Why does a motor take 1 ampere when current passes through auxiliary contacts, whereas it takes 10 ampere?

Kumar Sahoo

Kumar Sahoo

@kumar-JBoFlF • Oct 26, 2024

motor takes 1 ampere when current passes through auxiliary contacts it takes 10 ampere why?

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  • Ramani Aswath

    Ramani Aswath

    @ramani-VR4O43 • May 9, 2019

    The question is not clear. A sketch of the circuit may help.


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  • Kumar Sahoo

    Kumar Sahoo

    @kumar-JBoFlF • May 10, 2019

    A single phase  1 HP motor connected  with a DOL starter which  having  2 push buttons one is start(green) another one is stop (red). As per the  principle  of W= √3VIcosΦ the motor should take 1.48amps but it's taking  10 Amp.  How? 


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  • Ramani Aswath

    Ramani Aswath

    @ramani-VR4O43 • May 10, 2019

    In a single phase motor, W= VxIx cos(phi).

    Full load current of a 1 hp induction motor will be about 8 amps taking into account power factor.

    You seem to be taking the formula for the single phase current of a 1 hp three phase induction motor.

    Please see here:

    <a href="https://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html" target="_blank" rel="nofollow noopener noreferrer">Electrical Motors - Full Load Amps</a>

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