37Planning the electrical installationProtecting the contacts of relay outputsInductive loads (relays, contactors, motors) cause voltage transients when switchedoff.Equip inductive loads with noise attenuating circuits (varistors, RC filters [AC] ordiodes [DC]) in order to minimize the EMC emission at switch-off. If not suppressed,the disturbances may connect capacitively or inductively to other conductors in thecontrol cable and form a risk of malfunction in other parts of the system.Install the protective component as close to the inductive load as possible. Do notinstall protective components at the I/O terminal block.Varis t or230 V ACRC filterDriverelayoutput230 V ACDiode24 V DCDriverelayoutputDriverelayoutput
