Anywhere that a machine operator interfaces with a machine, robot or process is an ideal application for the Defender. Visibly safer than light curtains, the Defender combines safety interlock switches/controls capable of achieving up to PLe, Category 4 level safety with a movable physical barrier restricting access to dangerous machine movement while at the same time containing process driving hazards such as weld flash/sparks, flying debris, mist, spray and other containment and exposures.