If the contacts of a motor starter or...

Question 1 / 270705eccefa4bacbc34ba4d48506

Question 1 of 270705eccefa4bacbc34ba4d48506

If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?

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Question 1 of 27070

If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?

🔍 Key Concepts

• How a motor starter or controller uses start and stop buttons to energize and de-energize a coil • What it means when contacts or buttons become mechanically or electrically stuck • The function of a shading coil in an AC magnetic starter

💭 Think About

• Think about what must physically happen inside the starter when you press the stop button. What is supposed to drop out, and what could prevent that movement? • Which of these choices would keep the circuit or magnetic field continuously energized, even when the stop button opens? • For the shading coil options, ask yourself: if the shading coil is loose or broken, would that make the starter more likely to stay picked up, or more likely to chatter/drop out?

✅ Before You Answer

• Identify which component in the list could become permanently closed so that opening the stop button doesn’t break the circuit • Consider whether "insufficient current" through stop contacts would logically hold a coil in or cause it to drop out • Recall that a shading coil mainly affects AC magnetic relay chatter and smoothness of operation, not whether the stop button can open the circuit

Question 1 of 27070

If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?

stop contacts have become welded together

stop contacts are carrying insufficient current

starter shading coil is loose

starter shading coil is broken

Question 1 / 270705eccefa4bacbc34ba4d48506

Question 1 of 270705eccefa4bacbc34ba4d48506

If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?

Back

Question 1 of 27070

If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?