Which starter method provides a full voltage connection once the motor reaches proper speed?

The primary resistor starter method is designed to limit the initial current flow to the motor, which helps reduce the mechanical and electrical stress on both the motor and the electrical system during startup. This method achieves a gradual increase in voltage and thus allows the motor to slowly reach its operational speed.

Once the motor has accelerated to its proper speed, the resistors are switched out of the circuit, allowing the motor to receive full line voltage. This transition to full voltage is critical for ensuring that the motor can perform optimally and deliver the necessary torque for its intended application.

In contrast, direct-on-line starters immediately apply full voltage to the motor at startup, which results in high inrush current. Autotransformer starters reduce the voltage initially but do not provide a full voltage connection as soon as the motor reaches speed. Soft starters gradually ramp up the voltage but do not provide full voltage connection in a direct manner; rather they allow for a controlled start and stop.