Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE CC12 SRG 72 QF 315 CC12BODKCV3SRG72Q315M
High-speed aR characteristic fuse rated at 1200 VDC and 315 A with striker indication and L bracket terminals for bolted mounting.
£535.65
Why Choose the Mersen N079431 High-Speed Semiconductor Fuse?
The Mersen N079431 (D72SG120V315QF) is a Protistor® Size 72 square body high-speed semiconductor fuse developed to provide fast, dependable protection for railway power circuits, auxiliary systems and other demanding high-voltage DC power electronics. Its rapid fault-clearing performance helps minimise the energy transferred to sensitive semiconductor components during short-circuit conditions.
Rated at 315 A and 1200 V DC, the N079431 features an aR operating characteristic specifically designed for semiconductor short-circuit protection. Its low I²t performance, reduced power losses and ceramic square body construction make it suitable for modern DC equipment operating under elevated temperatures and demanding electrical conditions.
The fuse incorporates silver-plated copper L-bracket terminals for secure bolted installation and an integrated striker indication system for quick identification after fuse operation. With a maximum DC breaking capacity of 100 kA, the Mersen N079431 provides robust protection for critical power conversion and transportation equipment.
Key Advantages
- High-speed aR semiconductor protection for demanding DC systems.
- 315 A current rating with a 1200 V DC IEC voltage rating.
- 100 kA DC breaking capacity for reliable fault interruption.
- Low clearing I²t helps minimise damage to protected semiconductor components.
- Integrated striker indicator simplifies inspection and maintenance.
- Designed for railway power, auxiliary circuits and industrial power conversion.
Key Features
- Mersen Protistor® Size 72 high-speed fuse.
- Manufacturer reference: N079431.
- Catalogue number: D72SG120V315QF.
- Square body ceramic construction.
- Bolted mounting configuration.
- Silver-plated copper L-bracket terminals.
- Integrated striker indication system.
- RoHS compliant.
Reliable Protection for High-Power DC Electronics
High-speed semiconductor fuses are designed to interrupt fault currents significantly faster than conventional industrial fuses. This rapid response limits the thermal and electrical energy reaching IGBTs, thyristors, diodes and other sensitive power electronic components, helping reduce equipment damage and operational downtime.
The Mersen Protistor® DC fuse range is engineered for equipment operating at elevated temperatures, with low watt loss and low I²t characteristics supporting dependable protection and a long operational life. Correct coordination with the protected semiconductor and system design remains essential.
Typical Applications
- Railway traction power systems.
- Railway auxiliary electrical circuits.
- Industrial DC converters and inverters.
- Battery energy storage systems.
- Renewable energy power conversion equipment.
- Protection of high-power semiconductor devices.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 1200 V | |
| Item number | N079431 | |
| Catalogue No | D72SG120V315QF | |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1200VDC IEC 315A With Striker L Brackets | |
| EAN/UPC Code | 3605340033977 | |
| Rated voltage DC IEC | 1200 V | |
| Ampere Rating | 315 A | |
| RoHS Compliant | Yes | |
| AC or DC | DC | |
| Speed/Characteristic | aR | |
| Fuse Size | 72 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 90 kA²s | |
| Max. Rated Breaking Capacity DC | 100 kA | |
| Design Details | SRG | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | L Brackets | |
| Product Width | 60 mm | |
| Product Length | 163 mm | |
| Product Height | 76.5 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.15 kg | |
| Sell Pack Width | 130 mm | |
| Sell Pack Length | 200 mm | |
| Sell Pack Height | 95 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 1.15 kg | |
| Power Dissipation at Rated Current Value | 110 W | |
| HS Code | 85351000 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen N079431 used for?
The Mersen N079431 is designed to provide high-speed short-circuit protection for semiconductor devices used in railway power systems, auxiliary circuits and other high-voltage DC power electronic equipment.
What are the electrical ratings of the N079431?
The fuse is rated at 315 A and 1200 V DC IEC, with a maximum rated breaking capacity of 100 kA DC.
What does the aR operating characteristic mean?
The aR characteristic provides partial-range protection for semiconductor devices, primarily against short-circuit currents. Separate overload protection may be required within the system.
Does the Mersen N079431 include an indicator?
Yes. It includes an integrated striker indication system that helps identify when the fuse has operated.
How is the N079431 installed?
The fuse uses a bolted mounting arrangement with silver-plated copper L-bracket terminals. Installation should be completed by suitably qualified electrical personnel.
Can the Mersen N079431 be reused after operating?
No. It is a single-use protective device and must be replaced after the fuse element has operated.
Trusted Protection for Critical Power Electronics
Mersen Protistor® high-speed fuses are used to protect critical semiconductor equipment in transportation, power conversion, renewable energy and industrial DC applications where rapid fault interruption is essential.
