flush-end UNC threaded terminals.
- Square body bolted construction.
- Designed specifically for semiconductor protection.
Reliable Semiconductor Protection
High-speed semiconductor fuses are specifically designed to interrupt fault currents before expensive semiconductor devices can be damaged. Their ultra-fast response reduces thermal stress while maintaining the performance and reliability of industrial power conversion equipment.
The Mersen Protistor® range is trusted worldwide across industrial automation, renewable energy, transportation and manufacturing industries, providing dependable protection for drives, converters, rectifiers and UPS systems.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS systems.
- Renewable energy inverters.
- Industrial automation and power electronic equipment.
