Three-Phase Energy Meter up to 65 A Wallbox

The Wallbox 000002174 three-phase energy meter is a meter for three-phase electrical installations designed to directly measure currents of up to 65 A and provide the Wallbox charging system with the information needed for different energy management functions. The reference corresponds to the model identified by Wallbox as MTR-3P-65A / EM340-PRO380 and is installed on DIN rail, occupying 3 modules.

Thanks to RS485 communication with compatible Wallbox chargers, the meter provides real-time insight into the installation’s consumption and uses this information for functions such as Power Boost, dynamic power management, and compatible solar charging solutions. Its direct measurement avoids the use of current transformers or external clamps in installations that do not exceed the 65 A supported by the device.

Three-phase meter up to 65 A

The Wallbox 000002174 reference is specifically designed for three-phase installations and supports a maximum continuous current of 65 A.

Measurement is carried out directly through the meter itself, so the phase conductors pass electrically through the device without the need for external current clamps.

• Installation type: three-phase.
• Measurement type: direct.
• Base current: 5 A.
• Maximum current: 65 A.
• Minimum specified current for the EM340 family: 0.25 A.

EM340 / PRO380 model

Wallbox explicitly identifies this reference as Power Meter EM340 / PRO380, Three Phases, 65 A.

The EM340 is a three-phase energy analyzer designed to measure both energy and different electrical variables in the installation and transmit them to the control system.

Its integration with Wallbox chargers allows the charging infrastructure to adapt its behavior to the power available in the building.

Compatible with Power Boost

One of the meter’s main applications is use with Power Boost in compatible Wallbox chargers.

Power Boost uses the measurement of the building’s overall consumption to dynamically adjust the power available for charging the electric vehicle.

When the home or installation increases its consumption, the charger can reduce the power allocated to the vehicle. When other loads decrease, the system can increase charging power again within the configured limits.

This helps make better use of the available electrical power and helps prevent the combined consumption of the building and the vehicle from exceeding the configured installation limit.

Dynamic load management

The meter provides electrical information to the Wallbox ecosystem for use in dynamic energy management functions in compatible installations.

In infrastructures with multiple chargers, Wallbox offers solutions such as Dynamic Power Sharing or equivalent dynamic management systems, capable of distributing the available power among different charging points.

Final compatibility depends on the charger model, installation configuration, and enabled software features.

Compatible with solar charging solutions

The EM340 is one of the meters used by Wallbox for its energy management solutions compatible with photovoltaic production, historically known as Eco-Smart and now integrated into the Solar Charging functions of the Wallbox ecosystem.

In a compatible installation, the system can use the information provided by the meter to determine the home’s energy flow and manage vehicle charging according to the available energy.

The specific functions and charging modes available depend on the Wallbox charger and the version of the energy management system installed.

RS485 communication

Communication between the meter and compatible Wallbox chargers is carried out via RS485.

In the EM340, this communication uses the Modbus RTU protocol, allowing the electrical values measured by the meter to be transmitted to the management system.

Wallbox shows the EM340 connection in its installation documentation through the corresponding terminals for:

• A- / RS485.
• B+ / RS485.
• GND.
• Bus termination.

Installation and configuration of the RS485 network must be carried out following the diagram corresponding to the Wallbox charger used.

Active and reactive energy measurement

The EM340 technical platform can measure different quantities related to electrical consumption.

Available parameters include:

• Active energy: kWh.
• Reactive energy: kvarh.
• Active power: kW.
• Reactive power: kvar.
• Apparent power: kVA.
• Line-to-line voltage: VLL.
• Line-to-neutral voltage: VLN.
• Current: A.
• Power factor: PF.
• Frequency: Hz.

The device can work with total system information and with different variables corresponding to each phase.

Imported and exported energy measurement

The EM340 family can differentiate between energy consumed from the grid and exported energy, a particularly useful feature when the installation includes photovoltaic generation.

This capability allows the energy management system to receive information about the direction of power flow.

Direct connection 5(65) A

The meter uses a current input specified as 5(65) A, meaning a base current of 5 A and a maximum continuous current of 65 A.

