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MERSEN FUSE 12,5 URD 71 PA 0315 12,5URD71PA0315
High-speed aR characteristic fuse with ceramic square body, striker indication system, and plain blade silver-plated copper terminals, rated for 315A and up to 1300VAC.
£107.09
Why Choose the Mersen A300840 High-Speed Semiconductor Fuse?
The Mersen A300840 (Catalogue No. PC71UD13C315PA) is a Protistor® Size 71 square-body high-speed semiconductor fuse designed to provide exceptional short-circuit protection for modern power electronic equipment. Rated at 315 A with voltage ratings of 1250 V AC (IEC) and 1300 V AC (UL), it delivers reliable protection for diodes, thyristors, IGBT modules and other sensitive semiconductor devices.
Engineered with Mersen's advanced fuse technology, the A300840 features precision die-cut fuse elements embedded in solidified sand to provide extremely low let-through energy (I²t), rapid fault interruption and excellent current limitation. Silver-plated contact surfaces and non-magnetic hardware further enhance long-term reliability in demanding industrial environments.
The integrated striker mechanism enables remote indication or operation of an optional microswitch, making this fuse ideal for critical power conversion systems where rapid fault signalling is essential.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 315 A current rating.
- 1250 V AC IEC / 1300 V AC UL voltage ratings.
- Integrated striker for remote indication or microswitch operation.
- Very low let-through energy (I²t) protects expensive semiconductor devices.
- Silver-plated contacts for excellent conductivity and corrosion resistance.
- High interrupting capacity for demanding industrial applications.
Key Features
- Mersen Protistor® Size 71 semiconductor fuse.
- Catalogue number PC71UD13C315PA.
- Square-body construction.
- aR ultra-fast operating characteristic.
- 315 A rated current.
- 1250 V AC IEC / 1300 V AC UL.
- Plain blade terminals.
- Integrated striker indicator.
- Solidified sand arc-quenching technology.
- Designed for semiconductor short-circuit protection.
Designed for Modern Power Conversion Systems
The Mersen A300840 has been specifically developed for demanding power electronics where conventional fuses cannot provide sufficiently fast protection. Its extremely low I²t characteristic significantly reduces thermal stress on semiconductor components, helping to extend equipment life while minimising downtime following fault conditions.
The integrated striker provides convenient remote indication or can operate an optional field-mounted microswitch, making maintenance and system monitoring more efficient in industrial installations.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters.
- Power converters.
- Rectifier systems.
- UPS equipment.
- Motor drives.
- Renewable energy converters.
- Industrial automation systems.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 1250 V | |
| Item number | A300840 | |
| Catalogue No | PC71UD13C315PA | |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 315A With Striker Plain Blades | |
| EAN/UPC Code | 3605340334333 | |
| Rated voltage AC UL | 1300 V | |
| Rated voltage AC IEC | 1250 V | |
| Ampere Rating | 315 A | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 71 | |
| Mounting | Clip | |
| Clearing I2t At Rated Voltage | 129 kA²s | |
| Melting I2t | 16 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 | Plain Blades | |
| Product Width | 51 mm | |
| Product Length | 149.4 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.68 kg | |
| Sell Pack Width | 140 mm | |
| Sell Pack Length | 170 mm | |
| Sell Pack Height | 70 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.56 kg | |
| Power Dissipation at Rated Current Value | 76 W | |
| HS Code | 85351000 |
Frequently Asked Questions
What is the Mersen A300840 used for?
It provides ultra-fast short-circuit protection for semiconductor devices including IGBTs, thyristors and diodes used in industrial power electronic equipment.
What is the rated current of the A300840?
The Mersen A300840 has a rated current of 315 A.
What voltage is the A300840 rated for?
The fuse is rated at 1250 V AC (IEC) and 1300 V AC (UL).
What does the integrated striker do?
The striker provides mechanical indication when the fuse operates and can also actuate an optional microswitch for remote monitoring.
What does the aR classification mean?
aR indicates an ultra-fast semiconductor protection fuse designed specifically for short-circuit protection rather than overload protection.
Trusted by Power Electronics Professionals
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers for protecting critical power electronic equipment in demanding applications.
