Question:
How many contactors does a star-delta motor starter require?
How many contactors does a star-delta motor starter require?
Updated On: Jul 5, 2025
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The Correct Option is B
Solution and Explanation
A star-delta starter is a type of reduced voltage starter for induction motors. It reduces the starting current of the motor by initially connecting it in a star (Y) configuration and then, after a set period, switching it to a delta (Δ) configuration for normal operation.
To implement this control, the starter requires the following three contactors:
Main Contactor (KM1) – Connects power to the motor circuit.
Star Contactor (KM2) – Connects motor windings in star during startup.
Delta Contactor (KM3) – Connects motor windings in delta after transition.
These contactors work in coordination through a timer to switch between star and delta connections safely and effectively.
To implement this control, the starter requires the following three contactors:
Main Contactor (KM1) – Connects power to the motor circuit.
Star Contactor (KM2) – Connects motor windings in star during startup.
Delta Contactor (KM3) – Connects motor windings in delta after transition.
These contactors work in coordination through a timer to switch between star and delta connections safely and effectively.
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