The scenario
Designing a motor control circuit for starting a three-phase induction motor directly from the line with overload protection.
What is in this drawing
Read the decisions behind it.
01
Three-phase power routing through main contacts and overload relay
02
Control circuit with start/stop pushbuttons and self-holding auxiliary contact
03
Overload protection using thermal relay with NC contact in series with coil
When a motor requires full voltage starting and the power system can handle the inrush current.
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