SmartLock slide retainer and limit switch is designed for injection molders to provide switching plus slide retaining in one unique package.The SMARTLOCK locking function prevents premature slide movement during molded part ejection while the SPDT switch is simultaneously actuated. The SMARTLOCK slide retainer and limit switch has been tested for reliability over 10 million cycles without failure. Two or more switches may be used for larger molds, or molds with multiple slides. Increased safety and prevention of mold damage result when the SMARTLOCK slide retainer and limit switch is installed in a mold. A capture screw holds the pluger in place.