air contactor Tenders | Latest Tenders for air contactor

Supply of Air Brake Power Contactor, Type - 3Ta22 10-0Af, Amp-30A, Volt-415V, Coil - 110V, 50Hz, 2No+ 2Nc. Make - Seimens Warranty Period: 30 Months After The Date Of Delivery

Supply Of General Electric Goods Items -Air Break Contactor 3Ta 22, 220 Volt, Air Break Contactor 3Ta 24, 220 Volt, Alluminium Cable Lugs All Mm Size, Amp Meter With C.I. Pedestal/Squire Type 100 A, Amp Meter With C.I. Pedestal/Squire Type 200 A, Amp Meter With C.I. Pedestal/Squire Type 400 A, Amp Miter C.I. 4X4 0 To 100, Amp Miter C.I. 4X4 0 To 150, Amp Miter C.I. 4X4 0 To 300, Amp Miter C.I. 4X4 0 To 400, Ampere Meter Size 6X6 3000/5 , Anchor Make Flash Type Switch 15 Amp Combind, Anchor Make Flash Type Switch 5 Amp Combind, Angle Holder 5 Amp, Bakalite Sheet 10X12, Bakalite Sheet 2X4, Bakalite Sheet 8X10, Bare Copper Wire 4 Swg For Cane Unloader, Battery Terminal In Copper, Batton Holder 5 Amp, Bch Make Coil , Bch Make Vaccum Type Meter/Timer 110 V 30 Sec, Bectrol Gray Dr. Back Make, Bectrol Red Dr. Back Make, Bed Switch 6 Amp, Benzene 500 Ml, Box Spanner Set Taparia, Brass Holder 100X20x20, Brasso 100Ml, Cable Griping Paste, Capacitor 10 Mfd, Capacitor 3.5 Mfd, Capacitor 4 Mfd, Capacitor 6 Mfd, Carban Brush For 1875 Kva Alternator Ket 16X32x14, Carban Brush For 1875 Kva Alternator Ket 50X32x19, Carben Brush Double Tail 50X32x22 Ket Make 150 Wd, Carben Brush For Cane Unloder Size 100X20x20, Carbon Brush 38X22x95 Jyoti Make, Carbon Brush 50X25x16 Jyoti Make, Carbon Brush 50X40x20 Jyoti Make, Carbon Brush For 18.5 Kw Alternator Size 12X24x30, Carbon Brush Holder 250 M Kirloskr, Carbon Bush 16X32x40 Jyoti Make, Carbon Bush 20X32x42 Jyoti Make, Carbon Bush 20X32x48 Jyoti Make, Carbon Bush 20X32x52 Jyoti Make, Changeover Switch Type Fp 32 Amp, 440 Volt, Changeover Switch 100 Amp 4 Pole , Changeover Switch 200 Amp, Changeover Switch 250 Amp 4 Pole, Changeover Switch 300 Amp, Changeover Switch 320 Amp 4 Pole, Changeover Switch 400 Amp, Changeover Switch 630 Amp, Codensor 2.5 Mfd, Combination Plier 8, Connection Plate For Motor 10 Hp Kel, Connection Plate For Motor 100 Hp Ngef, Connection Plate For Motor 15 Hp Kel, Connection Plate For Motor 150 Hp Ngef, Connection Plate For Motor 20 Hp Kel, Connection Plate For Motor 25 Hp Kel, Connection Plate For Motor 40 Hp Kel/Bbl, Connection Plate For Motor 60 Hp Kec With Utype, Connection Plate For Motor 7.5 Hp 10 Hp Kel, Connection Plate For Motor 70 Hp Ngef, Connection Plate For Motor 75 Hp Ngef, Cooler Pump Submersible Type, Copper Cable Lugs All Size, Copper Conductor For Cane Unloader, Cotton Tape 1/2, Cotton Tape 3/4, Crc 2-26, Ctc, Dc Ct Jyoti Make Catno 4/75/3993/10 400 Amp, Digital Energy Miter 340 Volt, Digital Multimeter 0-10000 Ac/Dc, Digital Rpm Meter With Sensor, Drum Controller For Box Crane, Dyno Drive 