Why Choose the Mersen K300251 Protistor® High-Speed Fuse?
The Mersen K300251 (PC33UD69V700A) is a premium square body high-speed semiconductor fuse engineered to provide exceptional protection for sensitive power electronic equipment. Part of the trusted Mersen Protistor® Size 33 series, this ultra-fast aR fuse is specifically designed to protect diodes, thyristors, IGBTs and other semiconductor devices used in demanding industrial power conversion applications.
Designed to deliver rapid fault interruption with exceptionally low let-through energy, the K300251 helps minimise damage during short-circuit conditions while reducing costly downtime. Its ceramic body, silver-plated contact surfaces and solidified sand construction provide excellent electrical performance, high interrupting capacity and dependable long-term reliability in harsh industrial environments.
With a rated current of 700 A and a 690 V AC IEC / 700 V AC UL voltage rating, the K300251 is ideally suited to variable speed drives, UPS systems, industrial converters, renewable energy systems and other high-power electronic installations where reliable semiconductor protection is essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 700 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, thyristors, diodes and other semiconductor devices.
- 200 kA breaking capacity for dependable fault protection.
- Integrated striker indicator for remote monitoring.
Key Features
- Mersen Protistor® Size 33 series.
- Catalogue number PC33UD69V700A.
- 700 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- DIN 80 blade terminals.
- Integrated striker indicator.
- Silver-plated contact surfaces.
- Ceramic body with solidified sand arc-quenching technology.
- Low I²t characteristics for optimum semiconductor protection.
Reliable Semiconductor Protection for Industrial Power Systems
High-speed semiconductor fuses are specifically engineered to interrupt fault currents before expensive power electronic devices can be damaged. Their ultra-fast operation and low let-through energy improve equipment reliability while reducing maintenance costs and unplanned downtime.
The Mersen Protistor® Size 33 range is trusted worldwide by OEMs and industrial engineers for protecting variable speed drives, industrial 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.
