Why Choose the Mersen N300231 Protistor® High-Speed Fuse?
The Mersen N300231, catalogue number A070UD33LI700, is a premium square body high-speed semiconductor protection fuse engineered to provide exceptional protection for power electronic equipment. As part of the trusted Mersen Protistor® Size 33 series, this ultra-fast aR fuse is specifically designed to safeguard sensitive semiconductor devices including diodes, thyristors, IGBTs and power converters.
Designed for demanding industrial applications, the N300231 combines rapid fault interruption with high breaking capacity to minimise damage caused by short circuits. Its silver-plated contacts, solidified sand construction and precision-manufactured fuse elements provide dependable performance, while the integrated striker enables remote indication and enhanced maintenance capabilities.
With a 700 A current rating and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen N300231 is ideal for protecting variable speed drives, UPS systems, DC drives, renewable energy equipment and industrial power conversion systems. The long slotted blade terminals enable straightforward installation into compatible fuse bases and switchgear assemblies.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive power electronics.
- 700 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, thyristors, SCRs and semiconductor devices against short circuits.
- Integrated striker indicator for remote status indication.
- High breaking capacity with low let-through energy (I²t).
Key Features
- Mersen Protistor® Size 33 series.
- 700 A rated current.
- 690 V AC IEC / 700 V AC UL operating voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade terminals.
- Integrated striker mechanism.
- Silver-plated contact surfaces.
- Designed specifically for semiconductor protection.
Reliable Protection for Power Electronics
Semiconductor protection fuses are engineered to clear high fault currents before sensitive electronic components are damaged. Their ultra-fast response significantly reduces thermal and mechanical stress, helping maximise equipment reliability and minimise costly downtime.
The Mersen Protistor® range has become a preferred choice for industrial engineers and OEM manufacturers requiring dependable protection for modern power conversion equipment operating in demanding electrical environments.
Typical Applications
- Variable frequency drives (VFDs).
- Servo drive systems.
- Industrial power converters.
- UPS and backup power systems.
- Renewable energy inverters.
- Motor control centres.
- Battery energy storage systems.
- Semiconductor power protection.
