High-speed fuse providing rapid circuit protection for semiconductor devices with 690VAC rating and 250A current, featuring a ceramic body, DIN 110 blades, and striker indication system.
£138.23
The Mersen R302143 is an industrial high-speed semiconductor protection fuse designed to help protect sensitive power electronic components from damaging overcurrents and short-circuit faults. Manufactured by Mersen, a specialist in electrical protection technologies, this fuse is intended for applications where rapid fault interruption and dependable current limitation are essential.
High-speed fuses are engineered to operate more rapidly than conventional industrial fuses, reducing the electrical and thermal energy transferred to semiconductor devices during a fault. This makes the Mersen R302143 suitable for protecting equipment such as variable frequency drives, rectifiers, inverters, converters and industrial power supplies.
Its robust industrial construction supports reliable performance in demanding electrical installations. When correctly selected and installed in accordance with the equipment manufacturer's requirements, the R302143 can help reduce component damage, minimise unplanned downtime and improve the operational reliability of critical power electronic systems.
Semiconductor components can be damaged by fault energy within a very short period. High-speed fuses such as the Mersen R302143 are designed to interrupt excessive current rapidly, helping limit the peak current and total energy passed through to vulnerable components.
This type of fuse is commonly installed in equipment that uses diodes, thyristors, insulated-gate bipolar transistors and other power semiconductor devices. Correct fuse coordination is important, so the replacement fuse should always match the electrical ratings, dimensions and operating characteristics specified by the equipment manufacturer.
| Current | 11 A |
|---|---|
| Item number | R302143 |
| Catalogue No | PC71GB69V250D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 71 gR 690VAC IEC 250A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340351002 |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 250 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | gR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 56 kA²s |
| Melting I2t | 9.58 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 | DIN 110 Blades |
| Product Width | 51 mm |
| Product Length | 133.4 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.56 kg |
| Sell Pack Width | 142 mm |
| Sell Pack Length | 166 mm |
| Sell Pack Height | 62 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.52 kg |
| Power Dissipation at Rated Current Value | 48 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The Mersen R302143 is used to help protect 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 sensitive semiconductor components, helping reduce the likelihood of costly equipment damage.
It should only be used as a direct replacement when its voltage rating, current rating, operating class, dimensions, terminals and time-current characteristics match the original fuse specification.
Potential applications include variable frequency drives, industrial converters, rectifiers, inverters, UPS equipment and other systems 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 fuse technologies are widely specified for industrial power conversion and automation equipment where rapid fault interruption, reliable current limitation and dependable protection of critical electrical 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...