Mersen A130UD73LI400 / A130UD73LI350 Protistor Size 73 aR High-Speed Semiconductor Fuse, 400A / 350A, 1250V AC
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The Mersen A130UD73LI400 and A130UD73LI350 are ultra-fast acting Protistor® square body fuse-links engineered to provide state-of-the-art protection for power conversion equipment, including industrial motor drives, UPS systems, and semiconductor devices (diodes, thyristors, and IGBTs). Designed in a robust Size 73 form factor with LI slotted blades, these aR-class fuses deliver exceptional current-limiting performance and superior thermal cycling capability. Rated at 1250 VAC (IEC) / 1300 VAC (UL) with a formidable 126 kA breaking capacity, they feature silver-plated contact surfaces and precision die-cut elements embedded in solidified sand to ensure reliable, low-I²t arc clearing during critical short-circuit events.
| Product ID (MPN) | A130UD73LI400 (400A) / A130UD73LI350 (350A) |
| Order Code / Item Number | D300682 (400A) / C300681 (350A) |
| Product Series | Protistor® Square Body High-Speed Fuses |
| Fuse Size | Size 73 |
| Speed / Characteristic | aR (Ultra-Fast Acting Semiconductor Protection) |
| Rated Current (In) | 400 A / 350 A |
| Rated Voltage (AC) | 1250 V AC (IEC) / 1300 V AC (UL) |
| Rated Breaking Capacity | 126 kA AC |
| Terminals / Mounting Style | Type LI (Slotted Blades) |
| Pre-arcing I²t | 25 kA²s (400A) / 17 kA²s (350A) |
| Clearing I²t at Rated Voltage | 205 kA²s (400A) / 140 kA²s (350A) |
| Power Dissipation (at In) | 93 W (400A) / 86 W (350A) |
| Standards & Certifications | IEC 60269-4, VDE 636-23, UL/CSA Recognized (E76491) |
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