Bussmann 170M4390 Eaton Series Class aR High-Speed Fuse, 700V, 250A

Bussmann 170M4390 Eaton Series Class aR High-Speed Fuse, 700V, 250A

The Bussmann 170M4390 is an Eaton Bussmann series high speed square body fuse engineered for semiconductor protection in demanding power electronics applications. Rated 700V (UL) / 690V (IEC) and 250A with a 100 kAIC interrupting rating, this Class aR fuse features a square body design with flush end contacts for compact, high-density panel layouts. Its accompanied semiconductor (aR) utilization category and fast clearing characteristics make it well suited for protecting rectifiers, drives, and other solid-state power devices where speed and reliability are critical.

Key Features

• Fuse Shape: Square body with flush end contacts for compact busbar and panel mounting.
• Voltage Rating: 700V (UL) / 690V (IEC) for use in high-voltage AC power electronics circuits.
• Amperage Rating: 250A continuous current rating for reliable semiconductor circuit protection.
• Interrupting Rating: 100 kAIC to safely clear high fault currents in industrial power systems.
• Utilization Category: Class aR (accompanied semiconductor protection) for coordinated protection of power semiconductor devices.
• Clearing I²t: 46000 at 1000V, 61500 at 1250V, with a pre-arc I²t of 7750 for fast, predictable clearing performance.
• Watt Losses: 60W, an important design consideration for thermal management in enclosed switchgear.
• Compact Dimensions: 170 mm width x 73 mm depth x 52 mm height at 559 g, sized for standard high-speed fuse mounting centers.

Certifications & Compliance

• UL Rated, 700V
• IEC Rated, 690V
• CE Marked

Technical Specifications

• Amperage Rating: 250 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I²t: 46000 at 1000 V, 61500 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: 7750
• Product Height: 52 mm
• Product Length/Depth: 73 mm
• Product Weight: 559 g
• Product Width: 170 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 1250 V
• Voltage Type: AC
• Watt Losses: 60 W

Typical Applications

• Semiconductor Device Protection
• Power Electronics and Rectifier Circuits
• Class aR Accompanied Semiconductor Protection Schemes
• High-Speed Circuit Protection in Industrial Power Equipment
• Panelboard and Switchgear Fuse Blocks Sized for Square Body Fuses

Why Bussmann?

Bussmann by Eaton engineers the 170M4390 as a Class aR high speed fuse with the clearing I²t, pre-arc I²t, and interrupting performance data semiconductor applications depend on. Backed by IEC ratings and CE marking, this square body, flush-contact fuse delivers the fast, coordinated protection professional electrical and power electronics installations require.