Why Choose the Mersen K300481 Protistor® High-Speed Fuse?
The Mersen K300481 (A070UD31TTI700) is a premium square body high-speed semiconductor fuse from the trusted Protistor® Size 31 series. Designed with an ultra-fast aR operating characteristic, it provides outstanding protection for sensitive semiconductor devices including IGBTs, thyristors, diodes and MOSFETs used in demanding industrial power conversion equipment.
Manufactured using Mersen's advanced Protistor® technology, the K300481 delivers rapid fault interruption with exceptionally low let-through energy, helping prevent costly damage to semiconductor components during short-circuit events. Its ceramic square body, silver-plated contacts and solidified quartz sand construction provide reliable performance, excellent thermal stability and a high interrupting capacity for demanding industrial environments.
Rated at 700 A with a 690 V AC IEC / 700 V AC UL voltage rating, this fuse features flush threaded UNC terminals and an integrated striker indicator, making it ideal for use in variable speed drives, UPS systems, industrial converters and renewable energy applications.
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 MOSFET devices.
- 200 kA breaking capacity for dependable fault interruption.
- Integrated striker indicator for remote fuse monitoring.
Key Features
- Mersen Protistor® Size 31 series.
- Catalogue number A070UD31TTI700.
- 700 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Flush threaded UNC terminals.
- Integrated striker indicator.
- Silver-plated contact surfaces.
- Ceramic body with solidified sand arc-quenching technology.
- Very low I²t for superior 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 response and low let-through energy improve equipment reliability, reduce maintenance costs and minimise production downtime in demanding industrial applications.
The Mersen Protistor® Size 31 range is widely specified by OEMs and industrial engineers for protecting variable speed drives, industrial converters, UPS systems, rectifiers 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.
