Protistor® fuse with fast-acting aR characteristic, rated for 350A at 1250VAC IEC and 1300VAC UL, featuring integrated striker indication and open slot blades for bolted mounting.
£170.23
The Mersen C300612 is a premium Protistor® Size 71 high-speed semiconductor fuse designed to provide outstanding protection for sensitive power electronic components in demanding industrial applications. As part of the trusted Mersen Protistor® Size 71 aR series, it delivers ultra-fast fault interruption to safeguard IGBTs, thyristors, diodes and other semiconductor devices from destructive short-circuit currents.
Engineered specifically for modern power conversion equipment, the C300612 features precision die-cut fuse elements embedded in solidified sand to achieve exceptionally low let-through energy and high interrupting capacity. Silver-plated contact surfaces and non-magnetic hardware ensure dependable long-term performance in harsh industrial environments.
With a 350 A current rating, 1250 V AC IEC / 1300 V AC UL voltage rating and open slot blade terminals with an integrated striker, the Mersen C300612 is ideally suited for variable frequency drives, UPS systems, industrial inverters and renewable energy converters where reliable semiconductor protection is essential.
High-speed semiconductor fuses are engineered to protect valuable power electronic components by rapidly interrupting fault currents before they can damage sensitive devices. Their low I²t performance reduces thermal stress on semiconductor assemblies, improving equipment reliability while reducing costly downtime.
The Mersen Protistor® range is widely specified by OEMs and industrial engineers for protecting variable frequency drives, industrial motor drives, UPS installations, renewable energy converters and other high-performance power conversion equipment.
| Item number | C300612 |
|---|---|
| Catalogue No | PC71UD13C350EF |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 350A With Striker Open Slot Blades |
| EAN/UPC Code | 3605340330977 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 350 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 178 kA²s |
| Melting I2t | 22 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 | Open Slot Blades |
| Product Width | 51 mm |
| Product Length | 149.4 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.62 kg |
| Sell Pack Width | 140 mm |
| Sell Pack Length | 174 mm |
| Sell Pack Height | 71 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.54 kg |
| Power Dissipation at Rated Current Value | 80 W |
| HS Code | 85351000 |
The C300612 is a high-speed semiconductor fuse designed to protect IGBTs, thyristors, diodes and other power electronic components against short-circuit faults.
The fuse has a 350 A current rating.
It is rated for 1250 V AC (IEC) and 1300 V AC (UL).
The Mersen C300612 is supplied with open slot blade terminals (EF style) for secure installation in compatible fuse assemblies.
Yes. The fuse incorporates an integrated striker indicator that can be used for visual or remote indication when installed with suitable accessories.
Mersen Protistor® semiconductor fuses are trusted by OEMs, machine builders and industrial engineers worldwide for delivering dependable 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...