Ji Ning Haobo Quality is an eternal theme. The market is the sea, the quality of the ship, the brand is a fan. Today, the quality of tomorrow's market. Build quality Great Wall, Hing Chinese economy. For your business to provide multi-faceted services. The means for intelligent integrated protection devices mine air compressor special magnetic switch covers 380V, 660V, 1140V voltage rating, 5 ~ 400A rated current, all-digital tuning and calibration. With undervoltage | overvoltage | overload | short circuit | equilibrium | leakage lockout protection; with RS485 four remote communication functions; with calendar clock; with fault memory and inquiries; with test functions via the menu. Available with two motors (fans, cooling fans), to complete the phase sequence, oil refining, oil plug, the special protection of high temperatures. Long-term stable and reliable. By EMC testing and proof testing center. Measurement parameters 1, Rated current: 5 ~ 400A 2, rated voltage: 4VAC 3, Rated frequency: 50Hz 4, measurement content: U, I, R 5, Accuracy: ± 3% 6, the switch input methods: optical isolation Use of the environment 1, altitude does not exceed 2000m, pressure is 80kPa ~ 110kPa 2, ambient temperature of -5 ℃ ~ + 55 ℃ 3, ambient air relative humidity less than 95% (+ 25 ℃ when) 4, in the absence of significant damage to insulation The atmosphere in 5 local standards to prevent dripping configure host a current transformer 6 power a set of connectors