High-speed fuse designed for semiconductor protection with 500A rating, 1250VAC IEC and 1300VAC UL voltage ratings, featuring ceramic body, striker indication system, and metric threaded flush ends for bolted mounting.
£211.31
The Mersen N300507, catalogue number PC73UD13C500TF, is a Protistor® Size 73 square body high-speed semiconductor protection fuse engineered to provide maximum protection for modern power electronic equipment. Featuring an ultra-fast aR operating characteristic, it is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit faults.
Rated at 500 A, with a 1250 V AC IEC and 1300 V AC UL voltage rating, the N300507 delivers outstanding current-limiting performance and a high interrupting capacity. The fuse incorporates die-cut silver fuse elements embedded in solidified sand, reducing let-through energy (I²t) and improving protection for valuable semiconductor components.
The fuse features flush-end metric threaded terminals, silver-plated contacts and an integrated striker indicator for remote status indication using compatible microswitch accessories. It is ideally suited for industrial drives, renewable energy systems, UPS equipment and other demanding power conversion applications.
The Protistor® Size 73 range is designed to protect today's high-power semiconductor equipment by interrupting fault currents before excessive thermal energy can damage expensive electronic components. Its advanced construction delivers excellent current limitation, low energy let-through and dependable long-term performance.
The Mersen N300507 is widely specified by OEMs, panel builders and maintenance engineers protecting high-voltage drives, renewable energy converters, UPS systems and industrial power conversion equipment.
| Item number | N300507 |
|---|---|
| Catalogue No | PC73UD13C500TF |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 500A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329506 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 500 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 360 kA²s |
| Melting I2t | 44 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 73 mm |
| Product Length | 74 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.22 kg |
| Sell Pack Width | 110 mm |
| Sell Pack Length | 125 mm |
| Sell Pack Height | 75 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.22 kg |
| Power Dissipation at Rated Current Value | 112 W |
| HS Code | 85351000 |
The Mersen N300507 is designed to protect IGBTs, thyristors, SCRs, diodes and other semiconductor devices from damaging short-circuit faults.
The Mersen N300507 has a continuous current rating of 500 A.
It is rated for 1250 V AC (IEC) and 1300 V AC (UL).
Yes. The fuse incorporates an integrated striker indicator compatible with optional remote indication microswitch accessories.
The aR characteristic identifies an ultra-fast semiconductor protection fuse designed specifically to provide short-circuit protection for sensitive semiconductor devices.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, machine builders and industrial maintenance engineers for delivering reliable, high-speed protection of critical power electronic equipment.
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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...