3 Phase AC use 4 pool magnetic contactor
4 pole and 5 pole magnetic contactor use in 3 phase units. we should always use magnetic contactor in 3 phase because magnetic contactor control the wire when the magnetic contactor is off so that magnetic contactor will not Pass electricity 1 point to 2nd point When the magnetic contactor is ON then pass electricity 1 point to 2nd point. magnetic contactor work look like safety device.
Magnetic contactors are a form of electrical relay found on most electrically powered motors. They act as a go-between for direct power sources, and high-load electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well as to act as a safeguard. It should be noted that though they are similar in design, magnetic contactors are not circuit breakers. They do not sever the connection between appliance, and power source during a short circuit. They are detachable from a motor so that an operator may work with that motor; disassemble or maintain it, without the possibility of live current still passing through the device.
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