Mersen A100UD73LI1250 / J301193 Protistor Size 73 aR High-Speed Semiconductor Fuse, 1250 A, 900V AC
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The Mersen A100UD73LI1250 is an ultra-fast acting Protistor® square body fuse-link engineered to deliver exceptional short-circuit protection for high-power conversion equipment and heavy industrial motor drives. Operating within the aR characteristic class, this Size 73 fuse provides superior current limitation and robust thermal cycling capabilities to safely protect highly sensitive semiconductor components, including diodes, thyristors, and IGBTs. Featuring silver-plated LI slotted blade terminals, non-magnetic hardware, and an impressive 151 kA breaking capacity, it ensures rapid and highly reliable fault clearing for mission-critical enterprise UPS and inverter systems.
| Product ID (MPN) | A100UD73LI1250 |
| Order Code / Item Number | J301193 |
| Product Series | Protistor® Square Body High-Speed Fuses |
| Fuse Size | Size 73 |
| Speed / Characteristic | aR (Ultra-Fast Acting Semiconductor Protection) |
| Rated Current (In) | 1250 A |
| Rated Voltage (AC) | 900 V AC (IEC) / 1000 V AC (UL) |
| Rated Breaking Capacity | 151 kA AC |
| Terminals / Mounting Style | Type LI (Slotted Blades) |
| Pre-arcing I²t | 585 kA²s |
| Clearing I²t at Rated Voltage | 3080 kA²s |
| Power Dissipation (at In) | 234 W |
| Standards & Certifications | IEC 60269-4, VDE 636-23, UL/CSA Recognized (E76491) |
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