The R-27 R-27 1st OP L 639 SS Limit Switch is an industrial limit switch used to detect a defined mechanical position within automation equipment. The device is identified by the markings R-27, 1st OP, L 639 SS, which help technicians match replacements or retrofits in legacy R-27 installations. In operation, it provides a signal to the control system when the actuated mechanism reaches the programmed position.
