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
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  1. Trips the I/P MCB
  2. Releases the contractor coil
  3. Dis-engages the overload relay
  4. Creates a short circuit tripping the overload relay

Answer (Detailed Solution Below)

Option 2 : Releases the contractor coil
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Detailed Solution

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  • 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.
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