High-speed aR characteristic fuse rated at 315A, 1250VAC IEC and 1300VAC UL with integrated striker indication and DIN 110 blade terminals for semiconductor protection.
£276.84
The Mersen A300564 is a premium Protistor® square body high-speed semiconductor fuse designed to deliver exceptional protection for modern power electronic equipment. Engineered specifically for semiconductor applications, it provides ultra-fast fault interruption to safeguard diodes, thyristors, IGBTs and other sensitive power devices from damaging short-circuit currents.
As part of the renowned Mersen Protistor® Size 73 series, the A300564 combines high breaking capacity with low let-through energy to minimise equipment damage and reduce downtime. Manufactured using precision fuse elements embedded in solidified sand with silver-plated contact surfaces, it delivers consistent performance in demanding industrial environments.
Featuring a 315 A current rating and a 1250 V AC IEC / 1300 V AC UL voltage rating, the A300564 is ideally suited for protecting variable frequency drives, inverters, UPS systems, soft starters and industrial power converters. The integrated striker indicator provides fast visual indication of fuse operation and can be used with compatible microswitches for remote monitoring.
High-speed semiconductor fuses are engineered to interrupt fault currents before they can damage costly semiconductor components. Their extremely fast response and low let-through energy improve equipment reliability, minimise downtime and help extend the operational life of industrial power conversion systems.
The Mersen Protistor® Size 73 range is trusted by OEMs, system integrators and maintenance engineers for protecting variable speed drives, converters and other high-value electrical equipment operating in demanding industrial environments.
| Current | 11 A |
|---|---|
| Item number | A300564 |
| Catalogue No | PC73UD13C315D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 315A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330328 |
| 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 | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 95 kA²s |
| Melting I2t | 12 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 | DIN 110 Blades |
| Product Width | 73 mm |
| Product Length | 133.4 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 3.36 kg |
| Sell Pack Width | 150 mm |
| Sell Pack Length | 250 mm |
| Sell Pack Height | 90 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.12 kg |
| Power Dissipation at Rated Current Value | 84 W |
| HS Code | 85351000 |
The A300564 protects semiconductor devices including IGBTs, thyristors and diodes from damaging short-circuit faults in industrial power electronic equipment.
This fuse has a 315 A current rating.
The fuse is rated for 1250 V AC (IEC) and 1300 V AC (UL).
The aR operating characteristic identifies an ultra-fast semiconductor protection fuse intended specifically for short-circuit protection of power electronic devices.
The integrated striker provides visual indication of fuse operation and can activate compatible microswitches for remote monitoring.
Mersen Protistor® semiconductor fuses are relied upon worldwide by engineers and OEMs to provide dependable protection for critical power conversion equipment, industrial automation systems and high-performance electrical installations.
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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...