Why Choose the Mersen E300476 Protistor® High Speed Fuse?
The Mersen E300476, catalogue number A070UD31TTI400, is a premium square body high speed semiconductor fuse engineered to provide ultra-fast protection for modern power electronic equipment. Part of the trusted Mersen Protistor® Size 31 series, this fuse is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices from damaging short circuits and fault currents.
Designed for demanding industrial applications, the E300476 combines exceptional current limiting performance with low let-through energy to help minimise damage to expensive equipment and maximise system uptime. Precision die-cut fuse elements embedded in solidified sand, silver-plated contact surfaces and non-magnetic hardware provide dependable long-term protection for critical power conversion equipment.
With a 400 A current rating and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen E300476 is ideally suited for variable frequency drives, UPS systems, converters, renewable energy installations and industrial automation equipment requiring reliable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 400 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Provides dependable protection for IGBTs, thyristors and diode modules.
- Low I²t characteristics help minimise equipment damage.
- Flush end UNC threaded terminals enable secure bolted installation.
Key Features
- Mersen Protistor® Size 31 series.
- 400 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Flush end terminals with UNC threaded holes.
- Integrated striker indicator for remote fuse monitoring.
- 200 kA breaking capacity.
- Silver-plated contacts with non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
High speed semiconductor fuses are specifically engineered to interrupt fault currents before sensitive semiconductor devices can be damaged. The Mersen Protistor® range delivers exceptionally fast fault clearing with low I²t values, making it ideal for protecting modern power conversion equipment while improving equipment reliability and reducing costly downtime.
The E300476 is widely used in industrial motor drives, renewable energy systems, converters, rectifiers and automation equipment where dependable semiconductor protection is essential for continuous operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor control systems.
- Power converters and rectifiers.
- UPS and standby power systems.
- Renewable energy inverter systems.
- Industrial automation and OEM machinery.
