Single phase prepaid energy meter type DDSY999 is used to measure 50HZ AC active energy, it is a new generation of intelligent instrument, combination advanced integrated solid technology and SMT crafts. The performance accords with International Standards IEC61036-2000. It features advanced principle, simple construction, high accuracy and sensitivity, long service life, strong overload and anti-power theft, alarming of remainder, storing data over 20 years, setting secret, etc.

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