Bussmann Eaton 170M Series High-Speed Square Body Fuse, Class aR, 690V

Bussmann 170M3218 Eaton Series High Speed Square Body Fuse, 350A Class aR

The Bussmann 170M3218 is an Eaton Bussmann series high speed square body fuse engineered for semiconductor protection in demanding power electronics applications. Rated 1250V (IEC) / 1300V (UL) with a 350A amperage rating and a 200 kAIC interrupt rating, this Class aR fuse is built for accompanied semiconductor protection where fast, reliable clearing is critical. It features blade end X blade end terminals per the DIN 43 620 standard and includes a top fuse status indicator so maintenance teams can quickly confirm fuse condition without disconnecting the circuit.

Key Features

• Square Body Construction: Square body design with slotted center bolted tags for a secure, low-resistance connection in blade end X blade end mounting.
• Compact Dimensions: Product height of 65 mm, length/depth of 305 mm, and width of 145 mm at 348 g, sized for DIN 43 620 fuse mounting systems.
• Dual Voltage Rating: Rated 1250V (IEC) and 1300V (UL) for use across both IEC and UL-governed installations.
• High Amperage & Interrupt Rating: 350A continuous rating with a 200 kAIC interrupt rating for high-fault-current environments.
• Class aR Utilization: Classified aR (accompanied semiconductor protection), purpose-built to protect semiconductor devices such as SCRs and diodes.
• Top Fuse Status Indicator: Built-in top-mounted status indicator provides a fast visual check of fuse condition.
• High-Speed Clearing Performance: Pre-arc I2t of 10000 and clearing I2t of 68500 at 660V, with a clearing loss of 55, delivering fast current-limiting action to protect sensitive semiconductor loads.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 350 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 68500 at 660 V
• Clearing Loss: 55
• Compliances: CE Marked
• Fuse Shape: Square body, slotted center bolted tags
• Insulated Metal Gripping Lugs (IMGL): No
• Packaging Type: Standard
• Pre Arc I2t: 10000
• Product Height: 65 mm
• Product Length Depth: 305 mm
• Product Weight: 348 g
• Product Width: 145 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 690 V
• Voltage Type: AC

Typical Applications

• Semiconductor Device Protection (SCRs, Diodes)
• Power Electronics and Drive Systems
• Industrial Motor Control Circuits
• High-Speed Switching Equipment
• Panelboard and Switchgear Fuse Protection

Why Bussmann?

Bussmann by Eaton engineers this 170M3218 high speed fuse with a rugged square body, slotted bolted tag terminals, and DIN 43 620 compatibility for dependable performance in demanding semiconductor protection circuits. With dual 1250V (IEC) / 1300V (UL) ratings, a 200 kAIC interrupt rating, Class aR utilization, and a top fuse status indicator for quick condition checks, it delivers the fast, code-compliant protection professionals expect from the Eaton Bussmann series.