Sudharsan Insulation , Chennai, (Sec. Inj. Over Current Relay Test Kits, Heavy AC Current Injection Sources, Primary Injection Test Kits, 3 Phase Injection Current Source, Loading Transformers, Static Phase Shifter, MCB Test Kit, MCCB Test Kit, MCB/MCCB Test Kit, RCCB Test Kit, Digital Phase Angle Meter, Digi-Phase Analyzer, Time Interval Meter, Electrical Test Bench Trolley, H.V. AC / DC Source)