The ABB A3PBF1-6007-91 is a 2-position momentary flush push button with one normally open and one normally closed contact (1NO+1NC). This is a panel-mount control device for momentary switching actions — press to actuate, release to return — in industrial control stations, operator panels, and machine enclosures.
The 1NO+1NC contact configuration gives you one set of normally open and one normally closed contacts in a single device. For a flush-mount momentary push button, the NO contact closes when pressed and opens on release — used for a start or enable signal — while the NC contact opens on press and closes on release, typically wired as a stop or interlock in a safety circuit. The flush actuator sits level with the panel face, reducing accidental actuation in a crowded operator station.