Bussmann 170M8543 Class aR High Speed Fuse, 1250A, 150kAIC

Bussmann 170M8543 Class aR High Speed Fuse, 1250A, 150kAIC

The Bussmann 170M8543 is a Class aR high speed fuse engineered for demanding semiconductor and power electronics protection, rated 1250A RMS with a 150 kAIC interrupt rating for reliable operation in high fault-current environments. Its square body US-style construction includes a -FKE/115 type K indicator for micro switch compatibility, and the fuse supports applications such as DC common bus systems, DC drives, power converters/rectifiers, and reduced voltage starters. This non-indicating fuse is CE Marked, RoHS Compliant, IEC Rated, and UL Recognized for use in professional industrial power systems.

Key Features

• Amperage Rating: 1250A RMS current rating delivers robust protection for high-power DC and power conversion circuits.
• Class aR Design: Purpose-built high speed fuse class engineered for semiconductor and rectifier short-circuit protection.
• Interrupt Rating: 150 kAIC interrupt rating provides dependable performance under high fault-current conditions.
• Square Body Construction: US-style square body with -FKE/115 type K indicator for micro switch compatibility.
• Fuse Indicator: Non-Indicating design for standard installations without a blown-fuse indicator.
• Watt Losses: 175W power dissipation rating supports accurate system thermal design.
• Let-Through Energy: Pre-Arc I2t of 575000 and Clearing I2t at 1000V of 3400000 support precise coordination with upstream and downstream devices.

Certifications & Compliance

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

Technical Specifications

• Amperage Rating: 1250A
• Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
• Class: Class aR
• Clearing I2t: Clearing at 1000V: 3400000
• Current Rating: 1250A RMS
• Fuse Indicator: Non Indicating
• Interrupt Rating: 150 kAIC
• Packaging Type: Standard
• Pre Arc I2t: 575000
• Watt Losses: 175W
• Product Type: Square body US style, -FKE/115 type K indicator for micro
• Product Length: 5.433 IN
• Product Details: Square body US style, -FKE/115 type K indicator for micro
• Product Height: 2.087 IN
• Product Weight: 1.6456 LB
• Product Width: .315 IN

Typical Applications

• DC Common Bus Systems
• DC Drives
• Power Converters
• Rectifiers
• Reduced Voltage Starters

Why Bussmann?

Bussmann engineers the 170M8543 Class aR high speed fuse with a 150 kAIC interrupt rating and CE Marked, RoHS Compliant, IEC Rated, and UL Recognized compliance for dependable, code-compliant protection in demanding industrial power applications. The square body construction and defined Pre-Arc and Clearing I2t characteristics support precise selective coordination, helping electrical professionals protect DC drives, power converters, and rectifier systems with confidence.