Limit Switches Limit Switches LS2 LS3 & LS4 Limit SwitchesABB limit switches are an easy and reliable way to convert mechanical movements into electrical signals. Publications BrochuresCatalogs and Buyers GuidesCertificates/Declarations of Conformity Other Controls & Protective Relays Limit Switches Time Relays Economic & DIN Rail Range Power Supplies Previous Generation Relays, Timers & Control High Performance & Buffer Range Power Supplies Measuring & Monitoring Relays Standard Range Interface Relays & Optocouplers Primary Switched-Mode Power Supplies