Why Choose the Mersen F300040 Protistor® High Speed Semiconductor Fuse?
The Mersen F300040 is a premium Protistor® square body high speed semiconductor fuse engineered to provide ultra-fast protection for sensitive power semiconductor devices in industrial power conversion equipment. Designed specifically for modern drives and power electronics, it delivers outstanding current limiting performance to minimise damage caused by short circuits and electrical faults.
As part of the Mersen Protistor® Size 31 aR series, the F300040 has been developed to protect IGBTs, SCRs, thyristors and diode modules used in demanding industrial applications. The fuse incorporates precision die-cut silver fuse elements embedded in solidified sand, providing low I²t values, high interrupting capacity and dependable long-term performance.
Rated at 400 A with a 690 V AC IEC / 700 V AC UL voltage rating, the F300040 features open slot blade terminals with an integrated striker indicator, making it an excellent choice for industrial drives, UPS systems, converters, rectifiers and renewable energy power conversion equipment.
Key Advantages
- Ultra-fast semiconductor fuse for critical power electronic protection.
- 400 A current rating for industrial applications.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR protection class for semiconductor devices.
- Low I²t characteristics minimise fault energy.
- Silver-plated contacts for dependable electrical performance.
- Integrated striker indicator for remote fuse status indication.
Key Features
- Mersen Protistor® Size 31 aR series.
- Manufacturer Part Number: F300040.
- Catalogue Number: PC31UD69V400EF.
- 400 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- Square body ceramic fuse construction.
- Open slot blade bolted terminals.
- Integrated low voltage striker indicator.
- Silver-plated contact surfaces.
Reliable Protection for Industrial Power Electronics
High speed semiconductor fuses are specifically designed to protect sensitive power electronic devices requiring extremely rapid fault interruption. The Protistor® range provides exceptional current limiting performance, reducing energy let-through and helping to protect expensive semiconductor assemblies from catastrophic damage.
The F300040 is widely specified by OEMs, panel builders and maintenance engineers for use in industrial drives, renewable energy systems and power conversion equipment where reliable semiconductor protection is essential.
Typical Applications
- Variable speed drives.
- Industrial inverters.
- Power converters.
- Rectifiers.
- UPS systems.
- Renewable energy converters.
- Industrial motor control equipment.
