High-speed Protistor® fuse engineered for superior protection of power semiconductor devices, rated for 1200VAC (IEC) and 1300VAC (UL), 900A with striker indication and flush ends.
£276.57
The Mersen T300512 is a premium Protistor® square body semiconductor fuse developed to provide ultra-fast protection for high-power semiconductor devices in demanding industrial applications. Designed to safeguard sensitive equipment such as IGBTs, thyristors, diodes and power converters, it rapidly interrupts fault currents before costly damage can occur.
As part of the renowned Mersen Protistor® Size 73 series, the T300512 combines high interrupting capacity with low let-through energy to maximise equipment protection and system reliability. Its robust construction features silver-plated contacts and precision-manufactured fuse elements embedded in high-grade silica sand for consistent performance throughout its service life.
Rated at 900 A with a 1200 V AC IEC / 1300 V AC UL voltage rating, the T300512 is ideally suited to high-power industrial drives, renewable energy systems, UPS installations, rectifiers and other advanced power conversion equipment. The square body design with flush metric threaded terminals and integrated striker indicator enables secure installation and convenient fuse monitoring.
High-speed semiconductor fuses are engineered to clear short circuits before damaging sensitive power electronic components. Their rapid operating characteristics minimise thermal and mechanical stress, helping to improve equipment uptime while reducing maintenance and replacement costs.
The Mersen Protistor® range is widely specified by OEMs and industrial engineers for protecting power conversion equipment used throughout manufacturing, renewable energy, transportation and heavy industry.
| Item number | T300512 |
|---|---|
| Catalogue No | PC73UD12C900TF |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1200VAC IEC 1300VAC UL 900A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329605 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1200 V |
| Ampere Rating | 900 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 1870 kA²s |
| Melting I2t | 250 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 | 151 W |
| HS Code | 85351000 |
The T300512 provides ultra-fast protection for semiconductor devices including IGBTs, thyristors, diodes and power conversion equipment.
The Mersen T300512 has a 900 A current rating.
It is rated at 1200 V AC according to IEC standards and 1300 V AC according to UL standards.
Yes. The fuse features an integrated striker indicator for convenient fuse condition monitoring.
It is commonly used in industrial drives, power converters, UPS systems, renewable energy equipment and other installations requiring reliable semiconductor protection.
Mersen Protistor® semiconductor fuses are trusted globally by OEMs and industrial engineers to provide dependable protection for high-value power electronic equipment in demanding operating environments.
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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...