Siemens 52SA2AABK1 Heavy Duty Selector Switch Unit, Water and Oil Tight, 2 Positions, Short Lever, Maintained Operation, A Cam, 1NO Contact Blocks: Electronic Component Selector Switches: Amazon.com: Industrial & Scientific
Amazon.com: Programmable Logic Controller (Plc) Tutorial, Siemens Simatic S7-200: 9780965944687: Stephen P. Tubbs: Industrial & Scientific