Alternating Relays are used in special applications where the optimization of load usage is required by equalizing
the run time of multiple loads. Identical loads are used for the same job—a standby unit is available in case the
first load fails. However, an idle load might deteriorate due to lack of use and provide no safety margin. Alternating
relays prevent this by assuring that multiple loads get equal run time. In addition, there are situations where a need
arises to have multiple loads on at the same time for additional capacity if one load cannot keep up with demand.
This alternating action is normally initiated by a control switch such as a fl oat switch or pressure switch. Each time
the initiating switch is opened, turning off a load, the alternating relay will change state, thus alternating the multiple loads.
Macromatic offers two types of Alternating Relays:
• Duplex: For controlling two loads, both plug-in & inner-door mounting, in SPDT, DPDT and DPDT Cross-Wired output configurations
• Triplex: For controlling three loads, plug-in mounting