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. PIR-8355 digital integrated protection device (hereinafter referred to as protection) is a leading design, the success of the use of advanced microprocessor technology can be applied to intelligent multi-functional integrated protection device containing explosive gas (methane) and coal dust in coal mine , with 380V, 660V, 1140V voltage and current ratings up to 250A of the various types of magnetic starter (switch) supporting the use, in order to achieve a variety of protection functions of the above power supply system, is a very suitable for China's coal industry The new protection device widely used. 1, protection devices equipped with the switch requirements: Rated voltage: AC380V, 660V, 1140V. Current Rating: AC5 ~ 250A. Rated frequency: 50Hz. 2, the protection device parameters: protection measurement unit operating voltage range: AC24 ~ 45V, rated voltage of AC36V. 3, leakage detection circuit: leakage latch circuit voltage DC12V, Current <2mA. ? Ambient temperature is not higher than +65 degrees Celsius, not less than -20 degrees Celsius. Ambient air humidity less than 95% (ambient temperature of +25 degrees C). Not enough to corrode metal and damage the insulation gas environment. No dripping and flooding the place. Host 1 copper three copper braid a semi-cylindrical plastic fixed plugs 2