Which of the following illustrated circuit...

Question 1 of 31048cBtsvfwBumSqHNyjYB98

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side current sensing technology? Illustration EL-0222

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Question 1 of 31048

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Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side current sensing technology? Illustration EL-0222

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🔍 Key Concepts

• Phase failure protection purpose in a three‑phase motor circuit • Difference between voltage sensing on the line side vs current sensing on the load side • How current transformers (CTs) are drawn in motor control schematics

💭 Think About

• In each option, ask yourself: Is the phase failure relay looking at line voltage, or at the actual current going to the motor windings? • Which schematic shows the sensing device located physically and electrically on the motor leads rather than just across the incoming line terminals? • Which diagram includes separate sensing elements around each phase conductor, indicating current measurement rather than simple voltage presence?

✅ Before You Answer

• Identify which illustration shows CT symbols (small donuts around each phase lead) feeding the phase failure relay • Confirm that the sensing elements are on the load side of the starter/overload, so a broken conductor between starter and motor will still be detected • Verify that the phase failure relay in your chosen option would drop out (and open the control circuit) when any one phase current goes to zero