Characteristics 1NO + 1 NC , 1NO + 1 NC, 2 NO + 2 NC contacts. Silver contacts are designed for low contact resistance. Long mechanical & electrical life. Robust contect springs. Can be oprated at frequencies as 3000 switching cycleshr. Available in open execution or in aluminum alloy diecast housing. Roller Lever switches can be operated from 4 direction in step of 90ยบ. Snap action limit switches are designed for extremely low operating speeds. Switch elements with a cover are also available. Conform to IEC 947-5-1 standard.