bulgaria-varna: isolating switches./ "delivery of remote-controlled disconnectors for overhead power lines (vel) at designated positions for the needs of "elektrorazpradelenie sever" jsc"./ "delivery of remote-controlled disconnectors for overhead power lines (vel) at designated positions for the needs of "electrorazpradelenie sever" jsc" i. separate position - supply of remote-controlled sf6 - isolated power disconnector for srh; ii. separate position - delivery of remote-controlled sectionalizing power disconnector for vel srn; iii. separate position - delivery of a remote-controlled sectionalizing disconnector for vel srn;