Bussmann 170M3390 Eaton series high speed square body fuse, 700V (UL), 690V (IEC), 80A, 100 kAIC, Other, Fuse, Class aR, Flush - 170M3390

That is exactly what it is built for. The 170M3390 is a Class aR high speed fuse with utilization category aR, accompanied semiconductor protection, so it is intended to work alongside another protective device that handles overload while the fuse clears short circuit faults on semiconductors such as diodes, SCRs and IGBTs. It is not a general purpose branch circuit fuse and should not be used as the sole overload protection for a motor circuit.

Plan the mounting around a body measuring 96 x 170 x 50 mm, with flush end contacts and flush mounting. Flush contacts bolt directly to bus bar or to a square body base rated for that centre spacing, so confirm your existing base is a flush type and not a blade or DIN style before ordering. The fuse weighs 202 g, light enough that the bus bar connection carries it without extra support.

The 170M3390 is an 80 A fuse with a 100 kAIC interrupting rating on AC. That interrupting figure is what matters on a drive input fed from a stiff service: as long as the available fault current at the fuse terminals is below 100 kA, the fuse can clear it safely.

Melting (pre-arc) I2t is 420, and total clearing I2t is 2500 at 1000 V and 3350 at 1250 V. Compare the clearing value at your actual working voltage against the I2t withstand of the diode, SCR or IGBT module being protected; the device rating must be the larger of the two for the fuse to save it. Note that clearing energy climbs as applied voltage rises, which is why the two figures differ.

Not for the same duty. Class J and RK5 fuses are branch circuit and general purpose devices; the 170M3390 is a high speed square body fuse in Class aR, which clears far faster and with much lower let-through energy so a semiconductor survives the fault. Substituting a conventional fuse in a drive or rectifier means the power device fails before the fuse does. Match the replacement on class (aR), amperage (80 A) and the flush square body form factor.

Rated watt loss is 25 W at full load. Two or three of these in a three phase set adds 50 to 75 W inside the cabinet, which is worth adding to your thermal calculation when you size enclosure ventilation or check the derating of neighbouring components. Mounting it in free moving air on bus bar helps carry that heat away.

No. The 170M3390 is supplied without insulated metal gripping lugs (IMGL), so it has to be handled by the body and the panel de-energized before the fuse is unbolted. If your maintenance procedure relies on gripping lugs for changeouts, specify an IMGL version of the square body fuse instead.

It is UL Recognized and CE Marked. UL Recognition means it is accepted as a component inside listed equipment rather than as a standalone listed device, and the CE marking covers machinery and panels shipped into the EU. Both marks on the same part number keeps a single fuse in the bill of materials for domestic and export builds.

Order by manufacturer part number 170M3390. That number is the Eaton Bussmann series designation for this 80 A high speed square body fuse, and it is the only identifier you need on a purchase order or a panel drawing.