40 Hp Eddy Current, Dyno Drive Controller For 50Hp, Ebonite Rod 2, Ebonite Rod 3, Emery Tape 3/4, End Shield 6.3 Amp, English Electric Fuse 50 Amp, English Electric Make Hrc Fuse 100 A, English Electric Make Hrc Fuse 16 A, English Electric Make Hrc Fuse 200 A, English Electric Make Hrc Fuse 32 A, English Electric Make Hrc Fuse 63 A, Exhaust Fan 12, Exhaust Fan 18, Exhaust Fan 24, Extension Board 16 Amp, Fiber Glass Sleeve 10Mm, Fiber Glass Sleeve 12Mm, Fiber Glass Sleeve 16 Amp, Fiber Glass Sleeve 60 Amp, Fiber Glass Sleeve 8 Mm, Film Leatherised Paper Black, Fix Archng Contact For Ocb Met Make 200 Amp, Fix Archng Contact For Ocb Met Make 400 Amp, Fix Contact For Ocb Met Make 200 Amp, Foot Switch Complete For Bag Stitching Machine, Foot Switch For Stitching Machine, Fuse Tinned Copper Wire 32 Amp, Fuse Wire 10 A, Fuse Wire 100 A, Fuse Wire 35 A, Fuse Wire 63 A, Gi Bolt 10Mm X 75Mm, Gi Bolt 12Mm X 100Mm, Gi Bolt 12Mm X 100Mm, Gi Bolt 12Mm X 36Mm, Gi Bolt 12Mm X 50Mm, Gi Bolt 6Mm X 25Mm, Gi Bolt 6Mm X 75Mm, Gi Bolt 8Mm X 200Mm, Gi Bolt 8Mm X 50Mm, Gi Bolt 8Mm X 75Mm, Gi Nut 10Mm, Gi Nut 12Mm, Gi Nut 6 Mm, Gi Nut 8Mm, Gi Washer 10Mm, Gi Washer 12Mm, Gi Washer 8Mm, Glass Fuse 30 A, Glass Fuse 5 A, Glass Fuse 6 A, Hand Held Vibration Meter, Hand Operated Techo Meter Digital , Hp - 03 12 Amp Two Rotor, Hp-25 40 Amp Single Rotor, Hrc Fuse Ns Type 16 Amp, Hrc Fuse Ns Type 20 Amp, Hrc Fuse Ns Type 32 Amp, Hrc Fuse Ns Type 6 Amp, Hrc Fuse Ns Type 63 Amp, Hylam Sheet 6Mm Thick, Ictp Main Swietch 32 Amp, Ictp Main Switch 100 Amp, Ictp Main Switch 125 Amp, Ictp Main Switch 16 Amp, Ictp Main Switch 250 Amp, Ictp Main Switch 32 Amp, Ictp Main Switch 320 Amp, Ictp Main Switch 400 Amp, Ictp Main Switch 63 Amp, Ignitor 0-400 Watt, Insulating Varnish Dr. Back Make, Insulating Varnish Other Brand, Insulator For Resistance Box For 150 Hp Mei, Kit Kat Backlit 100 A, Kit Kat Backlit 16 A, Kit Kat Backlit 32A, Kit Kat Backlit 63 A, Kit Kat Porcelain Base 100 A, Kit Kat Porcelain Base 16 A, Kit Kat Porcelain Base 32 A, Kit Kat Porcelain Base 63 A, Leather Paper Good Quality, Led Bulb 15 W Phillips/Syska, Led Bulb 20 W Phillips/Syska, Led Street Light 200 W Syska / Bajaj, Led Street Light 50 W Syska / Bajaj, Led Tube Light 100W Phillips/Syska, Led Tube Light 50W Phillips/Syska, Led Tube Road 20 W Phillips/Syska, Led Tube Road 50 W Phillips/Syska, M.C.B. 10 Amp Single Pole, M.C.B. 16 Amp Single Pole, M.C.B. 6 Amp Single Pole, Magger Hd 500V With Lead, Motor Cooling Fan Plastic 10 Hp, Motor Cooling Fan Plastic 12.5 Hp, Motor Cooling Fan Plastic 15 Hp, Motor Cooling Fan Plastic 20 Hp, Motor Cooling Fan Plastic 25 Hp, Motor Cooling Fan Plastic 30 Hp, Motor Cooling Fan Plastic 40 Hp, Motor Cooling Fan Plastic 5 Hp, Motor Cooling Fan Plastic 50 Hp, Motor Cooling Fan Plastic 7.5 Hp, Moving Coil Type Amp Meter 0-10A