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 Time Relays Previous Generation Controls & Protective Relays Measuring & Monitoring Relays Interface Relays & Optocouplers Limit Switches