Mersen A110UD73LI900 / L300689 High-Speed Semiconductor Fuse, 900A, 1100V UL
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The Mersen A110UD73LI900, also identified by legacy description A110URD73LI0900 and manufacturer item number L300689, is a Protistor Size 73 aR ultra-fast-acting semiconductor protection fuse rated at 900A. It features a square-body design with long slotted blade terminals and a striker indicator. The fuse is rated at 1000V AC according to IEC and 1100V AC according to UL, with an AC breaking capacity of 167kA. Designed for high-speed semiconductor protection, it provides current-limiting performance for power conversion equipment.
| Manufacturer | Mersen (Ferraz Shawmut) |
| Catalogue No | A110UD73LI900 |
| Item number | L300689 |
| Legacy Description | A110URD73LI0900 |
| Product Series | Protistor Size 73 aR |
| Fuse Type | Square-Body High-Speed Semiconductor Fuse |
| Operating Characteristic | aR, Ultra-Fast Acting |
| Rated Current | 900 A |
| Rated Voltage AC (IEC) | 1000 V AC |
| Rated Voltage AC (UL) | 1100 V AC |
| Rated Breaking Capacity AC | 167 kA |
| Pre-Arcing I²t | 250 kA²s |
| Clearing I²t at Rated Voltage | 1440 kA²s |
| Power Dissipation at Rated Current | 170 W |
| Fuse Size | 73 |
| Terminal Configuration | Type LI, Long Slotted Blades |
| Indication System | Striker; Supports Optional Field-Mountable Microswitch |
| Product Weight | 1.25 kg |
| Applicable Standard | IEC 60269-4 |
| EAN/UPC Code | 3605340576382 |
Typical Applications: The Mersen A110UD73LI900 is designed for semiconductor protection in power conversion equipment, including inverters, motor drives, and UPS systems. Its aR ultra-fast characteristic and low I²t values help limit fault energy affecting semiconductor devices such as diodes, thyristors, and IGBTs. Application suitability must be verified against the equipment voltage, protection coordination, and fuse operating characteristics.
B2B Sourcing & Replacement Support: Apexon Supply provides industrial sourcing and replacement procurement support for the Mersen A110UD73LI900 / A110URD73LI0900 high-speed fuse. Buyers should confirm the exact catalogue number, electrical ratings, aR protection characteristic, Size 73 housing, LI slotted blade configuration, and striker requirements before ordering. An aR semiconductor fuse must not be assumed to provide full-range overload protection.
Request a Quote: Contact Apexon Supply with Catalogue No A110UD73LI900, Item number L300689, required quantity, and application requirements for B2B quotation, technical alignment, or replacement sourcing support.
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