ATC Diversified Electronics ARA Alternating Relays alternate the sequence while assuring equal run time on all loads. These alternating relays offer triplexor, quadraplexor, and duplexor variants. The triplexor and quadraplexor are designed to be used in multiple load installations, which allows additional loads to run in the event of excess load requirements. These triplexor and quadraplexor relays feature external clocking alterations and automatic alterations. The alternating action is initiated by a control switch, familiar with one side of the control voltage, when the factory-installed jumper is in place. Alternating movement is undertaken by an isolated, ordinarily open switch when the jumper is removed. The triplexor and quadraplexor relays operate at 240V switching voltage and 120V coil voltage.