Y-△ step-down starting circuit 2 with arc flashover short circuit protection function 2

(2) Y-△ step-down starting circuit 2 with anti-arc short-circuit protection function     . The circuit is shown in Figure 3-43. This circuit can prevent arcing short-circuit between contactor contacts (even if the motor has a certain load) start up). In addition, when the time relay KT fails, the motor will not run under the star connection for a long time and cause harm.