As shown in the illustration, what mechanism...

Question 1 / 2066636eed28f7522a1c51db65

Question 1 of 2066636eed28f7522a1c51db65

As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overload? Illustration EL-0080

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Question 1 of 20

66636eed28f7522a1c51db65

As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overload? Illustration EL-0080

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🔍 Key Concepts

• Trace the current path from the 3-phase supply (L1, L2, L3) through the contactors (KM1, KM2, KM3) to the motor, noting where the OL (overload) device is located. • Distinguish between overload protection (responds to sustained overcurrent) and short-circuit/fault protection (fast-acting fuses). • Look at how the OL contact symbol appears in the control circuit side and how it would interrupt the coil of the main contactor feeding the motor.

💭 Think About

• Follow the diagram and ask: when the motor draws too much current for a long time, which device is designed to heat up and then open a control contact, rather than simply blowing a fuse? • Which component, when it operates, will cause the main contactor feeding the motor to drop out, thereby disconnecting the motor from the line? • Are the listed fuses primarily sized and placed for line/transformer protection, or for sensing sustained overload in the motor windings themselves?

✅ Before You Answer

• Verify which symbol in the power circuit is labeled OL and how its contacts are shown in the control circuit (normally closed contact in series with the contactor coil). • Check which devices (by label) are directly in series with the motor line conductors versus those that only protect the control transformer or incoming line. • Confirm which device is explicitly associated with overload relay heaters rather than just short-circuit protection fuses.

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Question 1 of 20

As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overload? Illustration EL-0080

transformer primary fuses FU4 and FU5

transformer secondary fuses FU6 and FU7

overload relay heaters and overload relay NC contacts (OL)

disconnect switch fuses FU1, FU2, and FU3

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Question 1 / 2066636eed28f7522a1c51db65

Question 1 of 2066636eed28f7522a1c51db65

As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overload? Illustration EL-0080

Back

Question 1 of 20

66636eed28f7522a1c51db65

As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overload? Illustration EL-0080

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed