Bussmann 170M5208 High Speed Square Body Fuse, Class aR, 400AThe Bussmann 170M5208 is an Eaton Bussmann series high speed square body fuse engineered for semiconductor protection in demanding power electronic circuits. Rated 1250V (IEC) / 1300V (UL) with a 400A amperage rating and a 200 kAIC interrupting rating, this Class aR fuse is built to DIN 43 620 dimensions with blade end x blade end connections for reliable installation in high-speed fuse holders. A top fuse status indicator allows for quick visual confirmation of fuse condition, helping maintenance teams identify a blown fuse without removing it from service.Key FeaturesAmperage Rating: 400A for high-current semiconductor circuit protection.Voltage Rating: 1250V (IEC) / 1300V (UL), with a 690V AC voltage rating listed for the fuse element.Interrupting Rating: 200 kAIC for dependable clearing performance under high fault-current conditions.Utilization Category: Class aR (accompanied semiconductor protection) for coordinated protection of power semiconductors.Fuse Shape: Square body with slotted center bolted tags for secure blade end x blade end mounting.Status Indicator: Top fuse status indicator for fast visual confirmation of fuse condition.Standard: Constructed to DIN 43 620 dimensional standard for compatibility with standard high-speed fuse holders.Certifications & ComplianceUL RecognizedCE MarkedTechnical SpecificationsAmperage Rating: 400 AApplication: semiconductor protectionCertifications: UL RecognizedClearing I2t: 74000 at 660 VClearing Loss: 130Compliances: CE MarkedFuse Shape: Square body, slotted center bolted tagsInsulated Metal Gripping Lugs (IMGL): NoPackaging Type: StandardPre Arc I2t: 1100Product Height: 66 mmProduct Length Depth: 286 mmProduct Weight: 622.6666667 gProduct Width: 165 mmUtilization Category: aR (accompanied semiconductor protection)Voltage Rating: 690 VVoltage Type: ACTypical ApplicationsSemiconductor Protection in Power Electronic CircuitsHigh-Speed Fault Current InterruptionVariable Frequency Drives and Rectifier SystemsIndustrial Power Electronic EquipmentCoordinated Protection Ahead of Power SemiconductorsWhy Bussmann?Bussmann by Eaton is a recognized name in circuit protection, and the 170M5208 reflects that standard with a Class aR, DIN 43 620 square body construction rated for 400A and 200 kAIC. Its UL Recognized and CE Marked compliance, combined with a top fuse status indicator, supports code-compliant, serviceable protection for semiconductor and power electronic applications where reliable high-speed interruption is essential.