... function: overload,short circuit,phase failure 3 phase imbalance high quality Product summaryATQD series small power control cabinet is well- ... functions of overload, short circuit, phase failure, three-phase unbalance, shortage of water,ectWorking condition1 Power: three-phase four-wire system 380V(-15%~+10%), ... pump stop and jury pump start,etc. Small power control box/control cabinet/control panel