Page 421 - Industrial Power Engineering and Applications Handbook
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Switchgear and controlgear assemblies  13/395





                                          CF






                                                                                       I IC 1




                                                                                                c2





                                                                                                c1



                                                                                 I              1
                           1 1 -                                              hll         On   1  h3
                           L                                                  ~                 -
                aa  blb    ccg                c1                            trip  >  c trip   slow   fast   if
                                             r)                            (slow)  (fast)





                                     8 pole (A)     4  pole double star(’f  ‘f)
                                      (slow)            (fast)
                                          Figure 13.59  Dual-speed startel
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