DDSY23(III) Electronic Single-phase Prepayment Watt-hour Meter is used to measure single-phase energy with 50/60Hz rated frequency, It realizes the functions of prepayment management and load control that pay of energy first&use it afterwards.

 Full electronic single-phase active energy measurement.
  Protecting against tamper & fraud.
 Prepayment management system by use of IC card to commercialize energy so as to pay for it first & use it afterwards.
 Scrolling display energy consuming information which is convenient for user.
 Warning when residual energy is deficient to remind users of purchasing energy in time.
 Large LCD screen display both cumulative energy & residual energy at the same time.
  Delay trip at overload automatically.
 IC card adopting ISO standard IC card.
 Overdraft function can be set by overdraft card.
  Adopting large-scale special IC with industrial class design & high accuracy.
 Special large capacity meter reading card with high accuracy.
 One meter with one IC card which adopts special security measures to ensure the security and reliability of data.
  Special Setting Card and Meter-replacing Card are convenient for registration and
  maintenance of management department.
  Adopting check & error correction measures in the software to ensure the data's validity &  reliability.
 Reading back energy consuming data automatically through IC card, convenien
  for management.
 Adopting power failure treatment technique to ensure the data being kept for 10 years.