bids are invited for operation and maintenance of electrical systems/electrical installations - supply of different types of material at 132 kv sub station mirzapur under etd mirzapur - supply of power contactor ,model 3tf30 10e,230 v ac siemens make or as per s le provided. , supply of overload relay of rating (0.6-6a) as per s le for cooling fan of transformers on the front side of the marshaling box. , supply of 06a,spn mcb,10 ka,230v,siemens/havells/l&t make , supply of 25a,spn mcb,10 ka,415v,siemens/havells/l&t make , supply of 20a,tpn mcb,10 ka,415v,siemens/havells/l&t make , supply of 06a,tpn mcb,10 ka,415v,siemens/havells/l&t make