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MERSEN FUSE CC 7,5 GRD 122 EF 0450 D122GD75V450EF
High-speed fuse delivering reliable circuit protection for demanding DC applications up to 750VDC and 450A with striker indication and open slot blades.
£486.32
Why Choose the Mersen P220951 Protistor® High-Speed Fuse?
The Mersen P220951 (D122GD75V450EF) is a premium Protistor® square body high-speed semiconductor fuse designed to provide exceptional protection for sensitive power electronic equipment operating in demanding DC applications. Engineered to safeguard semiconductors such as IGBTs, thyristors, diodes and rectifiers, this fuse delivers rapid fault interruption to minimise damage during short-circuit events.
As part of the proven Mersen Protistor® Size 122 gR 750 VDC series, the P220951 combines low let-through energy with a high breaking capacity, making it ideal for protecting modern power conversion equipment. Its square body construction, open slot blade terminals and integrated striker ensure dependable operation while simplifying installation and remote fuse indication.
Rated at 450 A with a 750 V DC IEC voltage rating, the P220951 is widely used in railway auxiliary systems, battery energy storage, industrial drives, DC power supplies and renewable energy installations where reliable semiconductor protection is essential.
Key Advantages
- High-speed gR semiconductor protection fuse.
- 450 A current rating for demanding industrial DC applications.
- 750 V DC IEC rated voltage.
- Protects IGBTs, thyristors, diodes and rectifier assemblies.
- Low I²t characteristics minimise semiconductor damage.
- Integrated striker for remote fuse indication.
- Robust square body construction with open slot blade terminals.
Key Features
- Mersen Protistor® Size 122 gR series.
- Manufacturer part number: P220951.
- Catalogue number: D122GD75V450EF.
- 450 A rated current.
- 750 V DC IEC rated voltage.
- Square body high-speed semiconductor fuse.
- Open slot blade connections.
- Integrated striker indicator.
Reliable Protection for Critical Power Electronics
High-speed semiconductor fuses are designed to protect expensive electronic power devices from damaging fault currents. Their rapid operating characteristics reduce thermal and electrical stress, helping extend equipment life while minimising costly downtime.
The Mersen Protistor® range is widely specified for railway systems, industrial automation, renewable energy installations and power conversion equipment where dependable semiconductor protection is critical for operational reliability.
Typical Applications
- Railway traction and auxiliary power systems.
- Battery energy storage systems.
- Industrial DC drives.
- Power converters and rectifiers.
- Renewable energy systems.
- UPS and critical power equipment.
- Industrial semiconductor protection.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | gR | |
| Voltage | 750 V | |
| Item number | P220951 | |
| Catalogue No | D122GD75V450EF | |
| Description | Square Body High-Speed Fuse Protistor® Size 122 gR 750VDC IEC 450A With Striker Open Slot Blades | |
| EAN/UPC Code | 3605340248357 | |
| Rated voltage DC IEC | 750 V | |
| Ampere Rating | 450 A | |
| RoHS Compliant | Yes | |
| AC or DC | DC | |
| Speed/Characteristic | gR | |
| Fuse Size | 122 | |
| Mounting | Bolted | |
| Melting I2t | 63.5 kA²s | |
| Max. Rated Breaking Capacity DC | 100 kA | |
| Design Details | gRD | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | Open Slot Blades | |
| Product Width | 59 mm | |
| Product Length | 206.4 mm | |
| Product Height | 63 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.3 kg | |
| Sell Pack Width | 130 mm | |
| Sell Pack Length | 264 mm | |
| Sell Pack Height | 95 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 1.3 kg | |
| Power Dissipation at Rated Current Value | 90 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen P220951 used for?
The Mersen P220951 is a high-speed semiconductor fuse designed to protect power electronic devices such as IGBTs, thyristors, diodes and rectifiers from damaging fault currents.
What is the current rating of this fuse?
The fuse has a 450 A rated current.
What voltage is the P220951 rated for?
The fuse is rated for 750 V DC (IEC).
Does this fuse include a striker?
Yes. The P220951 incorporates an integrated striker that can be used for fuse indication or auxiliary signalling.
Where is the P220951 commonly installed?
It is commonly installed in railway systems, battery storage installations, industrial power converters, DC drives and other semiconductor-based power electronic equipment.
Trusted for High-Speed Semiconductor Protection
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, railway engineers, panel builders and industrial automation specialists for delivering rapid fault protection and dependable long-term performance.
