Why Choose the Mersen K300044 Protistor® High-Speed Fuse?
The Mersen K300044 (PC31UD69V630EF) is a premium square body high-speed semiconductor fuse designed to provide exceptional protection for sensitive power electronic equipment. As part of the proven Mersen Protistor® Size 31 series, this ultra-fast aR fuse safeguards diodes, thyristors, IGBTs and other semiconductor devices used in demanding industrial power conversion applications.
Designed for maximum reliability, the K300044 combines rapid fault interruption with low let-through energy to minimise semiconductor damage during short circuits. Its ceramic body, silver-plated contacts and solidified sand construction deliver outstanding electrical performance, high interrupting capacity and long service life in industrial environments.
With a rated current of 630 A and a 690 V AC IEC / 700 V AC UL voltage rating, the K300044 is ideally suited for industrial drives, UPS systems, power converters, renewable energy systems and other high-power electronic installations requiring dependable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 630 A current rating for high-power industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, thyristors and power diodes.
- High breaking capacity for superior fault protection.
- Integrated striker indicator for remote monitoring.
Key Features
- Mersen Protistor® Size 31 series.
- Catalogue number PC31UD69V630EF.
- 630 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Open slot blade terminals.
- Integrated striker indication.
- Silver-plated contact surfaces.
- Ceramic body with solidified sand arc-quenching technology.
- Low I²t characteristics for semiconductor protection.
Reliable Semiconductor Protection for Industrial Power Systems
High-speed semiconductor fuses are specifically engineered to interrupt fault currents before expensive power electronic components can be damaged. Their ultra-fast operation and low let-through energy improve equipment reliability, reduce maintenance costs and minimise production downtime.
The Mersen Protistor® Size 31 range is widely specified by OEMs and industrial engineers for protecting variable speed drives, converters, UPS systems and renewable energy equipment where dependable semiconductor protection is essential.
Typical Applications
- Variable speed drives.
- Industrial power converters.
- IGBT inverter protection.
- Thyristor and diode rectifiers.
- UPS systems.
- Renewable energy inverters.
- Motor control centres.
- Industrial automation equipment.
