Product Introduction

The DDS238-4 W is a single‑phase 3‑wire AC active energy meter designed for bi‑directional energy measurement in grid‑tied systems such as solar PV monitoring. It operates at 110/220V with a rated current of 10(100)A. The meter features an LCD display with keypad navigation for step‑by‑step viewing of phase voltage, L1/L2 current, active power, frequency, total/import/export active energy, and reactive energy. Bi‑directional active energy measurement (import/export) is supported. Communication is via RS485 using MODBUS‑RTU protocol (default 9600bps, address 1‑247, 8 data bits, no parity, 1 stop bit). A passive pulse output with optical coupling isolation and an LED indicator provide consumption pulsing. Non‑volatile memory retains energy data for over 15 years without power. The meter mounts on a 35mm DIN rail with bottom‑terminal wiring, complies with IEC62053‑21 and DIN 43880, and offers Class 1 or 0.5% accuracy. With an AC withstand voltage of 4000V and IP20 rating, it is suitable for industrial/commercial applications requiring RS485 data logging and MODBUS integration.

Product Data Sheet

Product model: DDS238-4 W

Type: Single‑phase 3‑wire AC active energy meter

Rated voltage: 110/220V AC (L1‑L2 range: 90‑300V)

Rated current: 10(100)A

Overload capacity: 30×Imax for 0.01s

Start current: 40mA

Frequency: 50/60Hz ±10%

Accuracy: Class 1% or 0.5%

Display: LCD with keypad navigation

Measurement parameters: Phase voltage, L1/L2 current, active power, frequency, total/import/export active energy, reactive energy

Bi‑directional measurement: Yes (import/export)

Communication: RS485, MODBUS‑RTU (9600bps, address 1‑247, 8 data bits, no parity, 1 stop bit)

Pulse output: Passive, optical coupling isolation, pulse width 80±5ms, LED indicator

Data retention: >15 years (non‑volatile memory)

Mounting: 35mm DIN rail, bottom‑terminal wiring

AC withstand voltage: 4000V/25mA for 60s

IP rating: IP20

Power consumption: <2W / <10VA

Standards: IEC62053‑21, DIN 43880

Operating temperature: -25°C to +70°C

Application: Grid‑tied systems (solar PV monitoring), industrial/commercial RS485 data logging and MODBUS integration