Energy meters

Electricity meters and energy metering devices for apartments, houses, businesses and industrial sites. Choose from single-phase and three-phase direct-connected meters, meters connected via current transformers (CT), MID-certified models, meters with RS485 Modbus, M-Bus, Ethernet or Wi-Fi, bidirectional and multi-tariff models.

Single-phase meters Three-phase meters ⚡ Three-phase via CT ⚡ Single-phase via CT

Read more

Electricity meters – how to choose the right one

The right meter depends on three things: the supply current, the network (1 or 3 phases) and where the data has to go. Below you will find a quick selection guide, an overview of the groups, a separate section on CT-connected meters and the most common mistakes.

Colour key:blue – informationgreen – benefit and suitabilityorange – ⚠ checkred – ⚡ dangerous voltagepurple – communication

Quick selection by situation

Situation	What to choose	Where to look
Apartment, cottage or a separate single-phase line	Single-phase direct-connected meter	Single-phase meters
House, workshop or line with a three-phase supply up to 100 A	Three-phase direct-connected meter	Three-phase meters
Current above 100 A or CTs already installed in the panel	⚡ Meter connected via current transformers	Three-phase via CT
Single-phase line where current is measured via a CT	⚡ Single-phase meter via CT	Single-phase via CT
Data must reach SCADA, BMS or a PLC	Meter with RS485 Modbus RTU	Eastron SDM630 Modbus V2, Selec MFM384-R-C
Tenants are invoiced from the readings	MID-certified meter	Eastron SDM72D-M-MID, Schneider iEM3150
Import and export must be measured	⇄ Bidirectional meter	Eastron SDM630 Modbus V2, EL-TVPS3-80T
Direct current: EV charging, batteries	DC energy meter	DC 1000 V / 100 A

Groups in this category

Single-phase electricity meters →
For apartments, cottages and separate single-phase lines. Direct connection, models with MID, Modbus and Wi-Fi. E.g. Eastron SDM120D-MID, THORGEON 01001.

Three-phase electricity meters →
For houses, workshops and company lines up to 100 A: from simple kWh meters to multifunction meters with RS485 Modbus, M-Bus and several tariffs. E.g. Eastron SDM630 Modbus V2, ELGAMA GAMA 300 G3E.144, Zamel LEM-30.

⚡ Three-phase via current transformers (CT) →
For high-current supplies, power distribution boards and building energy monitoring. Modular, multi-channel and panel-mount devices.

⚡ Single-phase via current transformers (CT) →
For single-phase lines where current is measured via a transformer.

DC meters and AC/DC indicators →
For direct-current circuits (EV charging, battery systems) and panel voltage / current / power indicators. They are listed in this group.

⚡ Meters with current transformers (CT)

When the line current exceeds 100 A or the meter has to be installed in an existing power board, it is connected via current transformers. The CT reduces the line current to a standard 5 A or 1 A secondary current, and the meter recalculates it using the ratio set in the menu (e.g. 400/5). This way a single meter can measure a line of hundreds or thousands of amperes.

When to choose
Supply or line current above 100 A; CTs already installed in the panel; metering in the main power board or monitoring of several lines.

How to select a CT
Primary current – by the maximum line current with a margin; secondary (5 A or 1 A) – the same as the meter input; the CT window must fit the cable or busbar.

How to connect
P1 – on the supply side, S1 → start of the meter current input, S2 → end. Each phase has its own CT, and the phase sequence must match the voltage inputs.

ℹ A sample wiring diagram with terminal numbers and the most common mistakes – see the Selec MFM384-R-C description.

Model	Connection	Communication	Features
Eastron SDM630MCT	Modular, …/1 A or …/5 A	RS485 Modbus RTU, 2 pulse outputs	Multifunction, ⇄ import / export, THD
Eastron SDM630MCT-2T	Modular, …/1 A or …/5 A	RS485 Modbus RTU	2 tariffs, MID
Selec MFM384-R-C	Modular, …/5 A (…/1 A), primary up to 10 kA	RS485 Modbus RTU	⇄ Import / export, programmable PT ratio
Carlo Gavazzi EM21 72D	Modular, …/5 A, CT ratio up to 999	RS485 Modbus RTU, pulse	Removable display, DIN or panel mounting
ELGAMA GAMA 300 G3A.147	Transformer-operated, 5(10) A	Depends on version	1 (C110) or 2 (F11) tariffs
VEXEN ES3100DCT	Modular, x/5 A, primary 1–9999 A	Pulse output	Simple kWh metering
THORGEON 01004	Modular, 1.5(6) A via …/5 A CT	Pulse, 400 imp/kWh	Simple kWh metering, 1 tariff
Schneider PM5110 / PM5330	Panel 96×96, via CT	RS485 Modbus RTU	Power analyser: power, energy, THD
EARU EASEM-G-TY-W	Modular, 3 CTs included (80–1000 A)	Wi-Fi (Tuya), RS485	⇄ Bidirectional, voltage and current protection
TAC4371CT	Modular, CT 100 / 150 / 200 A	Ethernet / Modbus	⇄ Bidirectional, LCD display
ME431Q4-2	Four-channel, DIN	Modbus RTU / TCP, web server	Several lines in one device
MC60-GW30, 36-circuit meter	Multi-channel, DIN, via CT	RS485 Modbus	Many lines – one device
Panel 96×96 with Rogowski coil	Panel, Rogowski coil	RS485 Modbus	Accuracy class 0.5S

⚡

⚡ Dangerous voltage
An open CT secondary under load produces a dangerously high voltage and can damage the transformer. Always short-circuit the CT secondary terminals (S1–S2) before disconnecting the meter.

