DDSY-121YF型单相电子式预付费电子表是我公司开发研制的具有电能计量、负荷控制和用户信息管理等多种功能的新一代产品，该表采用性能优良的美国预付费专用芯片，是当前改革用电体制、实理电能商品化、解决收费难及调节网负荷状态的理想产品。该产品可安装在室内或室外电表箱内，适应于环境温度为-25℃~+60℃，相对湿度不大于85%条件下使用。该产品各项性能指标符合IEC62052-11和IEC62053-21国际标准和GB/T18460.3-2001标准。GB/T18460.3-2001《预付费电度表》标准的全部技术要求。
DDSY-121YF series single-phase electronic prepayment energy meter is developed on the base of excellent single-phase electronic energy meter. It is a new type of IC card pre-paid meter, which has the functions like power measurement, load control and customer information management. This meter adopted high performance American special chip. It is an ideal product for reforming electric system, commercialize the electrical energy, solve the electric charge collection problem and adjusting load status in the electric network. The meter complies with the technical requirements of standard IEC62052-11 and IEC62053-21，GB/T18460. 3-2001，and GB/T18460. 3-2001《 Prepayment Energy Meter》.This meter can installed in indoor or outdoor within the meter box, operating in the ambient temperature -25°C~+60°C relative humidity not exceeding 85%.

 1. International standard IC card encryption pre-charge hardware, the users has to purchase the electricity before use.
 2. High reliability,intelligent anti-theft protection,tamper-proof.
 3. Load control, over-load switching automatically, cut-off power when overload continuously 10-15seconds.
 4. LCD 6+2 digits display
 5. One meter has one card,the card has re-charged function.
 6. The meter can set alarm kwh quantity, and indicated by alarm LED or automatically cut-off when the rest power reached the alarm quantity.
 7. Operation indicated by pulse LED
 8. Save the data automatically when power off.
 9. Anti-theft function, can list the suspected user by analysis the record.
10. Expansible with RS485 or infrared communication for option.