🔍 Key Concepts

• Follow the control circuit in diagram B from L1 through the off/run switch, coil M, and OL contact to see what becomes energized when the switch is moved to RUN. • Understand which devices are normally closed (NC) and normally open (NO) before the motor is started (disconnect switch DS, overload relay OL, main contacts M). • Distinguish between control-circuit actions (coil energizing, OL contact state) and power-circuit actions (main contacts closing, motor receiving line voltage).

💭 Think About

• When you move the off/run switch to RUN, what new current path is created in the control circuit, and which component in that path responds first? • Look at how the main contacts (3) "M" and the OL contacts are drawn: are they waiting on some other device to change state before they can operate? If so, which device is that? • If the problem states that power is already available at the control circuit, what does that tell you about the state of the DS contacts at the moment you touch the off/run switch?

✅ Before You Answer

• Verify the initial state of DS, OL, and M contacts before the switch is moved (which are already closed?). • Confirm which component is directly in series with the off/run switch in the control circuit and will react as soon as that switch closes. • Make sure you separate cause (control coil operation) from effect (power contacts and motor connection) when deciding what occurs first.