it constitutes controlling circuit of electrical motor with AC contactor and other switching apparatus. when abnormal working condition occured in the main circuit of electrical motor, such as phase failure,overload,block,3-phase imbalance,leakage and so on. the motor protector will make contacts of switching appratus swithed off immediately, disconnect 3-phase power of electrical motor to achieve result of motor protection quickly and safely. Main feature: 1. Type: HHD5-A, HHD5-B, HHD5-C, D, E 2. Working power: 3-phase 380VAC 50Hz 3. Protect function: Phase sequence protect, Phase-failure protect, voltage Imbalance protect. 4. Contact type: 1NO and 1NC 5. Contact capacity: 5A 380VAC(resistence) 6. Outline size: 57x41x78mm(HH5-A), 78x49x82mm(HHD5-B) 82x45x110mm(HHD5-C, D, E) 7. Mounting type: 35mm rail ( HH5-A, HHD5-C, D, E). Device type(HHD5-B) 8. Alternative product: APR-3, JVM-1, XJ2, XJ3, XJ5