Hello everyone. Franciscan Ninghao Bo long-term focus on DKZB-400Z Feed Switch intelligent integrated protection. The company advocates "professional. Pragmatic Efficient Innovation" spirit of enterprise. Has a sound R & D strength and maturity of the service team. Our aim is: "with the service and sincere exchange for your trust and support of mutual benefit and win-win..!" My company is willing to cooperate with domestic and foreign colleagues Chester create the future quality of survival, reputation.! development, DKZB-400Z Feed Switch intelligent integrated protection and cheap, product quality and safety of your relationship with me, DKZB-400Z Feed Switch intelligent integrated protection safety first, quality first, buy DKZB-400Z feed Intelligent integrated protection switch look Shandong Haobo, not expensive, only buy! 186 * 1368 * 7339 below me tell you about the DKZB-400Z Feed Switch intelligent integrated protection if you have any questions about the product can contact me directly: 186-1368-7339 landline: 0537-232-9989 QQ: 232-545-4811 Di Jingli a basic parameters 1, Rated voltage: 1140V, 660V, 380V 2, Rated current: 200A, 400A, 500A, 630A, 800A, 1000A 3, integrated protection device power standard frequency: 50Hz . 4, comprehensive protection system for long-term work. Second, the working conditions 1, no more than 2000 meters above sea level 2, ambient temperature -5? С ~ + 40? С 3, air relative humidity less than 95% (+ 25? С) 4, in the absence of strong vibration and shock vibration 5 environment, containing methane and coal dust in the air, but it not enough to corrode metal and damage the insulation gas and steam environment 6, feed switch installed in explosion-proof chamber. Third, the function 1, overload 1.1, the load current exceeds the overload current setting of 1.1 times the nominal value, started inverse delay. Load current exceeds the setting value multiples greater the shorter the time the action. 1.2, overload current and delay time of inverse time characteristics meet the following one: Table 1: Table overload inverse time overcurrent delay time 1.05 × Ie 2h initial state does not act cold 1.20 × Ie 0.2 ~ 1h hot 1.50 × Ie 90 ~ 180s hot 2.00 × Ie 45 ~ 90s hot 4.00 × Ie 14 ~ 45s hot 6.00 × Ie 8 ~ 14s Cold representative Ie which feed switch setting on the rated current. 2, short-circuit protection greater than or equal tuning "short circuit multiples" reached the actual current, short-circuit signal from this device to confirm a protection signal is correct, the operating time of less than 100ms. 3, 3.1 selective leakage protection, protection devices should be equipped with delay links all levels of differential time delay 250 ~ 300ms. 3.2, at rated voltage, insulation resistance network is infinite, distributed capacitance of 0.22 ~ 1.0uf (phase), the single-phase ground 1KΩ resistance, the compensation of not less than 60% efficiency. 3.3, selective leakage protection action resistance values ??to zero sequence current transformer for the sector, the power supply side and the load capacitance of the capacitor take six measurements in Table II resistance movement, in the case of each set capacitance, when the supply voltage 75% to 110% of rated, single-phase operation provides resistance load table III.