NEM-6L24

NEM-6L24 is a three-phase energy submetering module for DIN-rail mounting with external current transformers up to 100 A. It measures voltage, current, active, reactive and apparent power, power factor, frequency and energy per phase with accuracy class 1 % and delivers the data over Modbus-RTU via RS-485 or UART TTL with galvanic isolation. Any Modbus master can poll it: a PLC, a BMS or SCADA controller, a PC or a gateway. The module is used for energy submetering of HVAC and ventilation units, measurement and verification of energy savings, BMS and SCADA integration and retrofits of existing switchboards.

Features

Per-phase measurement: U, I, P / Q / S, PF, frequency, energy;
Accuracy class 1 % across all measured values;
Modbus-RTU over RS-485 and UART TTL, galvanically isolated;
External CTs up to 100 A — solid-core or split-core;
Ultra-low self-consumption — 0.3 W typ., powered from the mains;
Non-volatile energy counters up to 399,999,999.9 kWh;
Applications: energy submetering of HVAC and ventilation units, measurement and verification of energy savings, BMS / SCADA integration, retrofits of existing switchboards.

Specifications

General

Wiring	three-phase, 3- or 4-wire
Voltage range, V	50 … 566
Nominal voltage, V	220 / 380
Current range, A	0 … 100, via external CTs
Line frequency, Hz	45 … 65
Accuracy class, %	1
Self-consumption, W	0.3 typ. / 2 max.
Operating temperature, °C	−20 … +60
Dimensions, mm	116 × 76 × 27.8
Mounting	35 mm DIN rail
Weight, g	107 (PCB 51)

Outputs and isolation

CF pulse output	open drain, 10 ms pulse, 1000 imp/kWh
RS-485 / UART isolation	galvanic
Current inputs	3 external CTs, solid-core or split-core
Voltage inputs	L1, L2, L3, N

Measurement

Power P / Q / S per phase	0 … 38 kW / kvar / kVA
Power factor	0 … 1, resolution 0.01
Active energy, kWh	up to 399,999,999.9
Reactive and apparent energy	kvarh and kVAh
Phase angles	0 … 360°, resolution 0.01°

Communication and addressing

Protocol	Modbus-RTU, 8N1 + CRC-16
Interfaces	RS-485 and UART TTL (3.3 / 5 V)
Baud rate, bit/s	2400 … 115,200 (default 9600)
Address	1 … 247 (default 1), by DIP switch or software
Reference / maximum current, A	Ib 10 / Imax 100
Line frequency, selectable	50 or 60 Hz

Documentation

Datasheets

Datasheet PDF

Versions

Part number	Version
NEM-6L24-100C	Kit of 3 solid-core CTs, 100 A.
NEM-6L24-100S	Kit of 3 split-core (clamp-on) CTs, 100 A.