Bussmann 170M3442 Eaton Series High-Speed Square Body Fuse, Class aR, 700V/125A

Bussmann 170M3442 Eaton Series High-Speed Square Body Fuse, Class aR, 700V/125A

The Bussmann 170M3442 is an Eaton series high-speed square body fuse engineered for semiconductor protection in demanding AC power circuits. Rated 700V (UL) / 690V (IEC), 125A, with a 100 kAIC interrupt rating, this Class aR fuse features a square body design with flush end contacts and carries a Utilization Category of aR (accompanied semiconductor protection). It is IEC rated and CE marked for use in professional electrical and industrial power applications.

Key Features

• Fuse Shape: Square body design with flush end contacts for secure, reliable mounting in high-speed fuse holders.
• Electrical Ratings: Rated 700V (UL) / 690V (IEC), 125A, with a Voltage Rating of 1250 V AC and a 100 kAIC interrupt rating for demanding power circuits.
• Utilization Category aR: Classified aR (accompanied semiconductor protection) for coordinated protection of semiconductor devices.
• High-Speed Clearing Performance: Pre-Arc I²t of 1450 and Clearing I²t of 9000 at 1000 V / 11500 at 1250 V for fast, current-limiting response.
• Compact Dimensions: 75 mm length/depth x 59 mm height x 45 mm width, weighing approximately 370 g.
• Watt Losses: Rated at 35 W for predictable thermal performance in the circuit.
• Application-Specific Design: Purpose-built for semiconductor protection duty.
• Contact Design: Supplied without Insulated Metal Gripping Lugs (IMGL) in Standard packaging.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 125 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 9000 at 1000 V, 11500 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: 1450
• Product Height: 59 mm
• Product Length/Depth: 75 mm
• Product Weight: 370 g
• Product Width: 45 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 1250 V
• Voltage Type: AC
• Watt Losses: 35 W

Typical Applications

• Semiconductor Protection Circuits
• High-Speed Power Electronics
• Industrial AC Power Distribution
• Motor Drive and Rectifier Protection Circuits
• Panelboard and Switchgear Installations

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the 170M3442 reflects that with a Class aR rating, IEC rated and CE marked compliance, and documented Pre-Arc and Clearing I²t values for predictable high-speed performance. Its square body, flush-contact construction and defined utilization category (aR) make it a dependable choice for coordinated semiconductor protection in professional electrical installations.