Bussmann 170M4746 Class aR High Speed Fuse, 550A

Bussmann 170M4746 Class aR High Speed Fuse, 550A

The Bussmann 170M4746 Class aR High Speed Fuse delivers dependable overcurrent protection for demanding power electronics applications, engineered with a 550A RMS current rating, a 1000 Vac voltage rating, and a 100 kAIC interrupt rating. Built as a UL Recognized, IEC Rated, and CSA Certified square body US style fuse, it is designed for DC common bus, DC drives, power converters/rectifiers, and reduced voltage starter circuits where fast, precise clearing performance is critical to protecting sensitive semiconductor devices.

Key Features

• Current Rating: 550A RMS delivers high-capacity circuit protection for demanding DC power systems.
• Voltage Rating: 1000 Vac supports use in high-voltage DC and power conversion equipment.
• Fuse Class: Class aR high speed construction is optimized for semiconductor and power electronics protection.
• Interrupt Rating: 100 kAIC ensures dependable performance under high fault-current conditions.
• Let-Through Energy: Clearing I2t of 465000 at 1000V and Pre-Arc I2t of 95000 provide precise coordination with semiconductor devices.
• Fuse Indicator: Non Indicating design.
• Watt Losses: 95W rated power dissipation.

Certifications & Compliance

• UL Recognized
• IEC Rated
• CSA Certified
• RoHS Compliant
• CE Marked

Technical Specifications

• Amperage Rating: 550A
• Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
• Class: Class aR
• Clearing I2t: Clearing at 1000V: 465000
• Current Rating: 550A RMS
• Fuse Indicator: Non Indicating
• Interrupt Rating: 100 kAIC
• Packaging Type: Standard
• Pre Arc I2t: 95000
• Voltage Rating: 1000 Vac
• Watt Losses: 95W
• Product Type: Square body US style, -FKE/115 type K indicator for micro
• Product Length: 5.433 IN
• Product Height: 2.087 IN
• Product Weight: 1.6456 LB
• Product Width: .315 IN
• Product Details: Square body US style, -FKE/115 type K indicator for micro

Typical Applications

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

Why Bussmann?

Bussmann fuses are manufactured to consistent, code-compliant standards, backed by UL Recognition, IEC and CSA certification, and RoHS and CE compliance for global electrical applications. The 170M4746 Class aR High Speed Fuse pairs a defined 550A RMS current rating and 1000 Vac voltage rating with a 100 kAIC interrupt rating, giving engineers and electricians a dependable overcurrent protection component for critical DC power and drive systems.