Bussmann 170M4444 Eaton Series High-Speed Square Body Fuse, Class aR, 450A, 700V

Bussmann 170M4444 Eaton Series High-Speed Square Body Fuse, Class aR, 450A, 700V

The Bussmann 170M4444 is an Eaton Bussmann series high-speed square body fuse engineered for semiconductor protection in demanding industrial power electronics applications. Rated 700V (UL) and 690V (IEC) with a 450A amperage rating and a 100 kAIC interrupting capacity, this Class aR fuse is designed to protect semiconductor devices used alongside other overcurrent protection in AC circuits. The square body design features flush end contacts for reliable, low-resistance connections in high-speed fuse mounting systems.

Key Features

• Electrical Rating: 700V (UL) / 690V (IEC), 450A, 100 kAIC interrupting rating for demanding power electronics circuits.
• Fuse Class: Class aR (accompanied semiconductor protection) utilization category, engineered to work alongside primary overcurrent devices.
• Fuse Shape: Square body construction with flush end contacts for secure, high-speed fuse holder mounting.
• Clearing I²t: 250,000 at 1000V and 335,000 at 1250V for predictable let-through energy during a fault.
• Pre-Arc I²t: 42,000 for consistent time-current characteristics in semiconductor protection circuits.
• Watt Losses: 80W rated power loss for thermal design planning in enclosures and panels.
• Voltage Rating: 1250V AC voltage type rating supports a range of high-voltage industrial applications.

Certifications & Compliance

• IEC Rated (690V IEC voltage rating)
• CE Marked
• Rated 700V per UL

Technical Specifications

• Amperage Rating: 450 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I²t: 250000 at 1000 V, 335000 at 1250 V
• Compliances: CE Marked
• Fuse Shape: Square body, flush end contacts
• Insulated Metal Gripping Lugs (IMGL): No
• Packaging Type: Standard
• Pre Arc I²t: 42000
• Product Height: 51 mm
• Product Length/Depth: 160 mm
• Product Weight: .573 g
• Product Width: 70 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 1250 V
• Voltage Type: AC
• Watt Losses: 80 W

Typical Applications

• Semiconductor Device Protection
• Industrial Power Electronics and Drive Systems
• High-Speed AC Circuit Protection up to 700V
• Commercial and Industrial Electrical Installations

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the 170M4444 reflects that engineering standard with IEC-rated performance and CE marking for compliance in global industrial applications. Its Class aR utilization category and documented clearing and pre-arc I²t values give engineers the data needed to coordinate semiconductor protection with confidence. Choose the Bussmann 170M4444 for reliable, code-compliant high-speed fuse protection in demanding power electronics systems.