Bussmann 170M3989 High-Speed Square Body Fuse, Class aR, 315A, 700V

Bussmann 170M3989 High-Speed Square Body Fuse, Class aR, 315A, 700V

The Bussmann 170M3989 is an Eaton Bussmann series high-speed square body fuse engineered for semiconductor protection in demanding power electronics applications. Rated 700V (UL) and 690V (IEC) with a 315A amperage rating and a 150 kAIC interrupt rating, this Class aR fuse is built to the DIN 43 620 standard and features a top fuse status indicator for quick visual confirmation of fuse condition. Its square body design with slotted, center-bolted tags delivers reliable, accompanied semiconductor protection for coordinated circuit designs.

Key Features

• Voltage Rating: 700V (UL) and 690V (IEC), with a 1000V AC voltage rating for high-voltage power electronics circuits.
• Amperage Rating: 315A for robust current-carrying capacity in demanding semiconductor circuits.
• Interrupt Rating: 150 kAIC to safely clear high fault currents.
• Utilization Category: Class aR (accompanied semiconductor protection) for use alongside coordinated upstream overcurrent protection.
• Fuse Shape: Square body with slotted, center-bolted tags built to the DIN 43 620 standard.
• Status Indicator: Top fuse status indicator provides quick visual confirmation of fuse condition.
• Energy Let-Through: Pre-arc I2t of 21,500 and clearing I2t of 130,000 at 1000V for predictable coordination in semiconductor protection schemes.
• Watt Losses: 60W rated power loss.

Certifications & Compliance

• UL Recognized
• CE Marked

Technical Specifications

• Amperage Rating: 315 A
• Application: semiconductor protection
• Certifications: UL Recognized
• Clearing I2t: 130000 at 1000 V
• Compliances: CE Marked
• Fuse Shape: Square body, slotted center bolted tags
• Insulated Metal Gripping Lugs (IMGL): No
• Packaging Type: Standard
• Pre Arc I2t: 21500
• Product Height: 65 mm
• Product Length Depth: 305 mm
• Product Weight: 319 g
• Product Width: 145 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 1000 V
• Voltage Type: AC
• Watt Losses: 60 W

Typical Applications

• Semiconductor Protection for Power Electronics
• Variable Frequency Drives and Motor Control Systems
• Power Conversion and Rectifier Circuits
• Industrial High-Speed Fusing for Critical Equipment

Why Bussmann?

Bussmann by Eaton is a trusted name in circuit protection, and the 170M3989 reflects that standard with UL Recognized and CE Marked construction built to the DIN 43 620 standard. The Class aR rating and top fuse status indicator make this fuse a dependable choice for coordinated, code-compliant semiconductor protection in professional power electronics installations.