This series of unipolar vacuum contactors meets the GB14048.4 standard, and the product performance has reached the current high level at home and abroad. This series of vacuum contactors are suitable for AC 50~60Hz, main circuit voltage 1.14~2kV, main circuit rated current from 250A to 800A power network system, for long-distance connection and breaking and frequent start and control of AC motors, transformers and capacitor banks and other occasions, especially suitable for locomotives, wind power, photovoltaic high-power inverter devices as AC side main switch, neutral point grounding protection, cost-effective, is an ideal product to replace imported products.