Visible blade heavy duty safety switches are designed for application where maximum performance and continuity of service are required. All heavy duty safety switches feature quick-make, quick-break operating mechanism, a dual cover interlock and a color coded indicator handle. They are suitable for use as service equipment when equipped with a field- or factory installed neutral assembly or equipment grounding kit, unless a 600Y/347 VAC or 480 Y/277 VAV, 1000 A or greater, solidly grounded WYE system is used.