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: HHD1-2, 3. HHD2-A~G 2. Working power: 220VAC, 380VAC 50Hz 3. Curent range: HHD1-2: 20~100A / HHD1-3 100~200A; HHD2-A~G: A type: 1~2. 5A. B type: 2~5A C type: 4~10A D type: 8~20A E type: 16~40A F type: 32~80A G type: 63~160A 4. Protect funcion: Phase-failure protect, over-current protect, 3-phase Imbalance protect. 5. Diplay type: LED display maximum current 6. Display accuracy: 2. 0 class 7. Contact type: 1 NC (HHD1-2, 3). Solid electronic switch output(HHD2-A~G) 8. Setting-up type: Setting-up current of potentiometer(HHD2-A~G) 9. Contact capacity: 5A 380VAC(resistence)(HHD1-2, 3) 1A 380VAC(resistence)(HHD2-A~G) 10. Outline size: 64x154x162mm(HHD1-2, 3); 39x90x63mm(HHD2-A~G) 11. Mounting type: Device type