The contactor connected in parallel with the soft starter is called a bypass contactor, because the long-term use of the soft starter to start will cause a lot of pressure on the thyristor.
Excessive current of the thyristor for a long time is not good for it. At the same time, it is also easy to cause problems by relying on the circuit board to trigger the thyristor. It is better to use a traditional contactor to maintain it, because the soft start is only useful during the motor starting process and runs at the power frequency. It is the same as the usage of ordinary motors, so it is still reliable to use traditional contactors.
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