Why Choose the Mersen H300111 Protistor® High-Speed Fuse?
The Mersen H300111 is a high-performance Protistor® square body semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic devices. Designed for demanding industrial applications, this 125 A high-speed fuse protects semiconductors including IGBTs, thyristors, diodes and MOSFETs from damaging short-circuit currents.
Part of the renowned Mersen Protistor® size 30 aR series, the H300111 offers exceptional current-limiting performance with a low let-through energy (I²t), helping to minimise damage to expensive power conversion equipment. Its square body design with DIN 80 blade terminals and integrated striker indicator simplifies installation and maintenance in industrial power systems.
Rated for 690 V AC (IEC) and 700 V AC (UL) with a 125 A current rating, the Mersen H300111 is ideally suited for protecting variable speed drives, UPS systems, soft starters, converters and other semiconductor-based equipment operating in demanding industrial environments.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 125 A current rating for industrial power applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, MOSFETs, thyristors and diodes.
- Integrated striker indicator for simplified maintenance.
- Low I²t design reduces damage during fault conditions.
Key Features
- Mersen Protistor® size 30 aR series.
- Model H300111.
- 125 A rated current.
- 690 V AC (IEC) / 700 V AC (UL).
- Square body fuse with DIN 80 blade terminals.
- Integrated striker trip indicator.
- Current-limiting, ultra-fast semiconductor protection.
- Silver-plated contact surfaces for reliable performance.
Reliable Protection for Power Electronics
Semiconductor protection fuses are specifically designed to react extremely quickly to fault currents, helping to protect sensitive electronic components before excessive thermal energy can cause permanent damage. Their low I²t performance makes them essential in high-power conversion systems.
The Mersen Protistor® H300111 is widely specified by equipment manufacturers and maintenance engineers for protecting industrial drives, converters and power electronics where reliable fault interruption and long-term operational safety are essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- UPS systems.
- Power converters and rectifiers.
- Soft starters.
- Semiconductor protection in industrial automation equipment.
