DG636EQ-T1-E3` DG636EQ-T1-E3= DG636S-9.52-02P-14-00AH DG636S-9.52-03P-14-00AH DG638-9.52-02P-14-00AH DG638-9.52-03P-14-00AH DG640 DG6400 DG6409DY DG640D