Die cast aluminum alloy shell, powder coating, beautiful appearance, reliable quality, switch position can be clearly identified by indicator. Quick positioning cam, installed through spline shaft and spring, can be easily adjusted without tools, with a multi contact terminal block and 8 standard contacts. Wiring is safe and convenient. Standard wire interface, anti loosening bolts, bolts attached to the upper cover during disassembly and assembly will not fall off, easy to install. The stainless steel spindle connection part and installation bracket comply with NAMUR standards.