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Electrical switches can look very similar on the wall while doing very different jobs. Much of the confusion comes from product names combining terms such as rocker, 2-way, intermediate, 3-pole and 45A, even though each describes a different characteristic. The useful starting point is therefore not the finish or even the shape of the switch. First establish what needs to be controlled, from how many positions, and whether the accessory needs to provide isolation for a fan or appliance. For …