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.
£178.48
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.
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.
| 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 |
It provides ultra-fast short-circuit protection for semiconductor devices including IGBTs, thyristors and diodes used in industrial power electronic equipment.
The Mersen A300840 has a rated current of 315 A.
The fuse is rated at 1250 V AC (IEC) and 1300 V AC (UL).
The striker provides mechanical indication when the fuse operates and can also actuate an optional microswitch for remote monitoring.
aR indicates an ultra-fast semiconductor protection fuse designed specifically for short-circuit protection rather than overload protection.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers for protecting critical power electronic equipment in demanding applications.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...