Circuit a using relay normally closed contact shunt trip coil method

2) The circuit using the relay normally closed contact shunt trip coil method is shown in Figure 6-63. Figure 6-63 (a) is the wiring diagram, and Figure 6-63 rb) is the expanded view.     In the picture, TA. , TAw are U-phase and W-phase current transformers, KIl and <Iz are current relays , YRi and YRz are circuit breaker overcurrent releases respectively. They are installed in the CS2 operating mechanism.