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MERSEN FUSE A 130 URD 71 LLI 0400 A130URD71LLI0400
Engineered for demanding industrial and power electronics applications, this Protistor® high-speed fuse delivers reliable circuit protection at 1250V AC (IEC) and 1300V AC (UL) with a robust 400A rating. The slotted long blades and integrated striker facilitate secure mounting and immediate fuse status indication.
£100.03
Why Choose the Mersen K300665 High-Speed Semiconductor Fuse?
The Mersen K300665 is a premium Protistor® square body high-speed semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic devices. Designed for demanding industrial applications, it safeguards IGBTs, thyristors, diodes, inverters and power conversion equipment against damaging short circuits whilst minimising fault energy and equipment downtime.
Part of the renowned Mersen Protistor® Size 71 aR series, the K300665 is designed for modern industrial drive systems, renewable energy installations, UPS equipment and heavy-duty automation applications. Its ceramic square body construction, silver-plated slotted blade terminals and integrated striker indicator provide dependable long-term performance in demanding electrical environments.
With a 400 A current rating, 1250 V AC IEC / 1300 V AC UL voltage rating and 126 kA breaking capacity, the K300665 delivers exceptional semiconductor protection for high-power industrial equipment.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 400 A current rating for demanding industrial power applications.
- 1250 V AC IEC / 1300 V AC UL voltage capability.
- 126 kA breaking capacity for outstanding fault protection.
- Integrated striker indicator enables rapid fault identification.
- Silver-plated slotted blade terminals ensure excellent electrical conductivity.
- Robust ceramic construction for reliable long-term service.
Key Features
- Mersen Protistor® Size 71 aR series.
- 400 A rated current.
- 1250 V AC IEC / 1300 V AC UL rated voltage.
- Ultra-fast aR operating characteristic.
- 126 kA AC breaking capacity.
- Integrated striker indication.
- Slotted blade terminals with silver-plated contacts.
- Square ceramic body construction.
- Designed for semiconductor protection.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses are specifically designed to protect expensive power electronic devices by interrupting short-circuit currents before damaging thermal energy can reach sensitive semiconductor components. Their ultra-fast operation helps improve equipment reliability whilst reducing maintenance costs and production downtime.
The Mersen Protistor® range is trusted globally by machine builders, panel manufacturers and industrial engineers for protecting variable frequency drives, UPS systems, renewable energy converters and industrial power supplies.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters and converters.
- Protection of IGBT, thyristor and diode modules.
- UPS systems.
- Renewable energy power conversion equipment.
- Industrial automation and motor control panels.
- High-power semiconductor protection circuits.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 1250 V | |
| Item number | K300665 | |
| Catalogue No | A130UD71LLI400 | |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 400A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340331844 | |
| Rated voltage AC UL | 1300 V | |
| Rated voltage AC IEC | 1250 V | |
| Ampere Rating | 400 A | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 71 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 308 kA²s | |
| Melting I2t | 38 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 126 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 | 157.4 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.62 kg | |
| Sell Pack Width | 155 mm | |
| Sell Pack Length | 165 mm | |
| Sell Pack Height | 60 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.54 kg | |
| Power Dissipation at Rated Current Value | 80 W |
Frequently Asked Questions
What is the Mersen K300665 used for?
The K300665 provides ultra-fast protection for semiconductors including IGBTs, thyristors, diodes and other sensitive power electronic devices.
What is the current rating of this fuse?
The Mersen K300665 has a 400 A rated current.
What voltage is the fuse rated for?
It is rated for 1250 V AC (IEC) and 1300 V AC (UL).
Does the K300665 include a fuse indicator?
Yes. It incorporates an integrated striker indicator to provide quick visual indication when the fuse has operated.
Where is the Mersen K300665 typically installed?
It is commonly installed in industrial drives, UPS systems, renewable energy converters, motor control equipment and semiconductor protection circuits.
Trusted for Critical Semiconductor Protection
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to deliver dependable protection for critical power electronic equipment operating in demanding industrial environments.