Communication interfaces – how the data reaches your system

Interface	Suitable for	Examples
Pulse output (S0)	Simple energy counting to a PLC, controller or data logger	THORGEON 01004, VEXEN ES3100DCT
RS485 Modbus RTU	SCADA, BMS, PLC, EV charger and other controller systems	Eastron SDM630 Modbus V2, Selec MFM384-R-C, Eastron SDM72D-M-MID
M-Bus	Building metering systems with an M-Bus network	VEXEN ESM3100DMB
Ethernet / Modbus TCP	Direct connection to the local network	TAC4371CT, ME431Q4-2
Wi-Fi (Tuya / Smart Life)	Monitoring in a mobile app, smart home	EARU EASEM-G-TY-W, EL-TVPS3-80T
4G / LoRa	Remote sites without a local network	ESADW300, LoRa multi-channel meter

⚠ What to check before buying

Parameter	What to check	Why it matters
Connection type	Direct or via CT (…/5 A, …/1 A)	Direct-connected meters usually handle up to 80–100 A; higher currents need CTs
Current In / Imax	E.g. 5(80) A, 10(100) A	Imax must not be lower than the supply protection current
Voltage and network type	230 V; 3×230/400 V; 3P4W or 3P3W	Wrong type – wrong readings
Accuracy class	B (1), 0.5S	Larger sites and analysis need a more accurate class
MID	Yes / no	Required when billing is based on the readings
Tariffs	1, 2, 4 or more	When the price depends on the time of day
Energy direction	Single-direction or ⇄ bidirectional	For import and export metering
Communication	S0, Modbus, M-Bus, Ethernet, Wi-Fi	Must match your system
Mounting	DIN modules or panel 96×96 mm	For planning space in the board

⇄

Bidirectional metering
A bidirectional meter measures energy imported from and exported to the grid. Compatibility with inverter power / export control must be confirmed separately – bidirectional metering alone is not enough for that.

⚠ Most common selection and wiring mistakes

Mistake	Consequence
✗ Direct-connected meter chosen for a current above its Imax	Terminals overheat, the meter fails
✗ CT installed backwards or S1/S2 swapped	Negative power, energy counted as export
✗ CT and voltage input from different phases	Wrong power and cos φ
✗ CT ratio not set in the menu	Readings wrong by a fixed factor
✗ ⚡ CT secondary opened under load	Dangerous voltage, CT damage
✗ Meter without MID used for billing tenants	Readings are hard to justify on invoices
✗ RS485 A+/B− swapped or no 120 Ω at the end of the line	No communication or intermittent data

⚡ Safe installation

⚡ Meters must be installed and connected only by a qualified electrician, with the power switched off and absence of voltage verified.
⚡ A CT secondary must never be opened under load – short-circuit the CT terminals before disconnecting the meter.
Tighten the terminals of direct-connected meters to the torque specified by the manufacturer – a loose contact overheats.
Protect the voltage measuring circuits according to the manufacturer's instructions.
Follow the applicable electrical installation rules.

Frequently asked questions

What is the difference between a direct-connected and a CT-connected meter?
A direct-connected meter carries the full load current, so it is usually rated up to 80–100 A. A CT-connected meter measures only the 5 A or 1 A secondary current, so it suits lines of hundreds or thousands of amperes.

Is MID certification required?
If tenants or other consumers are billed from the readings, choose a MID model. MID is not required for internal energy monitoring.

Which CT ratio should I choose?
Choose the primary current by the maximum line current with a margin, e.g. 250/5 or 300/5 for a 250 A supply. The ratio is set in the meter menu.

Can the meter be connected to SCADA or BMS?
Yes, if it has an RS485 Modbus RTU, M-Bus or Ethernet (Modbus TCP) interface. Check the register map and communication settings.

Is a bidirectional meter suitable for inverter export limitation?
It measures energy imported from and exported to the grid, but compatibility with a specific inverter's control must be confirmed separately.

How much space does a meter take in the board?
Single-phase modular meters usually take 1–2 DIN modules, three-phase meters 4 or more. Panel devices are mounted in a 96×96 mm cut-out.

Need help choosing?

Send us the supply current, network type and where the data needs to go – we will select the right meter and, if needed, the current transformers. All meters are delivered in Lithuania, Latvia and Estonia.