NewTrend · bidirectional active-energy metering
Product overview
The DS238 BD is a direct-connected single-phase two-wire active-energy meter for residential, utility and industrial submetering. Its 6+1 digit LCD shows accumulated energy, with reverse active energy included in the total. The 5(100)A input, bottom wiring terminals and choice of DIN-rail or wall mounting suit distribution-board installations.
Technical selection summary
| Model | DS238 BD |
|---|---|
| System | Single-phase two-wire AC |
| Rated voltage | 220–240V AC; illustrated unit 220/230V |
| Voltage reference range | 0.8–1.2 Un |
| Rated / maximum current | 5(100)A; direct connection |
| Frequency | 50Hz or 60Hz, ±10% |
| Accuracy | Class 1 |
| Starting current | 0.004 Ib = 20mA |
| Power consumption | <2W / 10VA |
| Display | 6+1 digit LCD |
| Energy measurement | Bidirectional total active energy; reverse active energy included in total |
| Data retention | More than 15 years after power-off |
| Indicators | Power-on, reverse energy and energy impulse |
| Pulse constant | 1600imp/kWh on the illustrated unit |
| Pulse output | Passive, optically isolated; 80 ±5ms pulse duration |
| AC withstand test | 2000V / 25mA for 60 seconds |
| Enclosure protection | IP20 |
| Operating temperature | −25°C to +55°C |
| Standard marking | IEC62053-21; illustrated unit also marked IEC62052-11 |
| Connection / mounting | Bottom terminals; 35mm DIN rail or three-point wall mounting |
| Dimensions | 93mm high × 80mm wide × 50mm deep |
Display, indicators and terminal connections
The LCD provides six whole-number energy digits and one decimal place. Separate power, reverse-energy and impulse indicators show operating status and energy flow. The passive pulse output uses optical isolation. Energy readings remain stored in non-volatile memory for more than 15 years after the supply is removed.
| Terminal 1 | Line input (L) |
|---|---|
| Terminal 2 | Line output (L′) |
| Terminal 3 | Neutral input (N) |
| Terminal 4 | Neutral output (N′) |
Bidirectional total-energy measurement
The standard version accumulates reverse active energy in the total active-energy reading. A forward-energy-only version can be specially ordered where reverse energy must be excluded from that total. Other voltage, current or function requirements are available by special order.
DIN-rail and wall installation
Fit the rear clip to a 35mm DIN rail, or use the three mounting points for wall installation. The bottom terminals use twin-screw connections. Isolate the circuit before wiring and follow the connection diagram on the meter.
Dimensions
The enclosure measures 93mm high, 80mm wide and 50mm deep.
Typical applications
For energy allocation in homes, shared accommodation, rental property, shops, offices, schools and industrial distribution circuits. The LCD supports local consumption checks and electricity-cost allocation.
