The A3PBE1-600R-91: This is a 2-position momentary pushbutton with an extended red operator and one normally-open plus one normally-closed contact block. The momentary action means the contacts return to their resting state when the button is released — suited for jog, test, or interlock circuits where sustained closure is not desired. The extended operator projects further from the panel face, making it easier to actuate with a gloved hand or through a panel overlay. The 1NO+1NC contact arrangement gives one set of make and one set of break contacts in a single unit, covering both a start and a stop leg in a two-wire control scheme without an additional contact block.
Pushbuttons of this class mount into a standard panel cutout and connect to a control circuit via screw or quick-connect terminals. The extended red operator is common in emergency-stop or manual-reset stations where visibility and reach are priorities. The momentary action keeps the circuit de-energized once the operator is released, which is the expected behavior for a test or acknowledge function in a safety-related control scheme.