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MERSEN FUSE A 070 URD 32 LI 0315 A070UD32LI315
High-speed Protistor® fuse providing rapid and reliable protection for sensitive power electronics with integrated striker indication and robust slotted blades.
£78.61
Why Choose the Mersen R302166 High-Speed Fuse?
The Mersen R302166 is an industrial high-speed semiconductor protection fuse designed to protect sensitive power electronic components against damaging overcurrents and short-circuit faults. Its rapid operating characteristic helps limit the electrical and thermal energy transferred to semiconductor devices, supporting reliable operation in demanding power conversion systems.
Unlike general-purpose industrial fuses, high-speed fuses are engineered to interrupt fault currents within the short timescales required by power semiconductors. The Mersen R302166 is therefore suited to equipment containing components such as diodes, thyristors, rectifiers and insulated-gate bipolar transistors, where effective fault-energy limitation is essential.
When correctly selected to match the original equipment specifications, the R302166 can help reduce component damage, minimise unplanned downtime and improve the service reliability of variable frequency drives, industrial converters, UPS equipment and other critical power electronic installations.
Key Advantages
- High-speed semiconductor protection fuse for industrial power electronics.
- Rapid fault interruption helps protect sensitive semiconductor components.
- Current-limiting performance reduces damaging let-through energy.
- Suitable for demanding power conversion and motor control equipment.
- Helps minimise equipment damage and unplanned production downtime.
- Manufactured by Mersen, a specialist in electrical protection technology.
Key Features
- Mersen industrial fuse technology.
- Manufacturer reference: R302166.
- High-speed operating characteristic.
- Designed for semiconductor and power electronics protection.
- Fast response to severe overcurrent and short-circuit conditions.
- Low let-through energy supports effective component protection.
- Industrial-grade construction for dependable operation.
- Suitable for installation in compatible fuse systems and equipment.
Reliable Protection for Industrial Power Electronics
Power semiconductor components can be damaged by excessive fault energy before a conventional fuse has time to operate. High-speed fuses such as the Mersen R302166 are engineered to respond rapidly, limiting peak fault current and reducing the total energy passed through to vulnerable electronic components.
Correct fuse coordination remains essential. Before installation, the fuse reference, voltage rating, current rating, operating class, physical dimensions and connection format should be checked against the equipment documentation or the original installed component.
Typical Applications
- Variable frequency drives and motor control systems.
- Industrial rectifiers and power converters.
- Uninterruptible power supply systems.
- Renewable energy inverters.
- Battery charging and energy storage equipment.
- Industrial automation and power electronic assemblies.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | R302166 | |
| Catalogue No | A070UD32LI315 | |
| Description | Square Body High-Speed Fuse Protistor® Size 32 aR 690VAC IEC 700VAC UL 315A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340351231 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 315 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 32 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 31.8 kA²s | |
| Melting I2t | 5.2 kA²s | |
| 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 | 59 mm | |
| Product Length | 153 mm | |
| Product Height | 65 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.7199 kg | |
| Sell Pack Width | 160 mm | |
| Sell Pack Length | 195 mm | |
| Sell Pack Height | 72 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.5733 kg | |
| Power Dissipation at Rated Current Value | 71 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen R302166 used for?
The Mersen R302166 is used to protect sensitive semiconductor devices and industrial power electronic equipment against damaging overcurrents and short-circuit faults.
Why is a high-speed fuse needed for power electronics?
A high-speed fuse interrupts fault current rapidly and limits the energy reaching semiconductor components, helping prevent severe thermal and electrical damage.
Can the R302166 replace any semiconductor fuse?
No. It should only be used when its electrical ratings, fuse class, operating characteristics, dimensions and terminal arrangement match the original equipment requirements.
What equipment may use the Mersen R302166?
Typical equipment may include variable frequency drives, rectifiers, inverters, industrial converters, UPS systems and other assemblies containing power semiconductor devices.
Who should install this fuse?
The fuse should be selected and installed by a suitably qualified electrical professional in accordance with the equipment documentation and applicable electrical safety requirements.
Trusted Electrical Protection for Industrial Systems
Mersen high-speed fuse technologies are widely specified for industrial power conversion and automation equipment where rapid fault interruption and reliable protection of critical semiconductor components are required.
