Bussmann 170M4418 Eaton series high speed square body fuse, 700V (UL), 690V (IEC), 800A, 200 kAIC, Top fuse status indicator, Fuse, Class aR, Flush

Yes, that's what it's built for. The 170M4418 is a Class aR high speed square body fuse rated for semiconductor protection, utilization category aR (accompanied semiconductor protection). aR means it protects the semiconductor against short circuit only and expects an upstream or companion device to handle overload, so it belongs in series with a drive's diodes, SCRs or IGBTs, not as the sole overcurrent device for a feeder.

The 170M4418 is an 800 A fuse rated 700 V under UL and 690 V AC under IEC, so a 600 V AC drive or rectifier is within rating. It's an AC rated part; don't apply it as a DC fuse on that voltage figure. Interrupting rating is 200 kAIC, which covers high available fault current at the service or drive input.

It's a flush end contact square body fuse, mounted flush, with no insulated metal gripping lugs (IMGL). The flat end contacts bolt directly to busbar or to a flush style base. If your existing assembly uses an IMGL or blade/lug pattern fuse, this one will not drop in, you need the matching IMGL version of the 170M series instead.

For the 170M4418, pre arc (melting) I2t is 105,000 A2s and clearing I2t is 725,000 A2s at 660 V. Compare the clearing figure against the I2t withstand rating of the diode or thyristor you are protecting, the device must be able to absorb more than the fuse lets through. Watt loss at rated current is 95 W, which is what you budget for cabinet heat rise.

No. The 170M4418 is a Class aR high speed semiconductor fuse for short circuit protection of solid state devices, not a branch circuit fuse, and it does not give the overload protection a Class J or Class T fuse provides. Use it only where the drive or converter manufacturer specifies a high speed aR fuse, and keep a proper branch circuit device upstream.

Body dimensions are 107 x 53 x 63 mm (length 107 mm, width 53 mm, height 63 mm) and it weighs about 383 g. Check the 63 mm height against the clearance inside your drive cabinet or fuse compartment before ordering, since square body fuses in this size class sit proud of the busbar.

Yes. The 170M4418 has a top mounted fuse status indicator, so an operating element that pops or changes state on the top face of the fuse tells you it has cleared without pulling the fuse or metering it. The indicator faces up, so leave sight access above the fuse when you lay out the assembly. It can also drive a microswitch arrangement where the base supports one.

It is UL Recognized and CE Marked. That makes it usable as a recognized component inside a listed assembly, evaluated under the UL 700 V rating rather than as a standalone listed device.

Yes, 170M4418 is the genuine Bussmann (Eaton) catalog number for this 800 A, 690 V IEC / 700 V UL square body aR fuse with flush contacts and top indicator. The 170M series numbers change with body size, amp rating and contact style, so order by the full number rather than by rating alone.