cm8Mini Circuit Breaker CM8-63 . Mini Circuit Breaker CM8-63. Mini Circuit Breaker CM7-63; Mini Circuit Breaker CM1-63; Hamburger Toggle Menu. CM8-1P. CM8-2P. CM8-3P. CM8L-2P.Where is CM8? Home; Postcode; CM; CM8; CM8 is in the county of Essex. It contains the town of Witham, as well as Wickham Bishops, Silver End, White Notley, Rivenhall, and Beacon Hill.