... cover,iron base,short terminal cover 3.IEC62053-21 DD862 single phase mechanical power meteris a kind of induction meter, ... able to be anti-reverse;♦The bearing has four kinds: single-jewel, dual-jewel, magnetic thrust ;♦The die-casing frame ... operation, two types wiring optional, standard or special one;♦Single component measures single-phase two-wire active energy consumption,Complying with standard ...