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  • New item   Modular three-phase multifunction energy meter | CT-operated …/5 A (…/1 A) | 3×230/400 V | RS485 Modbus | Import / export | DIN | Selec MFM384-R-C-CE
    New item   Modular three-phase multifunction energy meter | CT-operated …/5 A (…/1 A) | 3×230/400 V | RS485 Modbus | Import / export | DIN | Selec MFM384-R-C-CE 1

    Modular three-phase multifunction energy meter | CT-operated …/5 A (…/1 A) | 3×230/400 V | RS485 Modbus | Import / export | DIN | Selec MFM384-R-C-CE

    Code: MFM384-R-C-CE
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    A three-phase multifunction meter for DIN rail, connected via current transformers (…/5 A or …/1 A) and, if needed, voltage transformers. It measures U, I, power, PF, frequency, import and export energy and sends data via RS485 Modbus RTU. Intended for non-billing (internal) metering.

  • Product description

    Modular three-phase multifunction energy meter | CT-operated …/5 A (…/1 A) | 3×230/400 V | RS485 Modbus | Import / export | DIN | Selec MFM384-R-C-CE

    The Selec MFM384-R-C-CE is a three-phase multifunction meter for DIN rail, connected via current transformers. This is the DIN version (90 × 70 mm), not the 96 × 96 mm panel-mount MFM384. It is designed for higher-current feeders where a direct-connected meter is no longer suitable.

    Key point:
    Programmable CT ratio (primary up to 10 kA, secondary 1 A or 5 A) and PT ratio let the same device be used from a small board to a large substation. One unit shows voltages, currents, power, PF, frequency, import and export energy and power demand, and sends all data to SCADA or BMS via RS485 Modbus RTU.
    Current input
    …/5 A or …/1 A (max. 6 A)
    CT primary
    up to 10 kA
    Interface
    RS485 Modbus RTU
    Energy class
    1
    ⇄
    Bidirectional metering
    Yes. The manufacturer specifies import and export metering of active, reactive and apparent energy. It measures energy imported from and exported to the grid – both directions are counted separately. The data is for internal control, as this CE version has no MID. Compatibility with inverter power / export control must be confirmed separately – bidirectional metering alone is not enough.

    Communication interfaces and integration

    RS485 Modbus RTU
    Reading of all measured values into SCADA, BMS, PLC or an energy monitoring system. 300–19200 bps, parity none/odd/even, addresses 1–255, line length up to 500 m – many meters on one bus.

    Operating principle

    The meter mounts on a 35 mm DIN rail. Current circuits connect via current transformers (5 A or 1 A secondary), voltage directly up to 300 V L-N or via voltage transformers; auxiliary supply 85–270 V AC.

    The CT and PT ratios and wiring configuration are set in the menu, and the device scales the measured values to actual primary-side values.

    The backlit LCD shows real values for each phase and the energy registers, and the same data is sent to your system via Modbus RTU.

    Why choose the Selec MFM384-R-C-CE?
    One compact device replaces voltmeters, ammeters and an energy meter: high-current feeders are measured via standard CTs and the data is immediately available via Modbus.

    Technical specifications

    Product type Modular three-phase multifunction energy meter (CT-operated)
    Manufacturer / model Selec / MFM384-R-C-CE
    Connection Via current transformers; voltage direct or via voltage transformers
    Current input Nominal 5 A AC (min. 11 mA, max. 6 A)
    CT ratio Secondary 1 A / 5 A (programmable), primary up to 10 kA
    PT ratio Primary 100 V–500 kV, secondary 100–500 V (programmable)
    Measuring voltage 11–300 V AC (L-N), 19–519 V AC (L-L); suitable for 3×230/400 V networks
    Auxiliary supply 85–270 V AC, 50/60 Hz, max. 8 VA
    Wiring configurations 3P-4W, 3P-3W, 2P-3W, 1P-2W
    Accuracy U and I ±0.5 % FS, power 1 %, energy – class 1
    MID No (CE version) – for non-billing (internal) metering
    Measured values U (L-N, L-L), I, f, PF, active / reactive / apparent power, min./max. power demand
    Energy Active, reactive, apparent – import and export
    Interface RS485 Modbus RTU, 300–19200 bps, address 1–255, up to 500 m
    Pulse output None
    Display 3-line backlit LCD
    Mounting / dimensions 35 mm DIN rail, 90 × 70 × 66.3 mm
    Weight 208 g
    Operating conditions -5…+60 °C (storage -20…+75 °C), up to 85 % RH
    Standards IEC 61326-1, CE

    Main functions

    • Programmable CT and PT – one model for various currents up to 10 kA and medium-voltage measurement via PT.
    • Import and export – separately for active, reactive and apparent energy.
    • Full network picture – U, I, P, Q, S, PF and frequency per phase and total.
    • Power demand – min./max. active and reactive power values for assessing peaks.
    • RS485 Modbus RTU – integration into SCADA, BMS or PLC.
    • 10-year energy memory – register values are retained during power loss.

    How does it differ from similar models?

    Eastron SDM630MCT Also CT-operated with RS485 Modbus, but has MID. Choose it if the data is used for billing.
    Eastron SMART X96-1 96 × 96 mm panel meter via CT with MID – mounted in the panel door. The MFM384-R-C-CE mounts on a DIN rail.
    Schneider PowerLogic PM5110 / PM5330 Panel-mount power analysers via CT with broader analysis. The MFM384-R-C-CE is a more compact DIN solution for the main parameters.
    Selec EM4M-3P-C-100A Direct connection up to 100 A with 2 tariffs and 2 pulse outputs. The MFM384-R-C-CE is needed when current exceeds 100 A.

