Keypad Prepayment Meter uses digital media as the data exchange media. The pre-purchased kWh will be loaded by user and the settlement will be done in terms of kWh. The meter is equipped with digital keypad interface, which is used for active energy metering & prepayment controlling. Besides the meter also has Infrared communication, RS485 or RS232 communication, metering element, real time clock unit, load control switch and other auxiliaries. Function: When the balance energy value is zero or in overdraft, the disconnection signal is generated for controlling the automatic cutting off of load. The meter will measure automatically when input the new purchased energy. Self-detection and self-diagnose function Event record function (including cover opening event, tamper event and power failure event) Measuring normally when energy reversing Demand calculation Detection & control for user’s power load Applicable conditions: ambient temperature：-25℃ ~ +70℃, storage temperature-40℃ ~ +80℃,maximum relative humidity ：≤95%； Operating voltage range: 0.75Un ～1.30Un the meter can be proper operation under this scope Specifications: Model Accuracy Class Nominal voltage Nominal Current DDSY23S 1.0 220V,230V,240V 5(60)A DTSY23S 0.1 3×220V/380V 5(100)A Technical Parameters Rated Frequency:50Hz No-load Running Current 5mA Impulse Constant ：1600imp/kWh LCD display: 6 integers + 2 decimals Starting current (0.4%Ib) 20mA Weight ： 0.675Kg Power consumption Power consumption of voltage circuit: ≤1W 1.2VA Power consumption of current circuit : ≤0.2VA Size: 162mm×124mm×57mm