1250A, 1250VAC high-speed fuse with striker indication and flush end silver-plated brass terminals, designed for semiconductor protection in industrial applications.
£580.92
The Mersen K300734 is a premium Protistor® square body high-speed semiconductor fuse designed to provide ultra-fast protection for modern power electronic equipment. Engineered for demanding industrial environments, it protects IGBTs, thyristors, diodes, rectifiers, inverters and power conversion systems against damaging short-circuit currents whilst minimising energy let-through and reducing equipment downtime.
Part of the Mersen Protistor® Size 2x73 aR series, the K300734 combines a robust square body design with silver-plated contact surfaces and an integrated striker indicator. Its high interrupting capability and low I²t characteristics make it ideal for industrial drive systems, renewable energy installations, UPS equipment and heavy-duty automation applications.
With a 1250 A current rating, 1250 V AC IEC voltage rating and 100 kA breaking capacity, the K300734 delivers dependable semiconductor protection for high-power industrial applications.
High-speed semiconductor fuses are engineered to interrupt fault currents before excessive thermal energy reaches sensitive semiconductor devices. Their ultra-fast operating characteristics help extend equipment life, improve system reliability and minimise costly production downtime.
The Mersen Protistor® range is trusted worldwide by machine builders, panel manufacturers and industrial engineers for protecting industrial drives, renewable energy converters, UPS systems and heavy-duty power conversion equipment.
| Item number | K300734 |
|---|---|
| Catalogue No | PC273UD13C13CTF |
| Description | Square Body High-Speed Fuse Protistor® 2x73 aR 1250VAC IEC 1250A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340332797 |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 1250 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 2x73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 2660 kA²s |
| Melting I2t | 336 kA²s |
| AC Max I.R./Breaking Capacity | I1: 100 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 167 mm |
| Product Length | 91 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 2.53 kg |
| Sell Pack Width | 90 mm |
| Sell Pack Length | 205 mm |
| Sell Pack Height | 95 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 2.53 kg |
| Power Dissipation at Rated Current Value | 262 W |
| HS Code | 85351000 |
| Country of Manufacture | France |
The K300734 provides ultra-fast protection for high-power semiconductor devices including IGBTs, thyristors, diodes and industrial power converters.
The Mersen K300734 has a 1250 A current rating.
It is rated for 1250 V AC IEC operation.
Yes. The K300734 incorporates an integrated striker indicator for fast identification of fuse operation.
It is commonly installed in industrial drives, renewable energy systems, UPS equipment and high-power semiconductor protection applications.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to deliver reliable 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...