Siemens 52C156A Heavy Duty Selector Switch Control Station, 3 Positions, Water and Oil Tight, 1 Command Points, Hand-Off-AUTO" Labeled, NEMA 12 Protection, 1NO-1NC Contact Types

This Siemens 52C156A enclosure and selector switch has a three-position selector knob, holder, and contact block, and is suitable for use in wet or oily environments. The inscription plate reads "HAND-OFF-AUTO". The selector knob actuates a normally open (NO) contact and a normally closed (NC) contact for maintained operation. The contact block is rated at up to 600V and up to 7,200W power input. This metal enclosure meets the National Electrical Manufacturers Association (NEMA) type 12 standard for protection against dust and liquids. This enclosure and pushbutton unit is suitable for use in applications such as selecting an electrical circuit in a hazardous location in a manufacturing process control system.

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.

• Enclosure with three-position selector switch unit for controlling an electrical circuit in a wet or oily environment.
• 1 NO + 1 NC contacts for maintained operation.
• Up to 600V, up to 7,200W power input.
• Inscription plate legend reads "HAND-OFF-AUTO ".
• Meets NEMA type 12 standard for protection against dust and liquids, indoor use.