circuit has been described by way of example and it will be understood that other circuits may be used in plug in starting aids embodying the invention in the preferred embodiment of the invention illustrated in fig1 starting aid 5 has a rectangular open frame 13 made of a plastic suitable for molding one plastic which we have used is polybutylene terephthalate which is available from general electric company under the designation valox 325 another suitable plastic material which is cheaper is fiber glass filled polypropylene prior to molding choke 7 and resistor 8 are joined and together with capacitor 6 and sidac 9 have terminal connectors 15 16 and 17 fastened to their lower ends while their upper ends are joined together through a connector strip 18 the parts are arranged to stand within the frame window and extend in the manner illustrated between the base portion 14 and the top portion 27 of the frame the frame is molded around the root ends of the terminal connectors 15 16 and 17 and completely around connector strip 18 these terminals and the connector strip are thus encased in plastic and protected thereby from environmental contaminants the base portion 14 of starting aid frame 13 is provided with three dependent legs 19 20 and 21 the center leg 20 is a thicker guide leg assuring alignment when inserted into slot 20 39 in connector block 23 the outer two legs 19 and 21 are thinner but penetrate slots 19 39 and 21 39 of the same width as slot 20 39 the thinner outer legs.