... the main circuit of electrical motor, such as phase failure,overload,block,3-phase imbalance,leakage and so on. the motor ... make contacts of switching apparatus switched off immediately, disconnect 3-phase power of electrical motor to achieve result of motor protection ... : HHD5-G, HHD5-12. Working power: 3-phase 380VAC 50Hz(HHD5-G); 220VAC 50Hz(HHD5-1)3. Protect function: Over-pressure protect, ...