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MERSEN FUSE CC 7,5 GRC 122 TTF 0250 B090437
High-speed DC fuse providing reliable protection up to 750VDC and 250A with striker indication and metric threaded flush ends.
£359.84
Why Choose the Mersen B090437 High-Speed Fuse?
The Mersen B090437 (D122GC75V250TF) is a high-performance Protistor® square body semiconductor fuse engineered to provide fast and reliable protection for power semiconductors, converters and DC power systems. Designed for demanding industrial applications, this high-speed fuse delivers exceptional fault current limitation while helping minimise damage to sensitive electronic components.
Part of the trusted Mersen Protistor® Size 122 gR 750 VDC series, the B090437 is optimised for railway traction systems, DC power equipment, battery energy storage, power conversion systems and other applications where rapid protection of semiconductor devices is essential. Its robust square body construction, low power loss and high breaking performance ensure dependable long-term operation.
With a 250 A current rating, 750 V DC rating and gR operating class, this fuse provides full-range semiconductor protection. The integrated striker indicator enables rapid fuse status identification, reducing maintenance time and improving system availability.
Key Advantages
- High-speed semiconductor protection fuse for critical DC applications.
- 250 A current rating for demanding industrial power systems.
- 750 V DC voltage rating suitable for modern power conversion equipment.
- gR full-range protection for semiconductor devices.
- Integrated striker indicator for fast maintenance identification.
- Low I²t and low power loss help minimise damage during fault conditions.
Key Features
- Mersen Protistor® Size 122 series.
- Square body high-speed fuse.
- 250 A rated current.
- 750 V DC IEC rated voltage.
- gR operating class for semiconductor protection.
- Flush end connections with metric threads.
- Integrated striker for blown fuse indication.
- Designed for railway, industrial and power electronic applications.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically engineered to protect sensitive power electronic components against damaging short circuits. Their low let-through energy and rapid fault clearing characteristics help reduce equipment damage, minimise downtime and improve overall system reliability.
The Mersen Protistor® range is widely specified by equipment manufacturers for applications requiring dependable protection of rectifiers, inverters, converters, battery systems and industrial power electronics operating under demanding electrical conditions.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial power converters.
- Semiconductor protection.
- Battery energy storage systems.
- Variable speed drives and inverters.
- Industrial DC power distribution equipment.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | gR | |
| Voltage | 750 V | |
| Item number | B090437 | |
| Catalogue No | D122GC75V250TF | |
| Description | Square Body High-Speed Fuse Protistor® Size 122 gR 750VDC IEC 250A With Striker Flush ends metric threads | |
| EAN/UPC Code | 3605340090000 | |
| Rated voltage DC IEC | 750 V | |
| Ampere Rating | 250 A | |
| RoHS Compliant | Yes | |
| AC or DC | DC | |
| Speed/Characteristic | gR | |
| Fuse Size | 122 | |
| Mounting | Bolted | |
| Melting I2t | 18.05 kA²s | |
| Max. Rated Breaking Capacity DC | 100 kA | |
| Design Details | gRC | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Brass | |
| Connection/Terminal Type | Flush ends | |
| Product Width | 59 mm | |
| Product Length | 131 mm | |
| Product Height | 63 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.43 kg | |
| Sell Pack Width | 130 mm | |
| Sell Pack Length | 200 mm | |
| Sell Pack Height | 90 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 1.43 kg | |
| Power Dissipation at Rated Current Value | 46.7 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen B090437 used for?
The B090437 is a high-speed semiconductor fuse designed to protect power electronic devices from damaging short circuits in industrial and DC power applications.
What is the current rating of this fuse?
This fuse has a 250 A current rating.
What voltage is the fuse designed for?
The Mersen B090437 is rated for 750 V DC operation.
What does the gR operating class mean?
The gR classification provides full-range protection for semiconductor devices, protecting against both overloads and short circuits.
What is the purpose of the integrated striker?
The integrated striker provides mechanical indication that the fuse has operated, simplifying maintenance and fault diagnosis.
Trusted by Industrial Power System Designers
Mersen Protistor® semiconductor fuses are trusted worldwide for protecting critical power electronic equipment, delivering exceptional reliability, rapid fault interruption and long service life across demanding industrial and transportation applications.