For Dc Supply 4X4, Moving Contact For Ocb Met Make 200 Amp, Multi Meter Digital, No Volt Coil 3 Ta 22 220 Volt, No Volt Coil 3 Ta 24 220 Volt, Nomex Paper Fire Proof 5 Miles, Nomex Paper Fire Proof 7 Miles, P.I. Indicator Anchor Make, Pendent Holder 5 Amp, Pin Type Lugx 20 Mw Cable, Pin Type Lugx 50 Mw Cable, Pin-3 Plug Top 15 Amp, Pin-3 Plug Top 5 Amp, Pole Assembly For 3200 Amp Mcb/Ocb/Acb, Power Capacitior In 25 Kvarepcoh/Jabik/Mahar Make, Pressure Switch For Negative Pressure Dentos Make Up To 5 Kg. Nov Adjusting Type, Pt Bulb 100 Watt, Push Button Element 1 No, Push Button Station, Pvc Aluminum Wire 2 Core, 1 Mm, Pvc Cable Polycabe Make , Pvc Cable Grandley Make , Pvc Copper Flexible Wire 2 Core , Pvc Copper W/Shop Flexible Wire 3 Core , Pvc Copper Wire National/Bidut/Havells Make 1.00 Mw, Pvc Copper Wire National/Bidut/Havells Make 1.50 Mw, Pvc Copper Wire National/Bidut/Havells Make 2.0 Mw, Pvc Copper Wire National/Bidut/Havells Make 2.50 Mw, Pvc Copper Wire National Make Isi Marked, Pvc Copper Wire Vidut Make Isi Marked, Pvc Flexvle Cable 6 Core Copper Wire 140/33, Pvc Tape Steel Grip Anchor Make 3/4, Rv 455Xra 165 Mei Make , Se Copper Wire Swg 19, Se Copper Wire Swg 19.5, Se Copper Wire Swg 20, Se Copper Wire Swg 21, Se Copper Wire Swg 22, Se Copper Wire Swg 23, Se Copper Wire Swg 24, Sliping For 10 Hp Ngfe Motor, Sliping For 1502 Hp Kec Motor, Sliping For 50 Hp Kec Motor, Sliping For Jyoti Make Power Turbine Alternater 1.5 Mw, Slipring Block Assembly For 250 Hp Kirlosker Motor, Slipring Holder 150 Hp Motor, Slipring Induction Motor Startar With Resistanc Box For Slipring Motor 150Hp-50 Hz P Complete Ocb, Slipring Induction Motor Startar With Resistenc Box 150 Hpx960 Rpm Mei/Crompton Make, Slipring Motor Starter Resistance Box 400Amp 250 Hp, Socket 2 Pin Anchor, Socket 5 Pin Anchor, Spare Kit 3Ta 22, Speedo Meter Rang 0-10000 Isi Mark, Step Down Transformer With Enclose Input 240 V Out Put 24 Volt, Sunmica Sheet Any Size, Taflon Rod 2X12, Tape For Techo Meter Reading, U Type Air Heater 100 Watt 230 Volt , U Type Air Heater 2000 Watt 230 Volt 990Mm Length , Volt Meter Squire Type 40-500 V, Volt Meter Squire Type 60.500 V, Voltmeter 0 To 500 4X4, Voltmeter 0 To 500 6X6, White Plastic Modular Pvc Multi-Socket Electric Switch Board

Supply Of Cb-Moulded Case Circuit Breaker 5530900196, Mpcb 3P 230V 25A 3 2 5A 1No 1Nc 60A 5530900197, Cb5 Motor Protection Circuit Breaker 5530900200, Air Break Contactor 415V 32A 3 Pole With 5530900204, Ml6 Contactor 230V Ac 2No Plus 2Nc Ss909218000, Bimetal Thermal Overload Relay Thermal 5530900207, Dc Contactor 2No 2Nc 2P 110Vdc 60A 5530900220, Current Limiting Block F H S C 5530900234, Contact Switch 4P 3Way 16A 400V F Hoist 5530900235, 2P 2Way F 250V Crown Cntrl Swtch 5530900236, Dc Ammeter For Hoist Motor Current 5530900252, Dc Volt Meter For Exciter Voltage 5530900251, 3000V 16A Fose Lenk 2Kb3 642T2 Fh1 5530900192, 3 3Kv Hrc Fuse 160A 100A A81sv X 5530900193, Air Distribution Valve With Solenoid 110V Dc G225, L V Ring Bracket 3Ta27850, Ht Brass Pad Thickness 12Mm With 4 Fixing Screw 8Md72003, Ht Ring Insulator Height Range 135 138Mm Stb780078135, Hose 9151320220, Round Rubber Coupling Pad Dia 32Mm Length 65Mm 32 65 Mm

