High-speed fuse with rapid response for semiconductor protection, featuring a ceramic square body, striker indication, and plain blade terminals. Rated for 450A at 1250VAC IEC and 1300VAC UL.
£247.85
The Mersen X302976 is an industrial high-speed semiconductor fuse designed to protect sensitive power electronic components against damaging short-circuit currents. Developed for demanding electrical applications, it helps safeguard semiconductor devices by interrupting severe faults rapidly and limiting the thermal and electrical energy passed to connected equipment.
Mersen high-speed fuses are commonly used in systems containing power diodes, thyristors, rectifiers, IGBT modules and other semiconductor switching devices. Their fast operating characteristics make them suitable for applications where conventional industrial fuses may not respond quickly enough to protect valuable electronic components.
The X302976 is suitable for maintenance, repair and replacement applications in compatible industrial equipment. Before installation, its electrical ratings, dimensions, terminal arrangement and operating class should be checked against the original fuse, equipment documentation or Mersen technical data to confirm correct compatibility.
Power semiconductor devices can be damaged within a very short period when exposed to excessive fault current. High-speed fuses such as the Mersen X302976 are engineered to respond rapidly, limiting peak current and reducing the amount of damaging energy that reaches the protected components.
Correct fuse selection is essential for reliable protection. The replacement fuse should match the original component’s rated current, voltage, breaking capacity, operating class, dimensions and terminal configuration. Substituting a fuse based only on its physical appearance may result in inadequate protection or unsafe operation.
| Item number | X302976 |
|---|---|
| Catalogue No | PC73UD13C450PA |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 450A With Striker Plain Blades |
| EAN/UPC Code | 3605340379860 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 450 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 290 kA²s |
| Melting I2t | 35.5 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Plain Blades |
| Product Width | 73 mm |
| Product Length | 149.4 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 3.48 kg |
| Sell Pack Width | 160 mm |
| Sell Pack Length | 245 mm |
| Sell Pack Height | 100 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.16 kg |
| Power Dissipation at Rated Current Value | 100 W |
| HS Code | 85351000 |
The Mersen X302976 is used to provide high-speed short-circuit protection for semiconductor components and industrial power electronic equipment.
It is intended for equipment containing sensitive power semiconductors such as diodes, thyristors, rectifiers and IGBT modules.
A high-speed fuse interrupts fault currents rapidly and limits let-through energy, helping prevent costly semiconductor components from being damaged during a short circuit.
No. A replacement must match the original fuse’s electrical ratings, operating characteristic, breaking capacity, dimensions and terminal arrangement. Physical similarity alone does not confirm compatibility.
It is typically installed in compatible industrial fuse holders, control panels, power conversion equipment, motor drives and semiconductor protection assemblies.
Mersen high-speed semiconductor fuses are widely specified by equipment manufacturers, panel builders and industrial engineers for rapid fault interruption and dependable protection of critical power electronic systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...