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There are different sorts of contactors, and each type will have its own arrangement of determinations relying upon your application. A few key particulars are AC Contactor or DC Contactor with loops including 12 V, 24 V, 48 V, 110 V, 240 V, 400 V, and 440 V. Turning around or non-switching usefulness. AC3 and AC1 classes Contactors with 2, 3, 4 poles, surprisingly, 8 and 10 shaft variations. Different contact arrangements. IEC guidelines