Eaton NSB E34EX723BK Selector Switches 2 Position

The Eaton NSB E34EX723BK is a black, two-position selector switch from the NSB line designed for industrial control applications. It features four internal contacts arranged as two normally open (NO) and two normally closed (NC) contacts, giving 2NO 2NC in a single device. In operation, the switch toggles between two states, altering the connection pattern to provide two distinct circuit configurations controlled from one handle. This configuration enables wiring two separate circuits or functions with both NO and NC contact paths, which can be used to create simple control logic or interlock-style sequences within a control panel. The compact form factor of the NSB E34EX723BK makes it suitable for panel mounting where a robust, mechanical selector is needed to indicate and enforce a chosen operating mode. The black housing provides high-contrast visibility in enclosure interiors, aiding quick recognition of the current switch position during routine checks.