If a magnetic controller contactor fails to...

If a magnetic controller contactor fails to...

Question 1 of 270705eccefa4bacbc34ba4d48509

If a magnetic controller contactor fails to pick up when the coil voltage is applied to the contactor coil, what would likely be the cause?

Question 1 of 27070

Q

If a magnetic controller contactor fails to pick up when the coil voltage is applied to the contactor coil, what would likely be the cause?

🔍 Key Concepts

• Magnetic contactor operation – how the coil and armature work together to pull in the contacts • Difference between mechanical problems (springs, alignment, contacts) and electrical problems (coil continuity, voltage) • What condition must exist inside the coil circuit for the magnetic field to be strong enough to pull in the armature

💭 Think About

• Ask yourself: if voltage is applied to the coil but the contactor never pulls in, what does that tell you about the magnetic field being produced? • Which choice describes a condition that would completely prevent current from flowing and a magnetic field from forming in the coil? • Which other choices would more likely cause chattering, overheating, or poor contact rather than total failure to pick up?

✅ Before You Answer

• Check which option would completely interrupt the coil circuit so no magnetic field can be produced. • Check which options are mainly mechanical issues that might affect contact pressure or wear but would not stop the coil from energizing. • Verify that your chosen option explains a total failure to pick up, not just weak operation or nuisance tripping.