The ISO/ISL Series multiple channel devices are used to provide asafe and reliable means of controlling loads from hazardous locationswithout releasing sufficient energy under normal or abnormal conditionsto cause ignition of a flammable or combustible atmosphericmixture while in its most easily ignited concentration. An isolatedoutput turns on when the corresponding control switch input from thehazardous location is activated. When using normally closed controlswitch inputs, a jumper should be installed between terminals 1 and2. Normally open control switch inputs do not require the optionaljumper. When thenon-latching ISO Series control switch input is activated, its correspondingoutput turns on. When the control switch input is deactivated,its output turns off. When the latching ISL Series controlswitch input 2, 3 or 4 is activated, its corresponding output turns on.When control switch 2, 3 or 4 is deactivated, its corresponding outputremains latched on as long as control switch input 1 is activated;otherwise it turns off immediately. Control switch input 1 also controlsoutput 1 just as in the non-latching ISO Series.