This Siemens 52SA2ACB heavy duty selector switch is a non-illuminated knob operator with white insert for a pilot device. It is made of chrome for hardness and resistance to corrosion. It has momentary operation and a spring return from the right. It has a Class 52 water and oil-tight rating for long life in demanding industrial applications and meets National Electrical Manufacturer Association (NEMA) Type 3, 4, 4X, 12, and 13 specifications. This selector switch is Underwriters Laboratories (UL) listed, Canadian Standards Association (CSA) certified.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.