Why Choose the Mersen D300452 Protistor® High-Speed Semiconductor Fuse?
The Mersen D300452 is a genuine Protistor® Size 33 square body high-speed semiconductor fuse engineered to provide ultra-fast protection for modern power electronic equipment. Manufactured as an aR class semiconductor fuse, it is specifically designed to protect diodes, thyristors, IGBTs and other sensitive semiconductor devices operating on 690 V AC (IEC) and 700 V AC (UL) systems. The fuse carries a 1100 A current rating and incorporates a striker indicator with flush-end UNC threaded terminals.
Manufactured by Mersen, Catalogue Number A070UD33TTI1100, the D300452 is part of the globally recognised Protistor® range. It features silver-plated contact surfaces, non-magnetic hardware and precision-manufactured fuse elements embedded in solidified silica sand, providing excellent current limitation, low let-through energy and dependable semiconductor protection.
With a 200 kA AC breaking capacity, robust square body construction and threaded flush-end connections, the D300452 is ideally suited for protecting industrial drives, UPS systems, converters, inverters and other high-power electronic equipment where rapid fault clearance is critical.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 1100 A current rating.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Integrated striker indicator for fast fault indication.
- Flush-end UNC threaded terminals for secure bolted installation.
- 200 kA interrupting capacity.
Key Features
- Mersen Protistor® Size 33 semiconductor fuse.
- Catalogue number: A070UD33TTI1100.
- 1100 A rated current.
- 690 V AC IEC / 700 V AC UL.
- aR operating class.
- Integrated striker indication.
- Flush-end UNC threaded terminals.
- Square body bolted mounting.
Engineered for Critical Power Electronics
Protistor® semiconductor fuses are designed to minimise fault energy during overloads and short circuits, helping protect expensive semiconductor devices while reducing equipment downtime. Their ultra-fast operating characteristics provide reliable protection for today's industrial power conversion systems.
The Mersen D300452 combines high interrupting capacity, low I²t performance and rugged construction to deliver dependable protection in demanding industrial applications including drives, UPS equipment, converters and renewable energy systems.
Typical Applications
- Variable speed drives.
- Industrial power converters.
- UPS systems.
- Renewable energy inverters.
- Motor control centres.
- Semiconductor protection circuits.
