The potential relay coil is wired:

The potential relay coil is wired:

• A. In parallel with the start winding.
• B. In series with the run winding.
• C. Across the power supply.
• D. In parallel with the run winding.

Answer: (A)

The starting relay is meant to sense the same conditions as the starting circuit so it can disconnect the start winding at the right moment. Placing the potential relay coil in parallel with the start winding means it experiences the same voltage as drives the start winding. When you apply power, the start winding (often with a capacitor) draws current and the relay coil is energized, holding the starting circuit in place. As the motor speeds up, the current in the start winding drops, the relay coil loses energization, and the contacts open to remove the start winding from the circuit. If the coil were in series with the run winding, across the supply, or in parallel with the run winding, it wouldn’t correctly reflect the start-winding conditions and the starting circuit wouldn’t disengage properly.

The starting relay is meant to sense the same conditions as the starting circuit so it can disconnect the start winding at the right moment. Placing the potential relay coil in parallel with the start winding means it experiences the same voltage as drives the start winding. When you apply power, the start winding (often with a capacitor) draws current and the relay coil is energized, holding the starting circuit in place. As the motor speeds up, the current in the start winding drops, the relay coil loses energization, and the contacts open to remove the start winding from the circuit. If the coil were in series with the run winding, across the supply, or in parallel with the run winding, it wouldn’t correctly reflect the start-winding conditions and the starting circuit wouldn’t disengage properly.