When the stop button is pressed on a motor controller, it ______.

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 3

Answer 1

When the stop button is pressed on a motor controller, it releases the contactor coil.
Due to which flow of current to the motor is interrupted & motor operation stopped.
The contractor coil holds the switch ON condition when the motor is in running condition and interrupts the flow of current to the motor once the stop button is pressed.
It also incorporates the overload tripping mechanism that can be operated by either thermal or magnetic overload trips. These tripping mechanisms are activated when there is a sustained increase of current flow through the starter.