High-speed aR characteristic fuse rated 315A, 1200VAC IEC, 1300VAC UL with integrated striker indication and DIN 110 blade terminals for semiconductor protection.
£132.07
The Mersen C300543 is an industrial high-speed semiconductor fuse designed to protect sensitive power electronic equipment against damaging short-circuit currents. Developed by Mersen for demanding electrical protection applications, it provides rapid fault interruption for semiconductor components such as IGBTs, thyristors, rectifier diodes and power modules.
The C300543 combines fast operating performance with robust industrial construction, helping limit the thermal and electrical energy transferred to protected components during a fault. This reduces the risk of extensive equipment damage and supports improved reliability in power conversion, motor control and industrial automation systems.
Its compact square-body format makes the Mersen C300543 fuse suitable for installation in compatible fuse holders, busbar assemblies and electrical control equipment. The exact voltage, current, terminal configuration and dimensional requirements should be confirmed against the original Mersen documentation or the markings on the fuse before installation.
Semiconductor components can be damaged by fault currents before conventional circuit protection devices have time to operate. High-speed fuses such as the Mersen C300543 are engineered to interrupt these currents rapidly, limiting the amount of energy that reaches sensitive electronic components.
This type of fuse is commonly used as part of a coordinated protection system within industrial drives, rectifiers, inverters and power supplies. Correct fuse selection is essential, and the replacement device should match the required current rating, voltage rating, operating class, dimensions and terminal arrangement of the original component.
| Current | 11 A |
|---|---|
| Item number | C300543 |
| Catalogue No | PC70UD12C315D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1200VAC IEC 1300VAC UL 315A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330014 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1200 V |
| Ampere Rating | 315 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 70 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 149000 A²s |
| Melting I2t | 20000 A²s |
| AC Max I.R./Breaking Capacity | I1: 150 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | DIN 110 Blades |
| Product Width | 39.8 mm |
| Product Length | 133.4 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.0899 kg |
| Sell Pack Width | 130 mm |
| Sell Pack Length | 140 mm |
| Sell Pack Height | 50 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.3633 kg |
| Power Dissipation at Rated Current Value | 72 W |
| HS Code | 85351000 |
The Mersen C300543 is used to provide high-speed short-circuit protection for semiconductor devices and power electronic equipment.
It is intended for the protection of sensitive components such as IGBTs, thyristors, rectifier diodes and semiconductor power modules.
It should only be used where its electrical ratings, operating characteristic, physical dimensions and terminal configuration match the requirements of the equipment. A standard general-purpose fuse may not provide sufficiently fast semiconductor protection.
Check the markings on the existing fuse and compare them with the original equipment documentation or an official Mersen technical datasheet before ordering or installing a replacement.
The fuse is typically installed inside industrial drives, power converters, rectifier equipment, control cabinets or other electrical systems containing semiconductor power devices.
Mersen high-speed fuses are used by equipment manufacturers, panel builders and maintenance engineers to protect critical semiconductor components and support reliable operation in demanding power electronic systems.
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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...