... as below:-Instrument Transformer Tester, Model ITC-C,-Standard reference CT, Model HL-62CS-Current load box , ... fault and the ratio mistake. Technical Specifications: Instrument Transformer Tester, Model ITC-C -Input: Power Frequency: ... over 150A. -Standard current ratio: ² Primary:5,7.5,10,15,20,25,30,40,50,60, ... <80%(25°C) -Altitude :< 2500m High Accuracy Current Transformer Calibrating Tester/Testing