Bussmann 170M6693 Class aR Square Body Fuse, 550A 1250V

Bussmann 170M6693 Class aR Square Body Fuse, 550A 1250V

The Bussmann 170M6693 is a Class aR square body fuse rated 550A, engineered for demanding DC and power conversion circuits where fast, reliable overcurrent protection is critical. Built to a US-style square body design (-FU/115, without indicator) and IEC Rated, this fuse carries a voltage rating of 700V (UL) / 690V (IEC) and delivers a 100 kAIC interrupt rating for dependable performance under high fault-current conditions. It is CE Marked, supporting use in professional electrical and industrial control applications.

Key Features

• Amperage Rating: 550A for high-current circuit protection in demanding electrical systems.
• Voltage Rating: 700V (UL), 690V (IEC) for use across UL and IEC rated installations.
• Fuse Class: Class aR, IEC Rated design suited to DC and semiconductor-adjacent protection duty.
• Square Body Construction: US-style square body (-FU/115, without indicator) for standard fuse mounting compatibility.
• Interrupt Rating: 100 kAIC for reliable clearing performance under high fault-current conditions.
• Clearing I²t: 325,000 A²s at 1000V and 435,000 A²s at 1250V for precise coordination with protected equipment.
• Pre-Arc I²t: 55,000 A²s, with rated watt loss of 110W.
• Fuse Indicator: Non-Indicating design.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 550 A
• Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
• Certifications: IEC Rated
• Class: Class aR
• Clearing I²t: 325000 at 1000 V, 435000 at 1250 V
• Compliances: CE Marked
• Fuse Indicator: Non Indicating
• Interrupt Rating: 100 kAIC
• Packaging Type: Standard
• Pre Arc I²t: 55000
• Voltage Rating: 700 V (UL), 690 V (IEC)
• Watt Losses: 110 W
• Product Type: Square body US style, -FU/115 without indicator

Typical Applications

• DC Common Bus Systems
• DC Drives
• Power Converters and Rectifiers
• Reduced Voltage Starters

Why Bussmann?

Bussmann fuses like the 170M6693 are built with IEC Rated, CE Marked construction and a square body design engineered for consistent, code-compliant performance. With a 100 kAIC interrupt rating and Class aR protection characteristics, this fuse is suited to professional DC drive, power converter, and reduced voltage starter applications where dependable overcurrent protection is essential.