Supply of Air Breaker Power Contactor Q3

Air Break Contactor Armed Ug Cable Hrc Fuse Cable Gland Switch Disconnector Fuse Unit

Supply Of Air Break Contactor Spares -Supply Of Air Break Contactor Spares -Mce15r Contactor 200A With 110V Coil, 16 Amps Contactor With 415V Coil Cat. Coon 4 Pole, Main Contactor Kit For Mce15r Contactor 200A, Main Contactor Kit For Mce10en Contactor, Main Contactor Kit For Mce10dn3 Contactor, No Volt Coil Suitable For Mce15r 110V Ac, No Volt Coil Suitable For Mce10en 110V Ac, No Volt Coil For Mce10dn3 110V Ac., No Volt Coil For Gh-62 440V Ac., 32Amps, 440V Panel Mounting Metal Glad Industrial Type 5 Pin , 32Amps, 440V Panel Mounting Metal Glad Industrial Type 5 Pin Plug, Mush Room Type Push Button Actuator Red, Projected Flush Type, Mush Room Type Push Button Actuator Green, Projected Flush Type, Push Button Element With 1No, Push Button Element With 1Nc

Supply of Direct Online Starter Suitable For 415 V Ac 3Ph 50Hz, 15Hp Induction Motori N Sheet Steel Enclosure With 25Amps Air Break Contactor And On/Off Reset Push Bu Tton But Without Bimetallic Thermal Overload Relay Similar To Bch Make Type Namle- M. Warranty Period: 30 Months After The Date Of Delivery

Contact Set For Seimens 3Tf53 Contactor Main Contact Kit For 3Tf477 70A Siemens Contactor 3Tf4772 Oauo Power Contcr 3Tf5002oauo Coil Volt230vac Main Contact For 3Tf50 110A Contactor Siemens Contactor 3Tf5402 Oau 240V Ac Spare Contact For 3Tf 46 02 Contactor Air Br Pow Contactor 45A 3Tf46 02 Oa U0 Contact 3Tf51 140A 110V 3Ty7 510Oyc A Siemen Contactor 240Vac Type 3Tf5102 Oau Siemen Control Relay 3Th80 22 Oa 240V Ac Aux Control Contactors Ge Make Coil 3Tf55 Contactor Cv 230Vac

Supply Of Transformer 160 Va, Element Servo Filter, Rod Seal, Contactor 415V-40A Mc10 Dn22, Element C/W Seal, Filter Element Kit This Is The Replacement For 370-P-210A &, Bracket Terminal For Micro Switch Assy, Contactor Air Break Tp With 2No+2Nc 240V Oper Coil 415V50c/S, O Ring, Relay Overload 10-16A, Element Suction Filter & Seal Mf 146A, Power Quint 100-240Ac/24Dc/10, Power Quint -Ps/24Dc/24Dc10a, Relay For Co 24Vdc W/Gc And Bd, Io-Module Rrrly8 I Boks, Io-Module Rrdio16 For Prop, Fuse 5X25mm 6, 3A Med, Overload Relay Range 13.2 To 20Amps

