Why Choose the Mersen T300512 High-Speed Fuse?
The Mersen T300512 is a premium Protistor® square body semiconductor fuse developed to provide ultra-fast protection for high-power semiconductor devices in demanding industrial applications. Designed to safeguard sensitive equipment such as IGBTs, thyristors, diodes and power converters, it rapidly interrupts fault currents before costly damage can occur.
As part of the renowned Mersen Protistor® Size 73 series, the T300512 combines high interrupting capacity with low let-through energy to maximise equipment protection and system reliability. Its robust construction features silver-plated contacts and precision-manufactured fuse elements embedded in high-grade silica sand for consistent performance throughout its service life.
Rated at 900 A with a 1200 V AC IEC / 1300 V AC UL voltage rating, the T300512 is ideally suited to high-power industrial drives, renewable energy systems, UPS installations, rectifiers and other advanced power conversion equipment. The square body design with flush metric threaded terminals and integrated striker indicator enables secure installation and convenient fuse monitoring.
Key Advantages
- Ultra-fast aR semiconductor fuse for critical power electronic protection.
- 900 A current rating for high-power industrial systems.
- 1200 V AC IEC / 1300 V AC UL voltage rating.
- Excellent current limiting characteristics with low I²t.
- Integrated striker indicator for fuse status indication.
- Designed for protecting IGBTs, SCRs, diodes and semiconductor assemblies.
Key Features
- Mersen Protistor® Size 73 series.
- 900 A rated current.
- 1200 V AC IEC / 1300 V AC UL.
- aR ultra-fast acting protection.
- Square body construction with flush metric threaded terminals.
- Silver-plated contact surfaces for dependable electrical performance.
- Integrated striker for local or remote indication.
- High breaking capacity for demanding industrial applications.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses are engineered to clear short circuits before damaging sensitive power electronic components. Their rapid operating characteristics minimise thermal and mechanical stress, helping to improve equipment uptime while reducing maintenance and replacement costs.
The Mersen Protistor® range is widely specified by OEMs and industrial engineers for protecting power conversion equipment used throughout manufacturing, renewable energy, transportation and heavy industry.
Typical Applications
- Variable frequency drives and motor control systems.
- Power converters and rectifiers.
- Renewable energy inverter systems.
- UPS and backup power installations.
- Industrial automation equipment.
- High-power semiconductor protection.
