Typical control circuit of CT8 type spring operating mechanism

The CT8 spring operating mechanism is often used in conjunction with the SN10 oil-less circuit breaker. (1) Typical control circuit
of CT8 spring operating mechanism     The circuit is shown in Figure 6-72. (2) CT8 type operating mechanism improved circuit The circuit shown in     Figure 6-72 still has the following problems in actual use: ① During normal operation, the normally closed contact of the intermediate relay KA has large sparks and is easy to burn; ② Occasionally, it may occur The closing coil YA burned out; ③Contacts 5 and 8 of the control switch SA burned out; ④When the opening operation was not performed, the anti-trip relay KA automatically closed by mistake, cutting off the closing circuit .