Stays energized during both Star and Delta stages. Star Contactor (K2): Closes first to create the star point.
Confirm your motor is rated for Delta operation at your local supply voltage (e.g., a 400V Delta motor on a 400V supply).
The timer reaches its limit and opens the circuit to the Star Contactor while closing the circuit to the Delta Contactor . star delta control circuit diagram pdf free download
While we provide the logic here, having a high-resolution schematic on your phone or tablet is vital for field work. You can find standardized via reputable electrical engineering portals like Electrical Technology or Electrical4U .
The timer begins counting down (usually set for 5–10 seconds depending on the load). Stays energized during both Star and Delta stages
Closes after a set delay for full power.
are used to "latch" the circuit so the motor keeps running after you release the Start button. Safety Tips for Installation The timer reaches its limit and opens the
To build or troubleshoot this circuit, you need the following key components: