... short terminal cover 3.IEC62053-21 DD862 single phase mechanical power meteris a kind of induction meter, which is applicable to ... has the features of tight structure design, high overload, low power loss, long service life, specious appearance, etc.FUNCTIONS AND FEATURES ... four kinds: single-jewel, dual-jewel, magnetic thrust ;♦The die-casing frame is alloy aluminium or adopts top-quality steel plate ...