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MERSEN FUSE CC12 SRG 272 QF 840 CC12BODKCV3SRG2X72
High-speed DC fuse with integrated striker indication, rated 840A at 1200VDC for semiconductor protection in industrial and renewable energy applications.
£1,244.13
Why Choose the Mersen H079449 High-Speed Fuse?
The Mersen H079449 (D272SG120V840QF) is a high-performance Protistor® square body semiconductor fuse engineered to provide rapid and reliable protection for power semiconductors, railway traction equipment and high-power DC systems. Designed for demanding industrial applications, this high-speed fuse delivers exceptional fault current limitation while helping protect valuable electronic components from catastrophic short circuits.
Part of the advanced Mersen Protistor® Size 2x72 aR 1200 VDC series, the H079449 is specifically developed for modern DC power equipment operating at elevated temperatures. Its low I²t characteristics, reduced power losses and long service life make it an excellent choice for railway applications, energy storage systems, EV charging infrastructure and industrial power conversion equipment.
With a 840 A current rating, 1200 V DC IEC voltage rating and aR operating class, the H079449 delivers partial-range semiconductor protection for high-performance electronic power systems. The integrated striker indicator enables quick fuse status identification, simplifying maintenance and reducing system downtime.
Key Advantages
- High-speed semiconductor protection fuse for demanding DC applications.
- 840 A current rating for high-power industrial systems.
- 1200 V DC IEC voltage rating for modern power electronics.
- aR operating class specifically designed for semiconductor protection.
- Integrated striker indicator for simplified maintenance.
- Low I²t and reduced power loss help minimise damage during fault conditions.
Key Features
- Mersen Protistor® Size 2x72 series.
- Square body high-speed semiconductor fuse.
- 840 A rated current.
- 1200 V DC IEC rated voltage.
- aR semiconductor protection characteristic.
- Integrated striker indication system.
- Bolted mounting with copper L-bracket terminals.
- Designed for railway traction, power conversion and energy storage applications.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses protect sensitive power electronic devices by rapidly interrupting high fault currents before they can damage expensive components. Their low let-through energy helps improve system reliability while reducing repair costs and operational downtime.
The Mersen Protistor® range is widely used throughout railway traction systems, industrial converters, battery energy storage, renewable energy installations and EV charging infrastructure where dependable semiconductor protection is essential for continuous operation.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial DC power converters.
- Battery energy storage systems.
- Electric vehicle charging infrastructure.
- Renewable energy power conversion equipment.
- High-power semiconductor protection.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Size | 2x72 mm | |
| Fuse Class | aR | |
| Voltage | 1200 V | |
| Item number | H079449 | |
| Catalogue No | D272SG120V840QF | |
| Description | Square Body High-Speed Fuse Protistor® Size 2x72 aR 1200VDC IEC 840A With Striker | |
| EAN/UPC Code | 3605340034158 | |
| Rated voltage DC IEC | 1200 V | |
| Ampere Rating | 840 A | |
| RoHS Compliant | Yes | |
| AC or DC | DC | |
| Speed/Characteristic | aR | |
| Fuse Size | 2x72 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 880 kA²s | |
| Melting I2t | 158 kA²s | |
| Max. Rated Breaking Capacity DC | 100 kA | |
| Design Details | SRG | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Copper | |
| Connection/Terminal Type | L Brackets | |
| Product Width | 60 mm | |
| Product Length | 163 mm | |
| Product Height | 162.7 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 2.4 kg | |
| Sell Pack Width | 170 mm | |
| Sell Pack Length | 200 mm | |
| Sell Pack Height | 90 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 2.4 kg | |
| Power Dissipation at Rated Current Value | 275 W | |
| HS Code | 85351000 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen H079449 used for?
The H079449 protects high-power semiconductor devices used in railway systems, DC power converters, battery storage systems and other industrial power electronic applications.
What is the current rating of this fuse?
This fuse has a 840 A rated current.
What voltage is the fuse designed for?
The Mersen H079449 is rated for 1200 V DC IEC operation.
What does the aR operating class mean?
The aR operating class is specifically designed to provide short-circuit protection for semiconductor devices while allowing overload protection to be provided elsewhere in the system.
Does this fuse include a blown fuse indicator?
Yes. The H079449 includes an integrated striker mechanism to provide clear indication when the fuse has operated.
Trusted by High-Power System Designers Worldwide
Mersen Protistor® semiconductor fuses are trusted worldwide to protect critical power electronic equipment, delivering rapid fault interruption, exceptional reliability and long service life across demanding industrial and transportation applications.
