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MERSEN FUSE A 050 URD 32 TTI 1800 A050URD32TTI1800
High-speed aR characteristic fuse designed for semiconductor protection with rated voltages of 450VAC IEC and 500VAC UL, 1800A rating, flush-end striker and UNC threaded terminals for bolted mounting.
£226.63
Why Choose the Mersen R301085 High-Speed Semiconductor Fuse?
The Mersen R301085, catalogue reference A050UD32TTI1800, is a genuine Protistor® Size 32 high-speed semiconductor fuse designed to protect modern power conversion equipment against damaging short-circuit currents. Rated at 1800A, it is intended for applications operating up to 450VAC (IEC) and 500VAC (UL).
Its ultra-fast aR operating characteristic provides reliable protection for sensitive semiconductor devices including diodes, thyristors and IGBT modules. Die-cut fuse elements embedded in solidified silica sand deliver low let-through energy (I²t), excellent current limiting and high interrupting performance during fault conditions.
The fuse features flush ends with UNC threaded terminals, silver-plated contact surfaces, a robust square ceramic body and an integrated striker capable of operating an optional microswitch for remote indication. These features make it suitable for demanding industrial power electronic applications.
Key Benefits
- Ultra-fast aR protection for semiconductor devices.
- 1800A current rating for high-power industrial equipment.
- Rated up to 450VAC IEC and 500VAC UL.
- Integrated striker provides blown-fuse indication.
- Flush-end UNC threaded terminals provide secure mounting.
- Low I²t helps minimise semiconductor damage.
- Silver-plated contacts improve electrical performance.
- Designed for demanding industrial power conversion systems.
Key Features
- Mersen Protistor® Size 32 semiconductor fuse.
- Manufacturer part number: R301085.
- Catalogue number: A050UD32TTI1800.
- Square-body high-speed fuse.
- aR ultra-fast characteristic.
- 1800A rated current.
- 450VAC IEC rating.
- 500VAC UL rating.
- Flush ends with UNC threaded terminals.
- Integrated striker indicator.
- Silver-plated contact surfaces.
- Non-magnetic mounting hardware.
- RoHS compliant.
Typical Applications
- Variable speed drives.
- Industrial power converters.
- Rectifiers.
- Inverters.
- UPS systems.
- Renewable energy converters.
- Battery energy storage systems.
- Industrial welding equipment.
- Protection of IGBT modules.
- Protection of thyristors and power diodes.
Engineered for Semiconductor Protection
Protistor® semiconductor fuses are specifically designed to protect expensive power electronic devices against destructive short-circuit currents. Their advanced construction provides rapid fault interruption, low arc energy and high interrupting capability while helping to maximise equipment reliability.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 450 V | |
| Item number | R301085 | |
| Catalogue No | A050UD32TTI1800 | |
| Description | Square Body High-Speed Fuse Protistor® Size 32 aR 450VAC IEC 500VAC UL 1800A With Striker Flush ends UNC threads | |
| EAN/UPC Code | 3605340336627 | |
| Rated voltage AC UL | 500 V | |
| Rated voltage AC IEC | 450 V | |
| Ampere Rating | 1800 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 32 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 3700 kA²s | |
| Melting I2t | 1050 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Design Details | Reinforced Terminal | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Brass | |
| Connection/Terminal Type | Flush ends | |
| Product Width | 59 mm | |
| Product Length | 50.6 mm | |
| Product Height | 65 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.8099 kg | |
| Sell Pack Width | 145 mm | |
| Sell Pack Length | 245 mm | |
| Sell Pack Height | 90 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.6033 kg | |
| Power Dissipation at Rated Current Value | 195 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen R301085?
The Mersen R301085 is a Protistor® Size 32 high-speed semiconductor fuse with catalogue number A050UD32TTI1800 rated at 1800A.
What voltage is the R301085 rated for?
It is rated for 450VAC under IEC standards and 500VAC under UL standards.
What does an aR fuse protect?
An aR fuse provides ultra-fast short-circuit protection for semiconductor devices such as IGBTs, thyristors and power diodes. Separate overload protection should be provided where required.
Does the fuse include an indicator?
Yes. The fuse includes an integrated striker that can provide local indication or operate a compatible microswitch for remote signalling.
Where is the R301085 commonly used?
Typical applications include industrial drives, power converters, inverters, rectifiers, UPS systems and renewable energy equipment.
Trusted Semiconductor Protection
Mersen Protistor® semiconductor fuses are trusted worldwide to provide dependable protection for high-value power electronic equipment in demanding industrial environments.
