High-speed aR fuse with ceramic square body, rated 160A at 690VAC IEC and 700VAC UL, featuring striker indication and slotted blade terminals for bolted mounting.
£108.74
The Mersen F300385 (catalogue number A070UD31KI160) is a high-performance Protistor® square body semiconductor protection fuse engineered to provide rapid and reliable protection for sensitive power electronic devices. Designed specifically for safeguarding semiconductors such as IGBTs, thyristors, diodes and power conversion equipment, it delivers exceptional fault protection in demanding industrial applications.
As part of the trusted Mersen Protistor® Size 31 aR series, this ultra-fast acting fuse helps minimise damage caused by short circuits through its low let-through energy (I²t) characteristics and high breaking capacity. Its silver-plated contacts, robust square body construction and integrated striker provide dependable operation and simplified maintenance within industrial electrical systems.
Rated at 160 A with an operating voltage of 690 V AC (IEC) / 700 V AC (UL), the F300385 is ideally suited for protecting variable speed drives, UPS systems, soft starters, power converters and other semiconductor-based equipment requiring fast and reliable overcurrent protection.
High-speed semiconductor fuses are designed to interrupt fault currents before sensitive electronic components can be damaged. Unlike conventional industrial fuses, the Mersen Protistor® series provides exceptionally fast operation with low let-through energy, helping extend the service life of costly power electronics.
The F300385 is widely used in industrial automation, renewable energy systems and power conversion equipment where dependable protection is essential for maintaining system reliability and minimising downtime.
| Item number | F300385 |
|---|---|
| Catalogue No | A070UD31KI160 |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 160A With Striker Slotted Blades short |
| EAN/UPC Code | 3605340327632 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 160 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 31 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 7700 A²s |
| Melting I2t | 1300 A²s |
| AC Max I.R./Breaking Capacity | I1: 200 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Slotted Blades |
| Product Width | 51 mm |
| Product Length | 129 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.203 kg |
| Sell Pack Width | 157 mm |
| Sell Pack Length | 166 mm |
| Sell Pack Height | 62 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.401 kg |
| Power Dissipation at Rated Current Value | 35 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The F300385 is a high-speed semiconductor fuse designed to protect IGBTs, thyristors, diodes and other power electronic components from damaging short circuits.
This fuse has a 160 A current rating.
The fuse is rated for 690 V AC (IEC) and 700 V AC (UL).
The aR characteristic identifies an ultra-fast semiconductor protection fuse intended to protect power electronic devices against short-circuit faults.
It is commonly installed in variable speed drives, power converters, UPS systems, industrial automation equipment and other semiconductor-based electrical systems.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, machine builders and industrial engineers to provide rapid fault protection, maximise equipment uptime and safeguard valuable power electronic components.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...