NDW210

NDW210 is a multi-circuit power meter for DIN-rail mounting: one meter covers up to 4 three-phase circuits with split-core CTs up to 600 A included or with the customer’s x/5 CTs. For each circuit it measures voltage, current, active, reactive and apparent power, power factor, frequency, phase angles, unbalance and harmonics up to the 31st, counts energy in 4 quadrants across 4 rates and keeps a 12-month and 31-day history. Accuracy class is 0.5 for voltage and current and 1 for active energy. Data is delivered over RS-485, Modbus-RTU; any Modbus master can poll it: a PLC, a BMS controller, SCADA or a PC. The built-in 2 DI and 2 relay DO report breaker status and control breakers, while the NDW-MK (12 DI + 4 DO) and NDW-TL (12 NTC + 4 leakage current inputs) modules add inputs, outputs, temperature and leakage current monitoring in the panel.

Features

Up to 4 three-phase circuits per meter: split-core CTs up to 600 A included, or connection to x/5 CTs;
Measurement: U, I, P / Q / S, PF, frequency, phase angles, unbalance, harmonics 2 … 31;
Accuracy class: U and I 0.5, active energy 1, reactive energy 2;
4-quadrant energy, 4 rates, 12-month and 31-day history;
2 digital inputs and 2 relay outputs: alarm setpoints, 200-record event log;
RJ45 expansion modules: NDW-MK (12 DI + 4 DO) and NDW-TL (12 NTC + 4 leakage current inputs);
Applications: per-feeder metering in main and distribution switchboards, power quality and harmonics monitoring, breaker status and remote control, temperature and leakage current in panels.

Specifications

General

Wiring	three-phase, 4-wire or 3-wire (3P4W / 3P3W)
Current circuits	1 … 4 three-phase (versions 1S … 4S)
Rated voltage, V	3 × 220 / 380 AC
Rated current with supplied CTs, A	100 / 400 / 600 (D16 / D24 / D36)
Rated current for x/5 CTs, A	5 (D10)
Mains frequency, Hz	45 … 65
Auxiliary power, V	AC/DC 85 … 265
Power consumption, VA	≤ 10
Operating temperature, °C	−20 … +60
Relative humidity, %	≤ 95
Dimensions (H × W × D), mm	87.8 × 72 × 71.5
Mounting	35 mm DIN rail

Measurement and accuracy

Measured values	U, I, P / Q / S, PF, frequency, phase angles, U and I unbalance, THD, harmonics 2 … 31
Accuracy class: voltage, current	0.5
Accuracy class: active / reactive energy	1 / 2
Frequency error, Hz	0.05
Harmonics 2 … 31 error, %	±1
Energy metering	4 quadrants, 4 rates
Energy history	12 months, 31 days
Demand I and P	maximum and real-time
Event log	200 records

I/O and communication

Digital inputs (DI)	2, dry contact, built-in supply
Relay outputs (DO)	2, normally open contact
DO rating, A	3 at AC 250 V or DC 30 V
Pulse output	optocoupler, open collector
Interface and protocol	RS-485, Modbus-RTU (read FC 0x03)
Baud rate	1200 … 38,400 (default 9600)
Frame format	N81, E81, O81, N82 (default N81)
Address	1 … 247 (default 1)
Line termination, Ω	120

Expansion modules

NDW-MK (suffix -MK)	12 DI (dry contact, built-in supply) + 4 DO (relay, normally open contact, 3 A at AC 250 V or DC 30 V)
NDW-TL (suffix -TL)	12 NTC (−20 … +100 °C, ±2 °C) + 4 leakage current inputs (10 … 3000 mA, 1.0 %)
Leakage CT NDW-LCT45	45 mm window, class 1, one per NDW-TL channel
Module connection	RJ45: DC 12 V and Modbus-RTU from the meter; up to one module of each type
Module consumption, W	≤ 1

Documentation

Datasheets

Datasheet PDF

Versions

Part number	Version
NDW210-D16-[S]	Split-core CTs 100 A included, 16 × 17 mm window; S — number of circuits, 1S … 4S.
NDW210-D24-[S]	Split-core CTs 400 A included, 24 × 23.5 mm window.
NDW210-D36-[S]	Split-core CTs 600 A included, 33.5 × 35 mm window.
NDW210-D10-[S]	CTs 5 A (Ø10) included — for the customer’s x/5 CT secondaries.
NDW-MK · -MK	Expansion module: 12 DI + 4 DO, RJ45 connection.
NDW-TL · -TL	Expansion module: 12 NTC + 4 leakage current inputs, RJ45 connection.
NDW-LCT45	Leakage CT for NDW-TL, 45 mm window, one per channel.