High-speed Protistor® fuse with 800A rating, ceramic square body, flush ends with UNC threads, integrated striker for remote indication, suitable for IEC 690VAC and UL 700VAC systems.
£203.28
The Mersen L300482, catalogue number A070UD31TTI800, is a Protistor® Size 31 square body high-speed semiconductor fuse designed to provide advanced protection for sensitive power electronic equipment. Its ultra-fast aR operating characteristic delivers reliable short-circuit protection for IGBTs, thyristors, diodes and other semiconductor devices used in industrial power conversion systems.
Designed for demanding industrial applications, the L300482 combines low let-through energy with a high interrupting capacity to minimise damage during fault conditions. It features flush ends with UNC threaded connections and an integrated striker indicator for optional remote fuse monitoring.
Rated at 800 A with 690 V AC (IEC) and 700 V AC (UL) voltage ratings, the Mersen L300482 is suitable for industrial drives, converters, UPS equipment, renewable energy systems and other high-performance power electronic applications.
Protistor® semiconductor fuses are engineered to interrupt high fault currents before sensitive power electronic devices are damaged. Their low energy let-through characteristics help maximise equipment availability while reducing repair costs in industrial power conversion systems.
The robust square body construction, silver-plated contacts and precision fuse elements ensure dependable long-term performance across industrial automation, renewable energy and power conversion applications.
| Item number | L300482 |
|---|---|
| Catalogue No | A070UD31TTI800 |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 800A With Striker Flush ends UNC threads |
| EAN/UPC Code | 3605340329117 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 800 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 31 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 880000 A²s |
| Melting I2t | 140000 A²s |
| AC Max I.R./Breaking Capacity | I1: 200 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 51 mm |
| Product Length | 50.6 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.155 kg |
| Sell Pack Width | 85 mm |
| Sell Pack Length | 168 mm |
| Sell Pack Height | 65 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.385 kg |
| Power Dissipation at Rated Current Value | 105 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The L300482 is a high-speed semiconductor protection fuse designed to protect IGBTs, thyristors, diodes and other sensitive power electronic devices from short-circuit faults.
The Mersen L300482 has a rated current of 800 A.
The fuse is rated for 690 V AC (IEC) and 700 V AC (UL).
The L300482 features flush ends with UNC threaded terminals for secure bolted installation.
The built-in striker provides mechanical indication when the fuse operates and can be used with a compatible microswitch for remote monitoring.
Mersen Protistor® semiconductor fuses are trusted worldwide by machine builders, electrical engineers and power electronics manufacturers to deliver rapid fault protection, dependable performance and long-term equipment reliability.
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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...