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