supply of 33 kv, 400 a, triple pole, double break isolators at 3x105 mw, thps-i, sirmour. , 33 kv, 400 a, triple pole, manually gangoperated, double break , centre post rotating , outdoor type, off load isolators without earth switch, consisting of hot dip galvanized channel iron base and h.t. original post insulators, copper or copper alloy high pressure heavily tinned complete with horizontal mounting , horizontal connecting g. i. pipe & g. i. pipe as down rod, coupling for pipe, lever and operating handle with locking arrangement and 4no + 4nc auxiliary switch for main switch , manufactured as per iss 1818/1961 .(using 2nos: 22 kv post insulators per stack & 3 stack per phase) , 33 kv, 400 a, triple pole, manually gangoperated, double break , centre post rotating , outdoor type, off load isolators with manual operated earth switch, consisting of hot dip galvanized channel iron base and h.t. original post insulators, copper or copper alloy high pressure heavily tinned complete with horizontal mounting , horizontal connecting g. i. pipe & g. i. pipe as down rod, coupling for pipe, lever and operating handle with locking arrangement and 4no + 4nc auxiliary switch for main switch and 2 no + 2nc auxiliary switch for earth switch , manufactured as per iss 1818/1961 .(using 2nos: 22 kv post insulators per stack & 3 stack per phase)