High-speed aR fuse for semiconductor protection with bolted mounting, ceramic body, and striker indication system, rated 315A at 1250VAC IEC and 1300VAC UL.
£166.67
The Mersen B300611 is a premium square body high-speed semiconductor fuse developed to provide exceptional protection for modern power electronic equipment. Part of the trusted Mersen Protistor® Size 71 series, this fuse is engineered to protect sensitive semiconductor devices including IGBTs, thyristors, diodes and rectifiers operating in demanding industrial environments.
Designed with an ultra-fast aR operating characteristic, the B300611 rapidly interrupts fault currents before excessive energy can damage valuable semiconductor components. Its solidified sand construction, silver-plated contact surfaces and integrated striker indicator provide reliable operation, high interrupting performance and long service life.
With a 315 A current rating and 1250 V AC IEC / 1300 V AC UL voltage ratings, the Mersen B300611 is ideal for protecting industrial motor drives, power converters, UPS systems, renewable energy equipment and other high-power semiconductor applications.
High-speed semiconductor fuses are designed to interrupt fault currents before they can damage expensive power electronic devices. Their low let-through energy helps protect semiconductor assemblies, reduce maintenance costs and improve overall equipment reliability in demanding industrial applications.
The Mersen Protistor® Size 71 range offers proven protection for converters, inverters, motor drives and UPS systems. Its advanced construction provides excellent cycling capability together with dependable short-circuit protection for modern semiconductor equipment.
| Item number | B300611 |
|---|---|
| Catalogue No | PC71UD13C315EF |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 315A With Striker Open Slot Blades |
| EAN/UPC Code | 3605340330960 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 315 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 129 kA²s |
| Melting I2t | 16 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 | 76 W |
| HS Code | 85351000 |
The B300611 protects semiconductor devices such as IGBTs, thyristors, diodes and rectifiers from damaging short-circuit currents.
This fuse has a 315 A rated current.
It is rated for 1250 V AC (IEC) and 1300 V AC (UL).
The B300611 features open slot blade (EF style) terminals together with an integrated striker indicator.
It is commonly installed in industrial drives, converters, UPS systems, renewable energy equipment and other power electronic applications requiring high-speed semiconductor protection.
Mersen Protistor® semiconductor fuses are trusted throughout industry for delivering dependable, ultra-fast protection of valuable 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...