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how to select the power contactor in Diffrent AC motors.
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Answer Posted / pvr.parthasarathi
For selecting a power contactor for a particular motor the following points are to be considered.
1) Type of the motor ie. Squirrel cage, Slipring .
2) Full load of the motor and its Voltage .
3) Operating cycle of the motor ie. S1 , S2 -----.
4) Nature of the drive ie. cycle of operation such as normal , jogging, Breaking etc.
So selecting the contactor for a motor does not have single point formula. But as a thumb rule for 3 phase motors it can be selected at 130 percent of FLC, if all other factors are normal.
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