Bussmann 170M6663 Eaton series high speed square body fuse, 700V (UL), 690V (IEC), 900A, 200 kAIC, Other, Fuse, Blade end X blade end, Class aR - 170M6663

Yes. The 170M6663 is a Class aR high speed square body fuse rated 690V AC under IEC and 900A, built for semiconductor protection. aR means accompanied semiconductor protection, so it clears short circuits on diodes, SCRs and IGBT stacks but does not provide overload protection on its own. You still need an overload device, typically the drive's electronic trip, in series with it.

It is a square body fuse with center bolted tags, blade end by blade end. That means it bolts directly to busbar or to flush-end mounting pads, not into a clip-style holder. You supply the mounting bolts and washers to suit your bus. There are no insulated metal gripping lugs on this one, so the terminations are bare blades.

Clearing I2t is 670,000 A2s at 660 V and pre-arc (melting) I2t is 100,000 A2s. Your semiconductor's rated I2t withstand must exceed the clearing value at your operating voltage for the device to survive a fault. Use pre-arc I2t when checking selectivity against a downstream fuse.

No. This is a Class aR semiconductor fuse, not a branch circuit protective device. aR fuses only protect in the short circuit range and are not intended to clear sustained overloads, so they cannot stand in for a UL Class J, RK5 or CC fuse where branch circuit protection is required by code. Use it ahead of rectifier and inverter sections, with separate overload protection.

Two different numbers apply. The 170M6663 carries 700V under UL and 690V under IEC. Use the 690V figure when you are working to IEC rules and 700V when the panel is built to UL; the fuse is UL Recognized and CE Marked, so it can go into either build.

Body measures 168 mm length/depth, 95 mm width, and 76 mm height, and it weighs 997 g. At roughly a kilogram, plan the busbar support accordingly rather than letting the fuse hang on thin flexible conductors.

Watt loss is 120 W at rating. That is real heat inside a sealed cabinet, so include it in your thermal load when sizing enclosure ventilation or an air conditioner, and multiply it by the number of poles you are fusing.

Yes, 170M6663 is the genuine Bussmann manufacturer part number for this 900A, 690V aR square body high speed fuse, and it is the only model on the item. Order by that number to avoid pulling a different amp rating from the 170M series, which spans many ratings with similar numbering.