Why Choose the Mersen M300667 High Speed Semiconductor Fuse?
The Mersen M300667, catalogue number A120UD71LLI500, is a premium Protistor® square body high speed semiconductor fuse engineered to provide ultra-fast protection for modern power electronic equipment. Designed specifically for semiconductor applications, it protects IGBTs, thyristors, diodes and other sensitive power devices against damaging short circuit faults in demanding industrial environments.
With a 500 A current rating, 1100 V AC IEC / 1200 V AC UL voltage rating and an aR operating class, the M300667 delivers exceptional fault interruption performance while minimising let-through energy. Its robust square body construction and high breaking capacity make it an excellent choice for industrial power conversion equipment, motor drives and renewable energy systems.
The fuse features a Size 71 square body design with long slotted blade terminals and an integrated striker indicator, allowing easy installation into compatible fuse holders and remote monitoring systems used throughout industrial electrical installations.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A rated current for demanding industrial applications.
- 1100 V AC IEC / 1200 V AC UL voltage rating.
- Protects IGBTs, thyristors, diodes and other semiconductor devices.
- Low let-through energy helps minimise equipment damage.
- Integrated striker for remote indication.
- High 150 kA breaking capacity.
Key Features
- Mersen Protistor® semiconductor fuse.
- Manufacturer part number: M300667.
- Catalogue number: A120UD71LLI500.
- 500 A rated current.
- 1100 V AC IEC / 1200 V AC UL.
- aR operating class.
- Size 71 square body construction.
- Long slotted blade terminals.
- Integrated striker indicator.
- Silver-plated contact surfaces for reliable conductivity.
Reliable Protection for Industrial Power Electronics
High speed semiconductor fuses are designed to interrupt fault currents before they can damage expensive semiconductor devices. Their ultra-fast characteristics minimise thermal stress while improving system reliability and reducing costly equipment downtime.
The Mersen M300667 is widely specified for industrial automation, power converters, renewable energy equipment and motor control systems where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS systems.
- Renewable energy inverters.
- Industrial automation equipment.
- OEM electrical control panels.
