The A3PBF1-600L-11 is a 2-position momentary flush blue push button with one normally open and one normally closed contact block. The flush actuator sits nearly flush with the panel surface, reducing snag risk on control stations where operators brush past.
The 1NO+1NC contact arrangement gives a self-monitoring pair for safety circuits: the NC channel breaks on actuation, the NO channel makes, so a stuck-contact fault appears as a mismatch on the safety relay. Spring-cage terminals accept 0.2–2.5 mm² solid or ferruled stranded — strip length 8 mm avoids whiskers under the cage.