Why Choose the Mersen K300228 Protistor® High-Speed Fuse?
The Mersen K300228 (A070UD33LI500) is a premium square body high-speed semiconductor fuse engineered to provide advanced protection for sensitive power electronic equipment. As part of the trusted Mersen Protistor® Size 33 series, this ultra-fast aR fuse is designed to protect diodes, thyristors, IGBTs and other semiconductor devices used in demanding industrial power conversion applications.
Manufactured using Mersen's proven Protistor® technology, the K300228 delivers rapid fault interruption with exceptionally low let-through energy, helping to minimise damage during short-circuit events. Its ceramic body, silver-plated contacts and solidified sand construction provide outstanding electrical performance, high interrupting capacity and dependable long-term reliability in harsh industrial environments.
With a rated current of 500 A and a 690 V AC IEC / 700 V AC UL voltage rating, the K300228 is ideally suited to variable speed drives, UPS systems, industrial converters, renewable energy installations and other high-power electronic systems where reliable semiconductor protection is essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 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.
- High 200 kA breaking capacity for dependable fault protection.
- Integrated striker indicator for remote monitoring.
Key Features
- Mersen Protistor® Size 33 series.
- Catalogue number A070UD33LI500.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Long slotted 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 designed to interrupt fault currents before expensive power electronic devices can be damaged. Their ultra-fast response and low let-through energy improve equipment reliability while helping reduce maintenance costs and unplanned downtime.
The Mersen Protistor® Size 33 range is widely specified 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.
