Single Phase Meters

  • Dedicated metering IC with SMT assembly
  • EMC design for stable field operation
  • Accuracy class 1.0 or 2.0
  • Rated voltage 220V
  • Low power consumption
  • Easy installation
  • IC card prepaid options
  • Stepped-tariff and multi-tariff options
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Product Overview

  • Wanfang single-phase meters are used on 220V single-phase supplies. The range includes an electronic kWh meter, IC card prepaid meters with LED or LCD display, a stepped-tariff meter and a multi-tariff meter.
  • Prepaid models use a standard IC card. One meter works with one card. The meter can show remaining energy and total consumption. When remaining energy is low, the meter can alarm. When the load is too high, the meter can disconnect and then restore power.
  • Common current ratings in this range include 5(20)A, 5(30)A, 5(40)A, 10(40)A, 15(60)A, 20(80)A and 30(100)A, depending on the model.
Model Function Display Prepaid What is different
DDS550 Electronic kWh metering — No Postpaid metering only
DDSY550 Type I 4-digit Prepaid 4-digit LED Yes Two-screen remaining energy; reverse card shows total kWh; auto restore after disconnect
DDSY550 Type I 6-digit Prepaid 6-digit LED Yes Shows total kWh, remaining energy and purchase times
DDSY550 Type II LCD Prepaid LCD Yes LCD display; language can be discussed; insert card to restore power
DDSY550 Stepped-tariff Prepaid + stepped tariff — Yes 3 tariff steps; RS485 and IR reading
DDSF550 Multi-tariff TOU — — 4 tariffs, 8 periods; backup battery
DDS550 Electronic kWh Meter

Electronic active-energy meter for single-phase supplies. Postpaid metering. No prepaid disconnect function.

  • Dedicated IC and SMT assembly
  • EMC design, with EMC integrated as a module
  • High accuracy
  • High reliability
  • Low power consumption
  • Easy installation, with little restriction on mounting position
  • Long service life
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Meter constant 1600imp/kWh, 800imp/kWh
Current 5(20)A, 5(30)A, 10(40)A, 15(60)A, 20(80)A
Frequency 50Hz
Operating temperature -30℃ to +45℃
Relative humidity ≤85%
Power consumption <0.3W
DDSY550 Prepaid Meter, Type I 4-digit

IC card prepaid meter. Remaining energy is shown on two screens. Insert the card in reverse to show total consumption.

  • Dedicated IC and SMT assembly
  • EMC design
  • Standard IC card; low-power magnetic latching relay
  • Remaining energy on two screens; reverse card insertion shows total consumption
  • Buzzer alarm and power-off alarm; power is restored about 5 minutes after disconnect
  • Overload disconnect; power is restored about 3 minutes later
  • One meter, one card
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Meter constant 1600imp/kWh, 800imp/kWh
Current 5(40)A, 10(40)A, 15(60)A, 20(80)A
Frequency 50Hz
Operating temperature -30℃ to +40℃
Relative humidity ≤85%
Power consumption <0.3W
DDSY550 Prepaid Meter, Type I 6-digit

IC card prepaid meter. The display can show total consumption, remaining energy and the number of purchases.

  • Dedicated IC and SMT assembly
  • EMC design
  • Standard IC card; low-power magnetic latching relay
  • Shows total consumption, remaining energy and purchase times
  • Buzzer alarm and power-off alarm; power is restored about 5 minutes after disconnect
  • Overload disconnect; power is restored about 3 minutes later
  • One meter, one card
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Meter constant 1600imp/kWh, 800imp/kWh
Current 5(40)A, 10(40)A, 15(60)A, 20(80)A
Frequency 50Hz
Operating temperature -30℃ to +40℃
Relative humidity ≤85%
Power consumption <0.3W
DDSY550 Prepaid Meter, Type II LCD

IC card prepaid meter with LCD. The display shows total consumption and remaining energy.

  • Dedicated IC and SMT assembly
  • EMC design
  • Standard IC card; low-power magnetic latching relay
  • LCD shows total consumption and remaining energy; display language can be discussed
  • Flashing alarm and power-off alarm; insert the card to restore power after disconnect
  • Overload disconnect; power is restored about 3 minutes later
  • One meter, one card
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Meter constant 1600imp/kWh, 800imp/kWh
Current 5(40)A, 10(40)A, 15(60)A, 20(80)A
Frequency 50Hz
Operating temperature -30℃ to +40℃
Relative humidity ≤85%
Power consumption <0.3W
DDSY550 Stepped-Tariff Meter

Single-phase stepped-tariff meter with IC card prepaid function. Three tariff steps can be set. When consumption reaches the set value, the meter switches to the next tariff. RS485 and infrared interfaces are provided for centralized reading.

  • Dedicated IC and SMT assembly
  • EMC design
  • Standard IC card; low-power magnetic latching relay
  • Functions cover prepaid use by the consumer and management by the utility
  • RS485 and IR interfaces for automatic centralized reading
  • Three stepped tariffs; the meter switches tariff by consumption
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Meter constant 1600imp/kWh
Current 2.5(20)A, 5(20)A, 10(40)A, 15(60)A, 20(80)A, 30(100)A
Frequency 50Hz / 60Hz
Operating temperature -30℃ to +40℃
Relative humidity ≤85%
Power consumption <0.3W
DDSF550 Multi-Tariff Meter

Single-phase multi-tariff meter. Four tariffs and eight time periods can be set. A backup battery keeps the meter working after a power outage.

  • Dedicated IC and SMT assembly
  • EMC design
  • Four tariffs and eight time periods
  • Backup battery for operation after power outage
Item Specification
Accuracy Class 1.0 / Class 2.0
Rated voltage 220V
Frequency 50Hz
Current 5(20)A, 5(30)A, 10(40)A, 15(60)A, 20(80)A
Meter constant 1600imp/kWh, 800imp/kWh
Power consumption <1W
Weight About 0.7kg

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