4G Three-Phase DIN-Rail Smart Energy Meter DDSU1218

Product Introduction

The DTSU1218 three-phase DIN-rail energy meter is designed to measure single- and three-phase AC active energy at rated frequencies of 50 Hz and 60 Hz. It features functions such as prepayment, load control, RS485 communication, and 4G communication. Its performance specifications comply with the technical requirements for energy meters stipulated in the national standards GB/T 17215.321-2021 and GB/T 17215.322-2022.

Main function

Function name	Function description	Function provide
Measurement of kWh	Total active kWh (positive and negative in total)	■
Measurement ofelectrical parameters	U 、I 、P 、Q 、S 、PF、F	■
Pre-paid mode	prepaid recharge, data encryption	■
Control	Built-in high-capacity sub-holding relay toachieve load on-off control	■
LCDdisplay	8 bits section LCD display	■
Communication	Communication interface: RS485, Communication protocol: MODBUS-RTU、DL/T645-2007	■
Multi-tariff	5 tariffrates, 14 timeintervalbyday	□

(■：means standard;□：means optional)

Note: Pre-paid mode function can only be achieved with the pre-paid system which designed by Acrel Co,. Ltd.

Technical parameter

Technical parameter		DTSU1218
Voltage	Referencevoltage	3×220/380V
	Reference frequency	50Hz
	Consumption	<4VA（Eachphase）
Current	Input current	0.015-0.075（6）A 0.2-0.5（80）A
	Starting current	Connect directly: 0.004Ib, connect via CT: 0.002In
	Consumption	<4VA
Measurementperformance	Accuracy of measuring	1 Class
Clock accuracy		Error ≤0.5s/d
Active pulse	Pulse width	80ms±20ms
Active pulse	Pulse constant	6400imp/kWh, 400 imp/kWh
Communication	Interface	RS485(A+、B-) 4G
	Connection mode	Shielded twisted pair conductors
	Protocol	DL/T 645-2007
Mechanical performance	Outline(Length×Width×Height)	12610075mm
Mechanical performance	Maximumwiringability (flexible cable)	25mm2
Work environment	Workt emperature	-25℃~55℃
	Storage temperature	-40℃~70℃
	Relative humidity	≤95%(Nocondensation)
	Altitude	<2000m

Functional Description

The functions of this product are categorized into two types: standard core functions and optional extended functions. Standard functions constitute the product's default factory configuration, while optional functions require specific customization prior to ordering. Detailed functional descriptions and application scenarios are outlined below:

Energy Metering Function

• **Metering Range:** Supports bidirectional metering of total active energy in three-phase AC circuits. It accurately measures both forward and reverse active energy, thereby meeting the energy metering requirements for scenarios such as grid-tied PV systems and reactive power compensation.

• **Metering Accuracy:** Achieves Class B accuracy for active energy metering and Class 2 accuracy for reactive energy metering. Characterized by minimal metering error, it complies with national standards for high-precision metering.

• **Pulse Output:** Equipped with an active energy pulse output interface, featuring a pulse width of 80 ms ± 20 ms.

Real-time Electrical Parameter Measurement Function

Enables real-time measurement of key electrical parameters within three-phase AC circuits, providing essential data support for power distribution status monitoring and fault diagnosis. Measured parameters include

4G Three-Phase DIN-Rail Smart Energy Meter DDSU1218

Product Introduction

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