Bussmann 170M4519 Class aR Square Body High Speed Fuse, 900A

Bussmann 170M4519 Class aR Square Body High Speed Fuse, 900A

The Bussmann 170M4519 Class aR Square Body High Speed Fuse delivers fast-clearing overcurrent protection engineered for demanding DC power electronics. Rated 900A (900A RMS) with a voltage rating of 700 Vac (UL) / 550 Vac (IEC) and a 200 kAIC interrupt rating, this Class aR fuse is purpose-built for DC common bus, DC drives, and power converter/rectifier applications where high fault-current clearing and tight I2t coordination are critical. The square body design is UL Recognized and IEC Rated, giving specifying engineers and panel builders a dependable, code-aware protection component for industrial DC power systems.

Key Features

• Amperage Rating: 900A (900A RMS) supports high-capacity DC circuit protection in demanding power electronics.
• Voltage Rating: 700 Vac (UL) / 550 Vac (IEC) allows use across both UL- and IEC-rated system designs.
• Class aR Construction: Square body high speed fuse design purpose-built for semiconductor and power converter protection.
• Interrupt Rating: 200 kAIC delivers dependable clearing performance under high fault-current conditions.
• Application: Engineered for DC common bus, DC drives, and power converters/rectifiers.
• I2t Performance: Pre-arc I2t of 155000 and clearing I2t of 850000 at 660V for coordinated fast-acting protection.
• Fuse Indicator: Non-Indicating design.
• Watt Losses: 100W rated power dissipation.
• Mounting Method: Flush mounting configuration.

Certifications & Compliance

• UL Recognized
• IEC Rated
• CE Marked
• RoHS Compliant

Technical Specifications

• Amperage Rating: 900A
• Application: DC common bus, DC drives, power converters/rectifiers
• Class: Class aR
• Clearing I2t: Clearing at 660V: 850000
• Current Rating: 900A RMS
• Fuse Indicator: Non Indicating
• Interrupt Rating: 200 kAIC
• Packaging Type: Standard
• Pre Arc I2t: 155000
• Voltage Rating: 700 Vac (UL), 550 Vac (IEC)
• Watt Losses: 100W
• Product Type: Square body -BKN/- type K indicator for micro
• Product Length: 5.433 IN
• Product Details: Square body -BKN/- type K indicator for micro
• Mounting Method: Flush
• Product Height: 2.087 IN
• Product Weight: 1.6456 LB
• Product Width: .315 IN

Typical Applications

• DC Common Bus Protection
• DC Drive Systems
• Power Converters and Rectifiers
• Industrial DC Power Distribution Systems

Why Bussmann?

Bussmann engineers the 170M4519 Class aR high speed fuse to meet the fast clearing speeds and high fault-current levels required in DC drive and power conversion systems. Backed by UL Recognized and IEC Rated listings, plus CE marking and RoHS compliance, this square body fuse gives electrical professionals a dependable, code-aware overcurrent protection component for industrial DC power electronics installations.