As a direct-connection meter, it does not require external current transformers to operate within this range.

For three-phase installations with higher currents, Wallbox offers indirect measurement meters with clamps for larger ranges.

Three-phase voltage from 208 to 400 V line-to-line

The EM340 platform is designed for networks with a measurement voltage of 208 to 400 V AC line-to-line.

It can be used in compatible three-phase systems with 3 or 4 conductors depending on the electrical configuration and connection scheme established by the manufacturer.

Self-powered from the measured grid

The EM340 is a self-powered meter from the electrical voltage it is measuring, so it does not need an independent auxiliary power supply for normal operation.

The specified own consumption for the EM340 family is up to approximately 1 W / 10 VA.

Backlit LCD display

The meter includes a backlit LCD display that allows the main electrical values to be checked directly from the panel.

The EM340 design uses three rows of eight digits and touch zones to navigate through the different information pages and parameters.

In addition to integrated operation with Wallbox, this display is useful during commissioning, inspection, and maintenance of the installation.

DIN rail mounting

The Wallbox 000002174 is designed to be installed in electrical panels on DIN rail.

It occupies 3 DIN modules, so the corresponding space must be reserved inside the electrical enclosure.

The EM340 platform dimensions are approximately:

• Width: 54 mm.
• Height: 90 mm.
• Depth: 63 mm.

The weight of the EM340 meter is approximately 240 g including packaging, according to the analyzer manufacturer’s datasheet.

IP51 front protection

The EM340 family has:

• Front protection: IP51.
• Terminal protection: IP20.

The meter is intended for installation inside a suitable panel or electrical enclosure, so the final protection rating of the installation will depend on the cabinet used.

Accuracy for energy monitoring

The EM340 meets accuracy specifications for professional electrical measurement.

• Active energy: class 1 according to EN 62053-21.
• Active energy: class B according to EN 50470-3 for the corresponding variants.
• Reactive energy: class 2 according to EN 62053-23.
• Current and voltage accuracy: up to ±0.5% of reading under the conditions specified by the manufacturer.

Important: reference 000002174 must not be confused with the EM340 MID

Wallbox sells both standard EM340 meters and EM340 MID versions. The 000002174 reference is identified by Wallbox as MTR-3P-65A / EM340-PRO380 three-phase 65 A, while the current accessory documentation presents the EM340 MID version as a separate category.

Therefore, the MID certification intended for fiscal or billing measurement should not be automatically attributed to reference 000002174 without expressly verifying that the supplied unit corresponds to a certified variant.

Technical features of Wallbox 000002174

• Brand: Wallbox.
• Reference: 000002174.
• Product code: MTR-3P-65A.
• Associated model: EM340 / PRO380.
• Type: energy meter.
• Electrical installation: three-phase.
• Measurement type: direct.
• Rated/base current: 5 A.
• Maximum current: 65 A.
• EM340 family voltage: 208-400 V AC line-to-line.
• Mounting: DIN rail.
• Width: 3 DIN modules.
• EM340 dimensions: approximately 54 x 90 x 63 mm.
• Communication with Wallbox: RS485.
• Protocol: Modbus RTU.
• Display: backlit LCD.
• Active energy measurement: yes.
• Reactive energy measurement: yes.
• Per-phase measurement: yes.
• Imported/exported energy measurement: yes.
• Power Boost: compatible in supported Wallbox systems.
• Eco-Smart / Solar Charging: compatible depending on charger and configuration.
• Dynamic Power Sharing: compatible depending on Wallbox infrastructure.
• Front protection: IP51.
• Terminal protection: IP20.
• Self-powered: yes.

Wallbox meter to optimize electric vehicle charging

The Wallbox 000002174 allows the consumption measurement of the three-phase installation to be integrated with compatible Wallbox chargers, providing the information needed to adapt vehicle charging to the energy actually available.

Its direct measurement up to 65 A, compact 3 DIN module format, and RS485 communication make it a particularly suitable solution for domestic and professional three-phase installations where Power Boost, solar charging functions, or dynamic power management systems are desired.

Installation must be carried out by a qualified professional and following both the meter diagram and the specific documentation for the Wallbox charger with which it will be used.