Do not forget to link up the phase indicator ( undercurrent relay ) and maximum relay when allocate the power switch . Inside is installed AC contactor thermal replay self-settable conversion switch .
风机安置电源开关时，必须安置电源缺相 保护或热 继电器。内装交流接触器、热继电器、自复位万能转换开关或按钮等。
Application of Undercurrent Relay to Circuit of Tower Crane
欠 电流 继电器在塔机电路中的作用
欠电流继电器，欠流继电器