Electric motor controlling relay

摘要

A thermistor sandwich assembly connectable for controlling motor starting windings is enclosed in a relatively thin and conforming case. The sandwich assembly includes a contact plate abutting the case lower wall with plate integral spring fingers against a face of a wafer-like thermistor, another contact plate overlying and having downward projections against the other thermistor face as well as abutting the upper case wall. A plurality of holes in the lower case wall and a bus bar slot through the upper case wall permit air circulation through the case and between the contact plates and thermistor faces for cooling the thermistor, the relay being otherwise free of cooling plates. A bus bar is rigidly connected extending partially through the case bus bar slot in electrical connection with the thermistor sandwich assembly normally transmitting electrical energy to a contact plate but selectively severable or removable to permit addition of capacitance in the electrical circuit.