High-speed fuse designed for semiconductor protection with a robust ceramic square body, striker indication system, and plain blade terminals. Rated 900VAC IEC, 1000VAC UL, 1000A current rating.
£317.37
The Mersen R302718 is an industrial high-speed semiconductor protection fuse designed to protect sensitive power electronic components against damaging overcurrents and short-circuit faults. Its rapid operating characteristic helps limit the electrical and thermal energy transferred to semiconductor devices, supporting dependable operation in demanding power conversion and automation systems.
High-speed fuses are engineered to interrupt fault currents more rapidly than general-purpose industrial fuses. This makes the Mersen R302718 suitable for equipment containing power semiconductors such as diodes, thyristors, rectifiers and insulated-gate bipolar transistors, where effective fault-energy limitation is critical.
When correctly matched to the original equipment specification, the R302718 can help reduce component damage, minimise unplanned downtime and improve the reliability of variable frequency drives, industrial converters, inverters, UPS equipment and other power electronic installations.
Power semiconductor components can be damaged by excessive fault energy within a very short period. High-speed fuses such as the Mersen R302718 are designed to respond rapidly, helping limit peak fault current and reduce the total energy passed through to vulnerable electronic components.
Correct fuse coordination is essential for safe and reliable operation. Before installation, the fuse reference, current rating, voltage rating, operating class, physical dimensions and connection arrangement should be checked against the equipment documentation or original installed fuse.
| Item number | R302718 |
|---|---|
| Catalogue No | PC73UD90V10CPA |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 900VAC IEC 1000VAC UL 1000A With Striker Plain Blades |
| EAN/UPC Code | 3605340355567 |
| Rated voltage AC UL | 1000 V |
| Rated voltage AC IEC | 900 V |
| Ampere Rating | 1000 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 1920 kA²s |
| Melting I2t | 370 kA²s |
| AC Max I.R./Breaking Capacity | I1: 150 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 | 174 W |
| HS Code | 85361090 |
The Mersen R302718 is used to protect sensitive semiconductor devices and industrial power electronic equipment against damaging overcurrents and short-circuit faults.
A high-speed fuse interrupts fault current rapidly and limits the energy reaching semiconductor components, helping prevent severe thermal and electrical damage.
No. It should only be used when its electrical ratings, operating class, time-current characteristics, dimensions and terminal arrangement match the original equipment requirements.
Potential applications include variable frequency drives, industrial converters, rectifiers, inverters, UPS systems and other assemblies containing power semiconductor devices.
The fuse should be selected and installed by a suitably qualified electrical professional in accordance with the equipment documentation and applicable electrical safety requirements.
Mersen high-speed fuse technologies are widely specified for industrial power conversion and automation equipment where rapid fault interruption and reliable protection of critical semiconductor components are required.
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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...