What is (HAND-OFF-AUTO) in control panels /Electrical control panels basics...

manual -off-auto selector switch is the option for the electrical equipment to operate in three way by selecting .If selector selected in Manual the equipment will be controlled or operated directly.
and the equipment will be operated and controlled by external instruments or device like plc, SCADA, BMS, pressure switch or timer if selection selected to auto side. Also you can disable the operation by keeping the selector switch in off position.
This video we have explained the use and wiring of manual-off-auto 3position selector switch for control panel
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Thanks bro