Carlo Gavazzi ET340 three-phase energy meter

Overview
The ET340 is a highly accurate three-phase transducer from the Italian manufacturer Carlo Gavazzi.
The transducer measures active and reactive energy, summing (easy connection mode on) or separating imported energy from exported energy.
A run-hour meter is available to link the energy to the relevant working hours.
The device is suitable for active energy metering and for cost allocation in applications up to 65 A (with a direct connection), with support for dual tariff management.
It can measure imported and exported energy or be programmed to consider only the imported one.

Application
We highly recommend using the Carlo Gavazzi ET340 for use with Victron-based photovoltaic systems, as a more budget-friendly alternative to the Carlo Gavazzi EM530 (as it is both cheaper, and doesn't require external current transformers).
It can be used as a grid meter to control the input of an ESS system, it can measure the output of photovoltaic inverters or AC generators, and can be used as an AC meter to measure the output of an inverter/charger.
The device is fully supported out-of-the-box by VenusOS, the operating system running on Victron GX devices, such as the Cerbo GX and Cerbo-S GX
It can be connected using the RS485 to USB interface, or Zigbee to USB and Zigbee to RS485 converter.

Communication options
The ET340 supports RS485 Modbus communication using the screw terminals on the front panel (please refer to the user manual for the correct configuration when using the RS485 to USB interface).
It features dual RJ45 connectors, which also support Modbus, however they should not be used with Victron equipment.
The energy meter also supports optical infrared communication, which can be used by coupling the device with the Carlo Gavazzi OptoProg optical interface.

Design and mounting
The device is designed for indoor use (IP20 protection rating) in standard electrical panels with a DIN rail, and measures three DIN modules in width.
The operational temperature range is -25 to +65 °C, and the maximum (non-condensing) humidity is 90% at 40 °C.
Supports cables with a cross section from 2.5 to 16mm², with or without ferrules, the screw terminals for communication support cables with a cross section of 1.5 mm².
For more information on mounting, wiring and torque numbers for the screw terminals, please refer to the manual.

Accuracy
Active energy: Class 1 (EN62053-21)
Reactive energy: Class 2 (EN62053-23)
The measurement accuracy is ±0.5% RDG (V, A), and the meter is rated Class B (kWh) according to EN50470-3 and Class 1 (kWh) according to EN62053-21.

For more information, please refer to the technical documentation and manuals for the device, which can be found on this webpage.