Selec MFM384-R-C Multifunction Meter
Selec MFM384-R-C Multifunction Meter | 3-Phase, RS-485, True RMS
Advanced 3-phase True RMS multifunction meter with RS-485 Modbus RTU, programmable CT/PT, THD monitoring, pulse output, max demand, and Class-1/Class-0.5S accuracy for industrial and commercial energy monitoring.
The Selec MFM384-R-C is a high-performance 96×96 mm 3-phase multifunction meter designed for electrical panels, industrial systems, commercial buildings, and energy management applications. It measures true RMS voltage, current, power, energy, power factor, frequency, max demand, and THD. Equipped with RS-485 Modbus RTU, programmable CT/PT ratios, and pulse output, it offers reliable integration into BMS, EMS, PLC, and SCADA systems.
Key Features
3-phase True RMS measurement
Works with 3Ø-3W, 3Ø-4W, 2W, 1Ø-2W systems
Measures V, I, PF, Frequency, Active/Reactive/Apparent Power
Class-1 / Class-0.5S energy accuracy
THD measurement up to 31st harmonic
Max demand calculation for power
RS-485 Modbus RTU communication
Pulse output for energy monitoring/PLC interfacing
Programmable CT/PT primary/secondary
Phase sequence and CT polarity detection
User-configurable display scroll modes
IP54 (front) protection, LCD with backlight
Compact 96×96 panel mount
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MFM384-R-C |
| Display | LCD with backlight, 4 rows |
| Voltage Range | 11–300V L-N, 19–519V L-L |
| Voltage Accuracy | ±0.5% of FS |
| Current Input | 5A nominal |
| Current Accuracy | ±0.5% of FS |
| CT Primary | 1 / 5 A to 10,000 A (programmable) |
| CT Secondary | 1A or 5A |
| PT Primary | 100 V to 500 kV |
| PT Secondary | 100–500 V |
| Energy Accuracy | Class-1 Active, Class-2 Reactive |
| Power Factor Accuracy | ±0.01 |
| Frequency Range | 45–65 Hz |
| THD | Up to 31st harmonic |
| Pulse Output | 24 V DC max, 100 mA |
| Pulse Weight | 1–9,999,000 pulses/kWh |
| Communication | RS-485, Modbus RTU |
| Baud Rate | 1200 / 2400 / 4800 / 9600 / 19200 |
| Device ID | 1–255 |
| Isolation | 2 kV RMS |
| Mounting | Panel 96×96 mm |
| Protection | IP54 (front) |
| Operating Temperature | –10°C to 55°C |
| Weight | ~300g |
Applications
Industrial energy monitoring
Commercial building load measurement
LT/HT electrical panels
SCADA/PLC/BMS integration (Modbus RTU)
DG set energy monitoring
Harmonic analysis for PQ improvement
Sub-metering for industries and facilities
What’s in the Box?
1× Selec MFM384-R-C Multifunction Meter
1× Mounting clamp kit
1× User manual
1× Warranty card
FAQ (4–6)
Q1: Does MFM384-R-C support Modbus?
Yes, it supports RS-485 Modbus RTU with baud rates from 1200 to 19200 bps.
Q2: Does it measure THD?
Yes, total harmonic distortion measurement is available up to the 31st harmonic.
Q3: Can I use it with a single-phase supply?
Yes, it supports 1Ø-2W and 2Ø-3W configurations.
Q4: What CT ranges are supported?
1A/5A secondary and primary up to 10,000A (programmable).
Q5: Is pulse output available?
Yes, it provides a 24V DC, 100 mA pulse output suitable for PLC/BMS.
Q6: What is the energy accuracy?
Class-1 for active energy, Class-2 for reactive energy.