Device for starting up of a motor and protective module with cut-off switch of the motor starter

摘要

Embodiments of a combination motor starting device and protector module including a motor start winding cut-out switch for an electric motor are described. In the one embodiment, the motor protector includes a heater element and a bimetallic protector switch, electrically connected in series and configured to be coupled between a power source and the motor windings. The bimetallic protector switch includes a stationary contact, a movable contact, and a bimetal element, responsive to current flow through the protector, controls movements of the movable contact. The heater element is positioned in heat transfer relationship with the protector bimetal element. The motor starting device, in one form, is a positive temperature coefficient resistor (PTCR) element configured to be connected in circuit with the motor start winding. A bimetallic cut-out switch is connected in series with the PTCR. The bimetallic cut-out switch includes a movable conducting element and a bimetal element controls movement of the movable conducting element. The bimetal element of the cut-out switch is positioned in heat transfer relationship with the above described heater element.