Newmar Selector Switch 3.0KW Transfer Switch 023-2203-0An Ac source selector switch is an essential item for any boat with an on-board AC generator and/or inverter. The switch eliminates the safety hazard and/or damage that can occur if two AC sources are applied to the same circuit simultaneously. These switches are fitted with a compact escutcheon plate with engraved switch position nomenclature (mounting dimensions below). The switches carry UL, CSA and VDE approval and feature heavy duty contacts and a positive step cam mechanism for low resistance contact closure. May be installed in panel with thickness up to 1/4″.