Bussmann 170M7978 Class aR 1800A/1250V Semiconductor Fuse, 4SBKN/105The Bussmann 170M7978 is a Class aR semiconductor protection fuse rated 1800A at 1250V AC, built to the 4SBKN/105 manufacturer designation for demanding power electronics applications. As an aR utilization category fuse, it is designed for accompanied semiconductor protection and backed by a 125 kAIC interrupt rating with flush mounting for panel integration. It is IEC Rated and CE Marked, reflecting compliance with recognized international standards for industrial fuse performance.Key FeaturesRated Configuration: 1800A at 1250V AC under manufacturer designation 4SBKN/105.Utilization Category: Class aR (accompanied semiconductor protection), engineered to protect semiconductor devices from overcurrent.Interrupt Rating: 125 kAIC for reliable current-limiting performance under high fault-current conditions.Mounting Method: Flush mounting for compact, space-efficient panel integration.Watt Losses: 260 W rated power dissipation.Application: Purpose-built for semiconductor protection in power conversion equipment.Certifications & ComplianceIEC RatedCE MarkedTechnical SpecificationsAmperage Rating: 2500 AApplication: semiconductor protectionCertifications: IEC RatedClass: Class aRClearing I2t: 28000000 at 1250 VCompliances: CE MarkedFuse Indicator: OtherInsulated Metal Gripping Lugs (IMGL): NoInterrupt Rating: 125 kAICMounting Method: FlushPackaging Type: StandardPre Arc I2t: 4500000Product Height: .001 mmProduct Length Depth: .001 mmProduct Weight: .001 gProduct Width: .001 mmUtilization Category: aR (accompanied semiconductor protection)Voltage Rating: 1250 VVoltage Type: ACWatt Losses: 260 WTypical ApplicationsSemiconductor Protection in Power ElectronicsVariable Frequency Drives and Motor ControlsRectifier and Power Conversion EquipmentIndustrial Switchgear and PanelboardsHigh Fault-Current Industrial SystemsWhy Bussmann?Bussmann fuses are engineered for dependable overcurrent protection in demanding industrial environments. The 170M7978 Class aR fuse is IEC Rated and CE Marked, with a 125 kAIC interrupt rating that supports code-compliant performance for semiconductor protection applications. Choose Bussmann for consistent, professional-grade electrical protection.