The Shelly PRO 3EM-400A is Shelly's second-generation electrical cabinet DIN-rail mounted 3-phase energy meter with a higher performance, max. Version capable of measuring 3 x 400A. Thanks to the LAN connectivity, it can also be installed in places where WiFi reception would be severely limited (e.g. due to a metal cabinet).

The built-in stronger chip and larger memory also enable the running of mJS scripts, and thus the device can operate local automations independently, even without a hub.

Delivered with 3 400A current transformers, Shelly PRO 3EM shows the total consumption data in real time, as well as the instantaneous voltage, current and power per phase, and supports four-quarter consumption measurement.

It can be used in the following cases of use: monitoring of two-way energy measurement (consumption / recharge), local controls, monitoring and control of solar systems. Thanks to the MODBUS support, the PRO version can even be used in industrial facilities.

The Shelly PRO 3EM-400A version is a new, second-generation, more powerful member of Shelly's professional three-phase consumption meter, which is suitable for both private and public use and integration into other systems. It can measure the consumption of circuits, electrical devices, heating or cooling systems or entire households, workshops, and utility plants, it can measure one three-phase circuit or three single-phase circuits, it can measure 3 x 400A max power.

It is capable of measuring and displaying real-time consumption and 60 days of consumption (in offline mode without WiFi), in 1-minute breakdowns, and saving its consumption data per phase.

The Shelly Pro 3EM is a Wi-Fi device with Bluetooth pairing, which is also equipped with a LAN connector. With the 1% energy measurement accuracy of the Shelly Pro 3EM, you can monitor the consumption of any household appliance, electrical circuit and office equipment separately. It saved 60 days of historical data to the device, with a resolution of 1 minute for each phase separately. In addition, script functions allow complex scenes to be executed locally.

Thanks to the LAN connection in the Shelly PRO devices, it also provides many opportunities for professional integrators to create a professional solution. It also shows the current voltage, current and power factor per phase in real time.

Product features:

- 4-quadrant measurement (for capacitive and inductive load types, measures both consumption and recharge)
- Accuracy class B (IEC 62053-21) for active energy: the measurement accuracy of the Shelly Pro 3EM is 1%.
- Supports solar systems: it can measure both consumption and recharging
- Optical pulse indication of energy consumption
- This product version also includes 3 400A current transformers
- MODBUS support: Enables simple and quick installation in existing industrial facilities.
- Wi-Fi, LAN and Bluetooth connection: simultaneous use of Ethernet and Wi-Fi. MQTT, inbound and outbound WebSocket, UDP, mTLS support.
- Power monitoring: It can measure three-phase systems or up to 3 circuits in single-phase electrical systems.
- Fast notifications and storage of at least 60 days of consumption data with 1-minute resolution. Stores data in local memory.
- Script features: Shelly Pro 3PM fully supports the mjS script, allowing you to run local automations as well.
- Industry-grade security Shelly Pro 3EM supports mTLS for MQTT, HTTP and secure outgoing WebSockets. Its industrial-grade security enables direct connection to cloud infrastructure, reducing the cost of deploying complex networks and VPNs.

Wi-Fi connection:

- Like other Shelly devices, Shelly PRO 3EM has a built-in web server, so it can also operate in Access Point mode.
- The Shelly PRO 3EM can also be connected to the home / office / factory Wi-Fi network via a WiFi connection and can be accessed in this way via the free (Android, iOS) Shelly app.
- No central control or gateway is required for its operation, it connects directly to WiFi even in WiFi client or access point mode.
- Supported WiFi protocols: 802.11 b / g / n (2.4 GHz)
- It can work with a fixed IP address and DHCP.
- Shelly Pro 3EM, like other Shelly devices, can work connected to or independently of the Shelly cloud.
- They also cooperate with a home automation system on a home network: they communicate via HTTP and/or UDP protocols from mobile devices, PCs, or other devices.
- Bluetooth pairing: similar to other Shellyi devices belonging to the Plus and Pro product lines, it is easy and quick to pair with Wi-Fi using Bluetooth.

Ethernet connection:

- As a PRO series device, it can be connected not only to Wi-Fi, but also to a wired Ethernet network
- It can work with a fixed IP address and DHCP

Timing functions:

- Recurring timings can be set