Bussmann 170M3669 Eaton Series High-Speed Square Body Fuse, Class aR, 400A

Bussmann 170M3669 Eaton Series High-Speed Square Body Fuse, Class aR, 400A

The Bussmann 170M3669 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 400A with a 200 kAIC interrupting rating, this Class aR fuse uses a blade end X blade end connection for secure, low-resistance mounting in bolted fuse holders. Its square body, center-bolted-tag construction and precise clearing characteristics make it well suited for protecting semiconductor devices such as rectifiers and converters from overcurrent conditions.

Key Features

• Electrical Rating: 700V (UL), 690V (IEC), 400A rating suited for high-power semiconductor protection circuits.
• Interrupting Rating: 200 kAIC interrupting capacity for reliable performance under high fault-current conditions.
• Utilization Category: Class aR (accompanied semiconductor protection) fuse designed for high-speed clearing to safeguard semiconductor devices.
• Fuse Shape: Square body with center bolted tags and blade end X blade end connection for a secure, repeatable mounting interface.
• Current-Limiting Performance: Pre-arc I2t of 15000 and clearing I2t of 105000 at 660V for precise, fast current limitation.
• Watt Losses: 60W power dissipation rating.
• Compact Dimensions: 305 mm length/depth x 145 mm width x 65 mm height, weighing 319 g.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 400 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 105000 at 660 V
• Compliances: CE Marked
• Fuse Shape: Square body, center bolted tags
• Insulated Metal Gripping Lugs (IMGL): No
• Packaging Type: Standard
• Pre Arc I2t: 15000
• 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: 690 V
• Voltage Type: AC
• Watt Losses: 60 W

Typical Applications

• Semiconductor Device Protection
• Power Converter and Rectifier Circuits
• Industrial Power Electronics Equipment
• Motor Drive and Variable Frequency Drive Systems

Why Bussmann?

Bussmann by Eaton engineers the 170M3669 with a robust square body, center-bolted-tag construction and a 200 kAIC interrupting rating to deliver dependable, code-compliant overcurrent protection for semiconductor circuits. Its Class aR utilization category and precise pre-arc/clearing I2t characteristics reflect the current-limiting accuracy professionals need when protecting sensitive power electronics, while IEC Rated and CE Marked compliance support use in demanding industrial installations.