Procurement Of Spares - Remote Winding Temparature Indicator For Hv Lv 90260V Acdc P21p22 As Per Toshiba Doc No Ttd1ehvms20211, Auxillary Power Supply Transformer For Oltc Pannel 41555055V 500Va, Oltc Gear Box With Motor 3 Phase Ip55 1250Rpm, Selector Switch Rtcc Pannel, Temperature Selector Switch Oltc Pannel, Tap Position Indicator For Rtcc Pannel 90V260v Acdc 25 Tap1 Kohm Step, Aircel Rapture Relay F54 For 80Mva Trafo, Oil Surge Relay For Oltc F52 For 80Mva Trafo, Hv Bushings With Metal Parts And Gas Cuts For 250Kv Auxtrafo 25 Dia 33Kv Ac, Lv Bushings With Metal Parts And Gas Cuts For 250Kv Auxtrafo 415V Ac, Silica Gel Breather 1 Kg, Neutral Bushing With Metal Parts And Gas Cut Set Hv Porcelain Type 36Kv630a, Neutral Bushing With Metal Parts And Gas Cut Set Lv Porcelain Type 36Kv2000a, Ptr Lv Terminal Connector Acsr Moose, Ptr Hv Terminal Connector Acsr Moose, Master Trip Relay Mvajm25 Burden High Flush Mtg Case Size 4 Aux Voltage 220V Dc Contact Combination18no2nc Erhr With Flag Mvajm25, Dc Supervision Relay Mvaam11 Single Element Voltage Operated Auxrelay Auxvoltage220v Dc Contact Comination 2No2co Sr Flush Mounting Case Size2 Reverse Flag Indicator, Auxiliary Relay 10 No Sr Flagyes220250v Dcwd01mvajm11011 Mvajm11ja1000a, Auxiliary Relay Dc Changeover 2M 2C Srflagyrd110125220250v Dc Wdz1mvaam1101sht1 Mvaam11b1ba2530a, Dc Supply Super Vision Relay 4B Srflagrev220250v Dc80120 Ms Tddcwdz1mvaam11009sht1 Mvaam11b1cj1015a, High Speed Tripping Relay Supervision Relay 1M 2B Sr220250v Dcflagrevwdf1mvaxm21001 Mvaxm21c1ce3005a, Ac Super Vision Relay 4B Srflagrev240v 50 Hz80120 Ms Tddo Wdz1mvaam11010sht1 Mvaam11bcj5515a, Tddo Wdz1mvaam11010sht1 Mvaam11bcj5515a, Control Relay Er Low Burdenvoltage Sel Relay 8 No2 Nc Erfollow On Flag 220250V Dcwd01 Mvajm14011 Mvajm14jb1002a1, High Speed Tripping Relay Lv Trip Relay220250v Dcelectricalhand Reset8m 2B Contact Configcase Size 2 Wd01mvajm15011 Mvajm15ja1002a, High Speed Tripping Relay Hi Budenflagyes Hr Flag220250v Dc18m 2B Erhrwd01mvajm25011sht1 Mvajm25la1002a, Auxiliary Relay 12 No Sr Flagno220250v Dcwd01mvaam31010 Mvaam31c1aa1001a, Dc Supply Super Vision Relay Maam11b1cj5516a, F650 Relay F650nxjf1g1hi6he, 33Kv Vacuum Circuit Breaker Indoor Type Ur36kv Fr50hz Up170kvpstc315ka3sec Sus Bar Rated Ir3000a Normal Ir2500a 3Aho 3156, 33Kv Vacuum Circuit Breaker Indoor Type Ur36kv Fr50hz Up170kvpstc315ka3sec Sus Bar Rated Ir3000a Normal Ir1600a 3Aho 3153, Ac Indicator Lamps For Rtcc Pannel Red Colour, Ac Indicator Lamps For Rtcc Pannel Green Colour, Mcb Q33q34 415V Ac 3Pole 2A, Mcb Q35 240415V Ac 2Pole 6A, Mcb Q36 240415V Ac 2Pole 10A, Mcb Q37 240V Ac 1Pole 2A, Mcb Q38 240V Ac 1Pole 6A, Mcb Q40 415V Ac 3Pole 10A, Mcb Q41 415V Ac 4Pole 16A, Mcb Q1 To Q8 415V Ac 4Pole 2A, Numerical Relay Ocef Protection7sr 7Sr22032ba870ca0 220 Dc 13Bi14bo, Mcb32a Breaking Capacity 10Ka Rating 32A Pole 2 Voltage 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl42327rc, Mcb16a Breaking Capacity 10Ka Rating 16A Pole 2 Voltage 110V Ac 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl42167rc, Mcb2a