    Where is it used?

    • Incoming and main distribution boards with high currents
    • Transformer substations and medium-voltage incomers (via PT)
    • Monitoring of industrial feeders and large equipment
    • Control of solar PV generation and export
    • Energy monitoring of commercial buildings in BMS
    • Generator and backup power feeders
    • Power factor correction equipment and PF control

    Use by need

    Electrical designers.
    One model for different CT ratios – easier to standardise specifications across boards.
    Automation integrators.
    Standard Modbus RTU with programmable baud rate, parity and address.
    Energy engineers and facility managers.
    Clear data on power, PF, peaks and energy in both directions.

    Practical use

    If the plant incomer has 400/5 A current transformers and you need to see actual loads and energy in SCADA, install the MFM384-R-C-CE next to them on a DIN rail, set CT primary 400 A and secondary 5 A in the menu, and let the system read currents, power, PF and import/export energy via RS485 Modbus RTU.

    Pros

    • Programmable CT (up to 10 kA) and PT (up to 500 kV) ratio
    • Import and export for all three energy types
    • Compact 90 × 70 mm DIN housing
    • RS485 Modbus RTU up to 500 m
    • Backlit 3-line LCD
    • Supports 3P-4W, 3P-3W, 2P-3W and 1P-2W configurations

    Cons / limitations

    • No MID – for billing choose the Eastron SDM630MCT or SMART X96-1.
    • Separate current transformers are required – not included.
    • No pulse output or tariffs – if you need them up to 100 A, choose the Selec EM4M-3P-C-100A.
    • Requires a separate 85–270 V AC supply; the manufacturer does not state an IP rating – install in an enclosed panel.

    Safety and installation notes

    • Installation must be carried out by a qualified electrician with the supply disconnected and verified dead.
    • Never open the CT secondary circuit while current flows in the primary – short it first.
    • Protect the voltage measurement and supply circuits with fuses or circuit breakers.
    • Observe CT polarity (P1/P2, S1/S2) and phase matching – otherwise power and energy direction will be wrong.
    • Run the RS485 line in shielded twisted pair with 120 Ω terminators at both bus ends.

    Quick selection guide

    CT …/5 A or …/1 A
    CT up to 10 kA
    Import / export
    RS485 Modbus RTU
    Suitable when you need:
    • to measure feeders with currents above 100 A
    • to send network parameters to SCADA or BMS via Modbus
    • a compact DIN meter instead of a panel meter
    Check before use:
    • that you have suitable current transformers (5 A or 1 A secondary)
    • that you do not need MID (billing metering)
    • that an 85–270 V AC supply is available in the panel
    Important reminder: The MFM384-R-C-CE does not replace the grid operator's billing meter and is not a protection relay – it only measures and transmits data.

    FAQ

    Is it a DIN or panel meter?
    It is the DIN rail version (90 × 70 × 66.3 mm), not the 96 × 96 mm panel MFM384.
    What does 6 A mean?
    It is the maximum CT secondary current; nominal input is 5 A, while the load can be up to 10 kA depending on the CT.
    Can it be used with …/1 A current transformers?
    Yes, the secondary current is programmable as 1 A or 5 A.
    Does the meter have MID?
    No, this is the CE version for internal metering.
    Does it measure energy exported to the grid?
    Yes, it records imported and exported energy separately; check compatibility with inverter export control separately.
    Is there a pulse output?
    No, data is transmitted only via RS485 Modbus RTU.

    Wiring diagram via current transformers

    Selec MFM384-R-C wiring diagram via current transformers, 3 phases 4 wires

    Click the diagram to open it larger. Marked: ① current transformer wiring, ② voltage measurement, ③ auxiliary supply, ④ RS485.

    ⚠ This diagram is for guidance only and may contain inaccuracies. Before connecting, check against the manufacturer's instructions and the device markings.
    The qualified electrician carrying out the installation is responsible for it. UAB „Elektrotechnikos sprendimai“ accepts no liability for connections or possible errors.

    Most common wiring mistakes

    • CT installed backwards (P1 on the load side) or S1/S2 swapped – negative power, energy counted as export.
    • CT and voltage input taken from different phases – wrong power and cos φ; the total may be close to zero.
    • CT ratio not set in the menu (e.g. 200/5) or 1 A selected instead of 5 A – readings wrong by a fixed factor.
    • CT secondary opened under load – dangerous voltage at the terminals and possible CT damage. Short-circuit it before disconnecting.
    • N (terminal 16) not connected in a 3-phase 4-wire system – distorted phase voltages and power values.
    • Auxiliary supply (18–19) connected between two phases (400 V) – exceeds the 85–270 V AC limit and damages the device.
    • RS485 A+/B− swapped or no 120 Ω terminator at the end of the line – no communication or intermittent data.
    • CT secondary wires too thin or too long – the CT is overburdened and measurement error increases.

    Documents and sources

    Diagram prepared on 2026-10-01 from the manufacturer's instructions. It is for information only – follow the manufacturer's instructions and applicable electrical installation rules when installing.

    Selec MFM384-R-C-CE – DIN multifunction meter via CT

    Three-phase multifunction DIN meter via current transformers (…/5 A or …/1 A, up to 10 kA) with import/export metering and RS485 Modbus RTU – for internal metering of high-current feeders.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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