The A3PBF1-600Y-91 is a 2-position momentary flush yellow push button with 1NO+1NC contact configuration. This is the part you'd grab for a panel reset or jog function where a maintained action isn't wanted — press and release, that's it. The flush actuator sits nearly level with the bezel, so it won't snag sleeves or get bumped by passing tools.
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This is a panel-mount push button — the kind you see on control stations, operator consoles, and machine enclosures. The 1NO+1NC contact block gives you one normally-open and one normally-closed set, so you can wire a start signal and a stop signal from the same actuator, or feed both a PLC input and a hardwired safety circuit. The yellow color typically marks a specific function like 'cycle start' or 'reset' on a machine.