Breaking Capacity 10Ka Rating 2A Pole 4 Voltage 110V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl44027rc, Mcb6a Breaking Capacity 10Ka Rating 6A Pole 2 Voltage 220V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl52067rc, Mcb6a Breaking Capacity 10Ka Rating 6A Pole 2 Voltage 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl42067rc, Mcb6a Breaking Capacity 10Ka Rating 6A Pole 1 Voltage 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl41067rc, Mcb4a Breaking Capacity 10Ka Rating 4A Pole 2 Vol 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl42047rc, Mcb25a Breaking Capacity 10Ka Rating 25A Pole 2 Voltage 220V Dc With Fixed Thermal Ol Mgt Sc Release 5Sl52257rc, Mcb6a Breaking Capacity 10Ka Rating 6A Pole 2 Voltage 220V Dc With Fixed Thermal Ol Mgt Sc Release 5Sl52067rc, Lt Auxillary Contactor Knrfkcetkbet3 Air Break In Open Execution 4Pole Auxcontacts 2No2nc Operating Coil 220V Dc 3Th30 220Bm4, Lt Auxillary Contactor Kdc11kdc12 Air Break In Open Execution 4Pole Auxcontacts 3No1nc Operating Coil 220V Dc 3Th30 310Bm4, Lt Auxillary Contactor Kspxktrxksrsk60pklrxkrlxk95ax95bx K60mkbet1kbet2 Air Break In Open Execution 4Pole Auxcontacts 4No Operating Coil 220V Dc 3Th30 400Bm4, Lt Auxillary Contactor K70ak70bk80axk80bxkfaxkb Air Break In Open Execution 4Pole Auxcontacts 2No2nc Operating Coil 220V Ac 3Th30 220Ap0, Power Contactor Q20 Current 9A Voltage 240V Ac 3Pole 3Tf30 100Ap0, Auxillary Contactor Kbet1kbet2 1Nc Auxcontactor Block 3Th30 Contactor 3Tx4 0012A, Auxillary Contactor Kcetkbet2kbet3 1N0 Auxcontactor Block 3Th30 Contactor 3Tx4 0102A, Green Led Lampcomplete Unit H0 Green Led Lampvoltage 220V Dc 3Sb52856he05, Red Led Lampcomplete Unit, H1h13ah13bh14h15ah15b Red Led Lamp Voltage 220V Dc 3Sb52856hc05, Amber Led Lampcomplete Unit H4 Amber Led Lamp Voltage 220V Dc 3Sb52856hl05, White Led Lampcomplete Unit H5ah5bh10 White Led Lamp Voltage 220V Dc 3Sb52856hg05, Blue Led Lampcomplete Unit H6 Blue Led Lamp Voltage 220V Dc 3Sb52856hf05, Yellow Led Lampcomplete Unit H11 Yellow Led Lamp Voltage 220V Dc 3Sb52856hd05, Red Led Lampcomplete Unit H7 Red Led Lamp Voltage 635V Ac 3Sb52356hc14, Yellow Led Lampcomplete Unit H8 Yellow Led Lamp Voltage 635V Ac 3Sb52356hd14, Blue Led Lampcomplete Unit H9 Blue Led Lamp Voltage 635V Ac 3Sb52356hf14, Red Led Lampcomplete Unit H12ah12bh16 Red Led Lamp Voltage 240V Ac 3Sb52856hc03, Mcb6a F22b Breaking Capacity 10Ka Rating 6A Pole 2 Voltage 220V Dc With Fixed Thermal Ol Mgt Sc Release 5Sl52067rc, Mcb16a F20af20b Breaking Capacity 10Ka Rating 16A Pole 2 Voltage 110V Ac 240V Ac With Fixed Thermal Ol Mgt Sc Release 5Sl42167rc, Mcb6a 220 V Ac 6A 50Hz Single Pole Mcb, Lt Auxillary Contactor K70a Air Break In Open Execution 4Pole Auxcontacts 2No2nc Operating Coil 220V Ac 3Th30 220Ap0, Mcb 4P 32Aac, For Pooling Substations