electrocube

Somebody else probably has a better idea, the only thing I can thing of, given its location, is a snubber to kill at least some of the spikes when the contacter kicks in and out. I assume the resistor and capacitor are in series on each leg. Would be nice to have a voltage spec on the cap and a power rating on the resistor, though.

Stan

It's called a "snubber" and is used to control contact arcing and burning. I've not seen a three phase brick version, but the single phase blocks are very common in CNC machines.

They usually get put on the contacts of a three phase contactor to supress transent spikes. They usually look like a black cube with a place for bolting them to a surface and have three wires coming out of them. Almost all the contactors in CNC machines have them.

John

John

Electrocube is a manufacturer of film capacitors. They've been around a long time.

Karl already noted that the contents of the cube include a capacitor

*and* a resistor. It is a three phase version of a standard snubber block, not a simple capacitor.