High-speed aR characteristic fuse designed for semiconductor protection in industrial power electronic applications, rated 500A at 1000VAC (IEC) and 1100VAC (UL) with flush striker ends and metric threads.
£171.40
The Mersen J301285 is an industrial high-speed semiconductor fuse designed to protect sensitive power electronic components against damaging short-circuit currents. Its rapid operating characteristics help interrupt severe electrical faults before excessive thermal and electrical energy can reach valuable semiconductor devices.
High-speed fuses are commonly used to protect components such as IGBTs, thyristors, rectifiers and power diodes. By restricting fault-current let-through energy, the J301285 can help reduce secondary equipment damage, improve operational reliability and minimise costly maintenance and production downtime.
The Mersen J301285 is intended for use in compatible industrial drives, converters, inverters, uninterruptible power supplies and specialist power control equipment. Its precise current rating, voltage rating, utilisation category, breaking capacity, dimensions and terminal configuration should be confirmed from the product marking or official Mersen documentation before installation.
High-speed semiconductor fuses are engineered to operate more rapidly than conventional general-purpose fuses. During a short-circuit event, they limit the thermal and electrical energy transferred to vulnerable semiconductor components, helping prevent extensive damage to power modules and associated equipment.
Correct fuse selection is essential for safe and reliable protection. The current rating, voltage rating, utilisation category, breaking capacity, physical dimensions and terminal arrangement of the Mersen J301285 must match the requirements of the protected circuit and the original equipment manufacturer.
| Item number | J301285 |
|---|---|
| Catalogue No | PC70UD10C500TF |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1000VAC IEC 1100VAC UL 500A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340339246 |
| Rated voltage AC UL | 1100 V |
| Rated voltage AC IEC | 1000 V |
| Ampere Rating | 500 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 70 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 483000 A²s |
| Melting I2t | 84000 A²s |
| AC Max I.R./Breaking Capacity | I1: 100 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 39.8 mm |
| Product Length | 74 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.017 kg |
| Sell Pack Width | 85 mm |
| Sell Pack Length | 133 mm |
| Sell Pack Height | 55 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.339 kg |
| Power Dissipation at Rated Current Value | 83 W |
| HS Code | 85361090 |
The Mersen J301285 is intended to provide high-speed short-circuit protection for semiconductor devices installed in compatible industrial power electronic equipment.
It may be used in suitable circuits containing sensitive components such as IGBTs, thyristors, rectifiers and power diodes.
A high-speed fuse interrupts severe fault currents rapidly and limits the energy reaching sensitive semiconductor components, helping reduce the risk of extensive equipment damage.
It may be used in compatible industrial drives, converters, inverters, UPS systems, power supplies and other power conversion equipment.
It should only be used as a replacement when its current rating, voltage rating, utilisation category, breaking capacity, dimensions and terminal arrangement match the original equipment requirements.
Mersen high-speed semiconductor fuses are used in industrial power electronic systems where rapid fault interruption, effective current limitation and dependable component protection are essential.
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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...