Bussmann 170M4414 Eaton High-Speed Square Body Fuse, Class aR, 500A

Bussmann 170M4414 Eaton High-Speed Square Body Fuse, Class aR, 500A

The Bussmann 170M4414 is an Eaton Bussmann series high-speed square body fuse engineered for semiconductor protection in demanding industrial power circuits. Rated 700V (UL) / 690V (IEC) AC and 500A with a 200 kAIC interrupt rating, this Class aR fuse features a square body design with flush end contacts and a top fuse status indicator for quick, at-a-glance condition checks. Its high-speed, current-limiting design and defined let-through energy make it well suited for coordinated protection of semiconductor devices such as SCRs, diodes, and power modules against short-circuit fault currents.

Key Features

• Amperage Rating: 500A rating supports high-current semiconductor protection applications.
• Voltage Rating: 700V (UL) / 690V (IEC) AC voltage rating for use in high-voltage industrial power systems.
• Interrupt Rating: 200 kAIC interrupt capacity for reliable performance under high fault-current conditions.
• Utilization Category: Class aR (accompanied semiconductor protection) for coordinated protection of semiconductor devices.
• Fuse Shape: Square body construction with flush end contacts for a compact, flush-mount installation.
• Top Fuse Status Indicator: Visual indicator on top of the fuse body for fast, easy verification of fuse condition.
• Let-Through Energy: Pre-arc I2t of 25,000 A²s and clearing I2t of 170,000 A²s at 660V for precise coordination with protected semiconductor components.
• Watt Losses: 72W power loss rating.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 500 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 170000 at 660 V
• Compliances: CE Marked
• Fuse Shape: Square body, flush end contacts
• Insulated Metal Gripping Lugs (IMGL): No
• Packaging Type: Standard
• Pre Arc I2t: 25000
• Product Height: 63 mm
• Product Length Depth: 107 mm
• Product Weight: 381.6666667 g
• Product Width: 53 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 690 V
• Voltage Type: AC
• Watt Losses: 72 W

Typical Applications

• Semiconductor Protection Circuits
• Power Conversion and Rectifier Equipment
• Variable Frequency Drives
• Industrial Motor Control Systems
• High-Power Industrial Electrical Distribution

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the 170M4414 reflects that standard with a high-speed, current-limiting design built specifically for semiconductor protection. With a 200 kAIC interrupt rating, Class aR utilization category, and IEC-rated, CE-marked construction, this fuse delivers dependable, code-compliant performance for professional industrial power applications where protecting sensitive semiconductor components is critical.