Bussmann 170M4459 Eaton Series High-Speed Square Body Fuse, Class aR, 250A

Bussmann 170M4459 Eaton Series High-Speed Square Body Fuse, Class aR, 250A

The Bussmann 170M4459 is an Eaton series high-speed square body fuse for semiconductor protection, rated 1300V (UL) and 1250V (IEC) with a 690V AC voltage rating, 250A amperage rating, and 200 kAIC interrupting rating. Built to Class aR utilization for accompanied semiconductor protection, it features flush end contacts for reliable connection in high-speed switching applications. The fuse is IEC rated and CE marked for dependable overcurrent protection in power electronics circuits.

Key Features

• Compact Square Body Design: Measures 107 mm in length/depth, 63 mm in height, and 53 mm in width with flush end contacts for space-efficient panel and bus bar mounting.
• Class aR Utilization: Classified aR (accompanied) for semiconductor protection, engineered to work alongside other overcurrent devices in coordinated protection schemes.
• High Voltage Rating: Rated 1300V (UL), 1250V (IEC), and 690V AC for use in demanding medium-voltage semiconductor circuits.
• 250A Amperage Rating: Delivers 250A continuous current handling for high-speed fuse protection duty.
• 200 kAIC Interrupting Rating: High interrupting capacity supports safe clearing of high fault currents.
• Fast-Clearing Performance: Pre-arc I2t of 3100 and clearing I2t of 21000 at 660V for fast, predictable current-limiting response.
• Low Watt Losses: Rated at 55W watt losses for efficient thermal performance in continuous duty.
• Standard Packaging: Supplied in standard packaging without insulated metal gripping lugs (IMGL).

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 250 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 21000 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: 3100
• Product Height: 63 mm
• Product Length Depth: 107 mm
• Product Weight: 393.6666667 g
• Product Width: 53 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 690 V
• Voltage Type: AC
• Watt Losses: 55 W

Typical Applications

• Semiconductor Device Protection
• Power Electronics and Drive Circuits
• High-Speed Fuse Coordination Schemes
• Industrial Power Conversion Equipment
• Medium-Voltage Electrical Systems

Why Bussmann?

Bussmann by Eaton is a trusted name in circuit protection, and the 170M4459 high-speed square body fuse reflects that standard with its Class aR utilization, 200 kAIC interrupting rating, and IEC rated, CE marked construction. Electrical professionals rely on Bussmann fuses for consistent, code-compliant performance in semiconductor and power electronics protection applications.