On Jul 8, 2:24*pm, alphamnemonic wrote:
Hi

The device in question is a radial disc with diameter ~ 22mm. It is
marked "SG403". I suspect it is a PTC, but I would like to be sure and
also figure out the specs. Any advice on PTC selection for motor
protection applications would also be appreciated. The motor to which
this component is connected has a cut-in current of 42A and a max run
current of 7A. Thanks!

It's an RTI "Surge-Gard" NTC thermistor, but I haven't found any specs
yet...