Part identity and function
The Siemens 3RA9012-5BK36 is a pushbutton unit for motor starter assemblies, specified as a GM-SET / ITEM NUMBER 12265 with a black mushroom head actuator, one normally open (1NO) contact, and cage clamp connection terminals. This component sits within the Siemens Motor Starters category and is used as a local control station for starting, stopping, or emergency-stop functions on motor control circuits.
Lifecycle and sourcing posture
Siemens is the manufacturer.
Integration notes for panel builders
The cage clamp connection accepts solid or stranded conductors without requiring ferrules, reducing wiring time in control panel assembly. The 1NO contact configuration suits momentary-start or reset functions in a motor starter circuit. The black mushroom head provides a tactile emergency-stop actuator that meets typical machine-guarding requirements when paired with a positive-opening contact block (not included in this assembly).