Why Choose the Mersen E300660 Protistor® High-Speed Fuse?
The Mersen E300660, catalogue number A120UD70LI350, is a premium square body high-speed semiconductor fuse engineered to provide ultra-fast protection for high-voltage power electronic equipment. Part of the renowned Mersen Protistor® Size 70 series, this fuse is specifically designed to protect IGBTs, thyristors, GTOs, diodes and other semiconductor devices against damaging short-circuit currents. Featuring long slotted blade terminals with an integrated striker indicator, it offers dependable protection for demanding industrial applications.
Manufactured using precision die-cut pure silver fuse elements embedded in solidified silica sand, together with silver-plated contact surfaces and non-magnetic hardware, the E300660 delivers exceptionally low let-through energy (I²t) and excellent current-limiting performance. This advanced construction helps minimise semiconductor damage while improving equipment reliability and reducing costly downtime.
With a 350 A current rating, 1100 V AC IEC rating and 1200 V AC UL rating, the Mersen E300660 is ideally suited for renewable energy systems, variable frequency drives, UPS installations, industrial power converters and heavy-duty automation equipment requiring dependable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 350 A current rating for high-power industrial applications.
- 1100 V AC IEC / 1200 V AC UL voltage rating.
- Protects IGBTs, thyristors, GTOs and diode modules.
- Low I²t characteristics minimise semiconductor damage.
- Long slotted blade terminals for secure bolted installation.
Key Features
- Mersen Protistor® Size 70 series.
- 350 A rated current.
- 1100 V AC IEC / 1200 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade terminals.
- Integrated striker indicator for remote fuse monitoring.
- 150 kA AC breaking capacity.
- Silver-plated contacts with non-magnetic hardware.
- RoHS compliant.
Reliable Protection for High-Voltage Power Electronics
High-speed semiconductor fuses are engineered to interrupt fault currents before sensitive power semiconductors can be damaged. The Mersen Protistor® Size 70 range delivers rapid fault interruption with low I²t values, making it ideal for protecting modern power conversion systems while improving operational reliability and reducing maintenance costs.
The E300660 is widely used in renewable energy installations, industrial motor drives, power converters, UPS systems, battery energy storage systems (BESS) and industrial automation equipment where reliable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Renewable energy inverter systems.
- Battery energy storage systems (BESS).
- Industrial power converters and rectifiers.
- UPS and standby power systems.
- Industrial automation and OEM machinery.
