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MERSEN FUSE A070 URD 33 TTI 0450 A070UD33TTI450
High-speed fuse offering reliable circuit protection with rapid operation, rated voltage up to 690VAC IEC and 700VAC UL at 450A, featuring square body design, integrated striker for remote indication, and flush ends with UNC threads for secure installation.
£94.99
Why Choose the Mersen X302171 Protistor® High-Speed Fuse?
The Mersen X302171 is a robust high-speed semiconductor fuse designed to protect sensitive power electronic equipment against damaging short-circuit currents. Manufactured by Mersen, a recognised specialist in electrical protection, this fuse is intended for industrial systems where rapid fault interruption and dependable current limitation are essential.
As part of the advanced Mersen Protistor® fuse range, the X302171 helps protect semiconductor components such as power diodes, thyristors, rectifiers and insulated-gate bipolar transistors. Its fast operating performance limits the electrical and thermal energy allowed to pass during a fault, reducing the risk of costly damage to connected equipment.
The Mersen X302171 is well suited to power conversion, motor control and industrial automation equipment. Its durable construction supports reliable operation in demanding electrical installations, while its industrial connection format enables secure integration into compatible fuse holders, power distribution assemblies and control panels.
Key Advantages
- High-speed semiconductor fuse designed for power electronic protection.
- Rapid fault interruption helps minimise damage to sensitive components.
- Current-limiting performance reduces electrical and thermal stress.
- Suitable for industrial power conversion and motor control equipment.
- Robust construction supports dependable operation in demanding environments.
- Manufactured by Mersen, a specialist in advanced electrical protection.
Key Features
- Mersen Protistor® high-speed fuse range.
- Designed for semiconductor and power electronic protection.
- Fast operating characteristic for short-circuit fault protection.
- Low let-through energy helps protect valuable equipment.
- High fault-current interruption capability.
- Industrial fuse construction for reliable installation.
- Suitable for use in compatible fuse holders and assemblies.
- Designed for demanding industrial electrical systems.
Reliable Protection for Industrial Power Electronics
High-speed semiconductor fuses operate more rapidly than conventional industrial fuses, helping interrupt severe fault currents before they cause extensive damage to electronic switching components. By limiting peak current and let-through energy, the Mersen X302171 helps increase equipment reliability and reduce the risk of unplanned downtime.
This type of fuse is commonly selected by automation engineers, panel builders, maintenance professionals and original equipment manufacturers for systems containing valuable semiconductor devices. Correct fuse coordination is essential, and the selected fuse must match the voltage, current and protection requirements of the equipment.
Typical Applications
- Variable frequency drives and motor control systems.
- Industrial rectifiers and power converters.
- Inverters and uninterruptible power supplies.
- Soft starters and controlled power equipment.
- Industrial automation and process control systems.
- Power semiconductor and electronic switching assemblies.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | X302171 | |
| Catalogue No | A070UD33TTI450 | |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 450A With Striker Flush ends UNC threads | |
| EAN/UPC Code | 3605340351286 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 450 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 33 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 87 kA²s | |
| Melting I2t | 13.45 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Design Details | Standard Terminal | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Brass | |
| Connection/Terminal Type | Flush ends | |
| Product Width | 73 mm | |
| Product Length | 50.6 mm | |
| Product Height | 78.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 2.682 kg | |
| Sell Pack Width | 86 mm | |
| Sell Pack Length | 247 mm | |
| Sell Pack Height | 94 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.894 kg | |
| Power Dissipation at Rated Current Value | 84 W | |
| HS Code | 85361090 |
Frequently Asked Questions
What is the Mersen X302171 used for?
The Mersen X302171 is used to provide high-speed short-circuit protection for semiconductor components and industrial power electronic equipment.
Which components can this fuse help protect?
It is designed for systems containing power semiconductors such as diodes, thyristors, rectifiers and IGBT devices.
Why is a high-speed fuse required for semiconductor protection?
High-speed fuses interrupt fault currents rapidly and limit let-through energy, helping prevent sensitive semiconductor components from being damaged during a short circuit.
Where is the Mersen X302171 typically installed?
It is typically installed in compatible fuse holders, industrial control panels, power conversion equipment and semiconductor protection assemblies.
How should the correct replacement fuse be selected?
The replacement fuse should match the original equipment requirements, including the manufacturer reference, rated voltage, rated current, operating characteristic, dimensions and terminal configuration.
Trusted Protection for Industrial Electrical Systems
Mersen high-speed semiconductor fuses are widely specified by industrial engineers, equipment manufacturers and panel builders for rapid fault interruption and dependable protection of critical power electronic equipment.
