Specialty safety switches are specialized or proprietary products and accessories related to safety sensors and switches. There are several types of specialty safety switches. Examples include interlock safety systems, safety key switches, and non-contact interlock safety switches. An interlock safety system is a strong control system that provides protection to personnel, equipments and plants. Safety key switches are another type of specialty safety switch that uses a key as activation source. A non-contact interlock safety switch is used to detect the opening of guards-including doors, gates and/or removable covers-that prevent access to dangerous parts of a machine, and to help deter tampering with the guards or the internal machine controls. Other specialty safety switches are commonly available.