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Advanced 3 Phase Portable Relay Protection Test Set for Accuracy. Wide Output Range: 3-phase AC current up to 40A, voltage up to 120V AC L-N. Comprehensive Testing: Supports harmonic superposition, power direction, and differential tests. Flexible Power Supply: Customized AC input (220V/230V/120V) with 50/60 Hz frequency. Reliable Performance: Over 5,000 units sold since 1999 with low maintenance costs. Professional Support: Includes on-site training and 3-year warranty coverage. PC Control Interface: Serial port available for PC control and updated testing software. Certified Manufacturer: ISO 9001/14001 certified with 35 R&D engineers and own lab.