🔍 Key Concepts

• Trace the control circuit (lower diagram B) from L1 through the Off/Run switch, the M coil, and the OL contact back to the line. • Think about how a momentary loss of line voltage affects the M (contactor) coil and whether anything in the circuit "changes state" mechanically and stays that way after power is restored. • Compare the functions of the disconnect switch (DS), the OL (overload) contacts, and the Off/Run selector switch—which of these are manually operated, and which are automatic/protective devices?

💭 Think About

• If the power disappears briefly, what happens to the M coil and its associated power contacts feeding the motor? When power comes back, what decides whether the coil gets energized again? • Does a loss of power cause the OL device to trip, or does it only react to overcurrent/overload? How does that help you eliminate some options? • Look closely at whether there is any "low-voltage protection" device or auxiliary contact that would force the operator to take an action before the motor can be re-energized.

✅ Before You Answer

• Verify whether the Off/Run selector switch is a maintained position switch or a momentary pushbutton—would it change position by itself during a power loss? • Confirm that the OL contact shown in the control circuit is normally closed and opens only on overload, not on simple loss of power. • Check whether there is any auxiliary M contact in series with the M coil that would provide low-voltage protection (i.e., drop out the circuit until a manual restart), or if the coil is connected directly through the maintained selector.