Bussmann 170M4972 Eaton series high speed square body fuse, 700V (UL), 690V (IEC), 500A, 150 kAIC, Other, Fuse, Class aR, DIN 43 620 - 170M4972

Yes. The 170M4972 uses the DIN 43 620 mounting pattern with a square body and slotted, center bolted tags, so it bolts into standard DIN 43 620 holders and busbar mounts. Check the slot centers on your existing base against the fuse before torquing anything down, since the body measures 245 x 142 x 62 mm.

No, not on its own. Class aR is a partial range, accompanied semiconductor protection fuse: it clears high fault currents fast to protect diodes, SCRs and IGBTs, but it does not cover low level overloads. You need a separate overload device (drive electronic overload, thermal overload relay, or a breaker) in series with it. If you want a fuse that handles the full range including overloads, that is a gR type, not this one.

The 170M4972 is rated 500 A with a 150 kAIC interrupting rating, which covers most industrial drive and rectifier bus arrangements. Compare that figure against the available fault current calculated at the point of installation; the fuse interrupting rating must equal or exceed it.

Pre-arcing (melting) I2t is 63000 A2s and clearing I2t is 375000 at 1000 V. Your semiconductor's published I2t withstand has to be greater than the fuse clearing I2t at your operating voltage, otherwise the device fails before the fuse does. That comparison is the whole point of specifying an aR fuse rather than a general purpose one.

Watt loss is 85 W at rating. Budget that per fuse when you size enclosure ventilation or a cooling fan, and remember a three phase set of three puts roughly 255 W into the cabinet. Derating applies if the holder is in still air or the ambient runs hot.

No. The 170M4972 is supplied without insulated metal gripping lugs (IMGL). It is a bolted tag fuse, so you remove and replace it with the circuit de-energized and locked out, using the bolt connections to the base.

It is IEC rated and CE marked, which is what a panel builder shipping into Europe needs on the fuse line of the bill of materials. It is an AC device, so it is specified for AC circuit duty.

The part is Bussmann 170M4972, a genuine Eaton Bussmann 500 A Class aR high speed square body fuse on the DIN 43 620 mount. Match that full number on the label of the fuse you are pulling out; the 170M family uses closely related numbers across amp ratings and body sizes, so a single digit difference is a different amp rating or a different body length.

Body dimensions are 245 mm length, 142 mm width and 62 mm height, at about 218 g. Those numbers matter when you are laying out a three pole fuse block inside a drive cabinet, since the 142 mm dimension drives phase to phase spacing and the 62 mm drives door clearance.