Which device is used to control motor operation by switching high current in the circuit?

Which device is used to control motor operation by switching high current in the circuit?

• A. Line starter
• B. Fuse
• C. Transformer
• D. Pilot lamp

Answer: (A)

Line starters are used to control motor operation by switching high current in the circuit. They couple a low-current control signal to a high-current motor circuit using a contactor, so you can start and stop the motor safely while providing overload protection. The coil in the starter is energized by a small control signal, which closes the motor’s high-current contacts to feed the motor. A fuse is a protective device that interrupts current when there’s an overload, not a switch for normal operation; a transformer changes voltage rather than switching motor current; a pilot lamp is only an indicator. So the line starter is the device specifically designed to handle the motor’s high-current switching.

Line starters are used to control motor operation by switching high current in the circuit. They couple a low-current control signal to a high-current motor circuit using a contactor, so you can start and stop the motor safely while providing overload protection. The coil in the starter is energized by a small control signal, which closes the motor’s high-current contacts to feed the motor. A fuse is a protective device that interrupts current when there’s an overload, not a switch for normal operation; a transformer changes voltage rather than switching motor current; a pilot lamp is only an indicator. So the line starter is the device specifically designed to handle the motor’s high-current switching.