Siemens 50AA3C3 Surface Enclosure, 3 Position Selector Switch, "HAND-OFF-AUTO" Labeled, 2 NO Contact Block

This Siemens 50AA3C3 surface- enclosure has a three-position selector actuator, holder, and contact block. The enclosure has M20 threaded electrical conduit ing holes at the top and bottom of the enclosure for electrical wiring and the cover plate label reads "HAND-OFF-AUTO". The twist knob selector actuates two normally open (NO), single-pole, single-throw (SPST) contacts for selective operation. The contact block is rated at up to 600V and up to 30 amp for up to 3,600W power input. The enameled steel enclosure is corrosion-resistant and meets the National Electrical Manufacturers Association (NEMA) 1B standard for protection against dust. This enclosure and pushbutton unit are suitable for use in applications such as manufacturing process control systems. SpecificationsEnclosure typeEnameled steel, M20 conduit , "HAND-OFF-AUTO" cover plate labelPushbutton typeThree-position twist knob selector, holder, and contact blockPower inputUp to 600V, up to 30 amp, up to 3,600WContact type2 NO, SPSTWiring typeScrew-type terminalsDegree of protectionNEMA 1 Pushbutton switches make or break electrical connections as part of a system that controls a process, such as a manufacturing line. Indicator lights with labels or color-coded caps are used to display the current state of a process, such as "completed." The pushbutton unit is composed of a pushbutton actuator for making or breaking electrical connections, a holder for securing the actuator to a control panel and for housing a light, and one or more contact blocks for connection to electrical wiring. Contacts within a contact block can be normally open (NO) or normally closed (NC), so that pressing the button starts or stops a process. Holders accommodate a range of control panel thicknesses and may include lamps to illuminate the button. Pushbutton actuator head types include mushroom, flat-surface, raised-surface, and key-operated, and may be illuminated, color-coded, and labeled. According to the requirements of an application, actuators may operate only as long as the button is held or they may lock into position when pushed and unlock when pulled or twisted. Pushbuttons and indicator lights are used in applications such as manufacturing process controls and as emergency shutoffs in industrial workplaces. Siemens manufactures electronic products for building automation, industrial drives, lighting, energy generation, medical equipment, and rail transportation. The company, founded in 1847 and headquartered in Munich, Germany, meets International Standards Organization (ISO) standards 14001, 9001 and TS 16949.

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• Surface- enclosure with Siemens 3SB3 series three-position twist knob actuator unit for maintained operation.
• 2 NO, SPST contacts with twist-to-select selector switch.
• Up to 600V, up to 30 amp, up to 3,600W power input.
• Enclosure cover label reads "HAND-OFF-AUTO".
• Meets NEMA 1 standard for protection against dust.