Bussmann 170M4691 Class aR High Speed Fuse, 315A

Bussmann 170M4691 Class aR High Speed Fuse, 315A

The Bussmann 170M4691 is a Class aR high speed fuse rated 315A RMS at 1000V AC (IEC), built in a square body US-style construction (-FU/115) without an indicator for semiconductor-level overcurrent protection. With a 100 kAIC interrupt rating and fast-clearing time-current characteristics, this fuse is engineered to protect power semiconductors in DC common bus systems, DC drives, power converters/rectifiers, and reduced voltage starters. It carries UL Recognized, IEC Rated, and CSA Certified marks, plus CE marking and RoHS compliance, for use in professional industrial power electronics installations.

Key Features

• Current Rating: 315A RMS for dependable overcurrent protection in demanding power circuits.
• Class aR Design: High speed fuse construction optimized for semiconductor protection applications.
• Voltage Rating: 1000V AC (IEC) rated for high-voltage DC drive and power converter circuits.
• Interrupt Rating: 100 kAIC delivers high fault-current interrupting capacity for critical circuits.
• Fuse Body: Square body US style (-FU/115), Non Indicating fuse configuration.
• I²t Characteristics: Pre-Arc I²t of 7750; Clearing I²t of 90000 at 1000V and 120000 at 1250V for fast semiconductor-grade clearing.
• Watt Losses: 65W.
• Application: Designed for DC common bus, DC drives, power converters/rectifiers, and reduced voltage starters.

Certifications & Compliance

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

Technical Specifications

• Amperage Rating: 315A
• Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
• Class: Class aR
• Clearing I²t: Clearing at 1000V: 90000, Clearing at 1250V: 120000
• Current Rating: 315A RMS
• Fuse Indicator: Non Indicating
• Interrupt Rating: 100 kAIC
• Packaging Type: Standard
• Pre Arc I²t: 7750
• Voltage Rating: 1000 Vac (IEC)
• Watt Losses: 65W
• Product Type: Square body US style, -FU/115 without indicator
• Product Length: 5.433 IN
• Product Height: 2.087 IN
• Product Width: .315 IN
• Product Weight: 1.6456 LB

Typical Applications

• DC Common Bus Systems
• DC Drive Overcurrent Protection
• Power Converters and Rectifiers
• Reduced Voltage Starters
• Industrial Motor Control and Power Electronics

Why Bussmann?

Bussmann fuses are built for demanding industrial power electronics, and the 170M4691 is no exception, combining a Class aR high speed design with a 100 kAIC interrupt rating and fast Pre-Arc/Clearing I²t performance for semiconductor protection. Backed by UL Recognized, IEC Rated, and CSA Certified marks along with CE and RoHS compliance, it delivers the reliable, code-compliant overcurrent protection professionals expect for DC drives, power converters, and reduced voltage starter circuits.