The PC73UD10C900EF high-speed fuse is engineered for precise circuit protection in demanding industrial and power electronics applications. Certified to IEC and UL standards, it offers up to 1000VAC (IEC) and 1100VAC (UL) and a 900A current rating, delivering superior safety and rapid fault interruption.
£308.20
The Mersen E300637, catalogue number PC73UD10C900EF, is a premium square body high-speed semiconductor fuse engineered to provide ultra-fast protection for modern high-voltage power electronic equipment. As part of the trusted Mersen Protistor® Size 73 series, this fuse is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices against damaging short circuits and fault currents. Featuring open slot blade terminals and an integrated striker indicator, it delivers exceptional performance in demanding industrial applications.
Designed for maximum flexibility in power conversion systems, the E300637 incorporates precision die-cut fuse elements embedded in solidified silica sand, together with silver-plated contact surfaces and non-magnetic hardware. This advanced construction provides exceptionally low let-through energy (I²t), excellent current limiting performance and reliable long-term protection for valuable semiconductor devices.
With a 900 A current rating, 1000 V AC IEC rating and 1100 V AC UL rating, the Mersen E300637 is ideally suited for renewable energy systems, industrial motor drives, high-power converters, UPS installations and heavy-duty automation equipment requiring dependable semiconductor protection.
High-speed semiconductor fuses are engineered to interrupt fault currents before sensitive semiconductor devices can be damaged. The Mersen Protistor® Size 73 range delivers exceptionally fast fault clearing with low I²t values, making it ideal for protecting modern high-voltage power conversion equipment while improving reliability and reducing costly downtime.
The E300637 is widely used in renewable energy systems, industrial drives, high-power converters, UPS systems and heavy industrial automation equipment where dependable semiconductor protection is essential for safe, continuous operation.
| Item number | E300637 |
|---|---|
| Catalogue No | PC73UD10C900EF |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1000VAC IEC 1100VAC UL 900A With Striker Open Slot Blades |
| EAN/UPC Code | 3605340331417 |
| Rated voltage AC UL | 1100 V |
| Rated voltage AC IEC | 1000 V |
| Ampere Rating | 900 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 1440 kA²s |
| Melting I2t | 250 kA²s |
| AC Max I.R./Breaking Capacity | I1: 167 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Open Slot Blades |
| Product Width | 73 mm |
| Product Length | 149.4 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.11 kg |
| Sell Pack Width | 110 mm |
| Sell Pack Length | 180 mm |
| Sell Pack Height | 80 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.11 kg |
| Power Dissipation at Rated Current Value | 170 W |
| HS Code | 85361090 |
The E300637 provides ultra-fast protection for semiconductor devices including IGBTs, thyristors and diodes used in high-voltage power conversion equipment.
The Mersen E300637 has a 900 A rated current.
It is rated for 1000 V AC (IEC) and 1100 V AC (UL) applications.
The fuse features open slot blade terminals with an integrated striker indicator for secure installation and convenient remote monitoring.
It is commonly installed in renewable energy systems, industrial drives, converters, UPS systems and other high-voltage power electronic installations.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to deliver dependable protection for critical power electronic equipment operating in demanding industrial 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...