Energy cost meter AC Shelly Pro 3EM-400A 400 A 50-60 Hz

Shelly Pro 3EM-400 is a DIN-rail mountable three-phase energy meter with Wi‑Fi, Bluetooth and LAN connectivity. It reports accumulated active energy as well as instantaneous voltage, current and power factor per phase in real time. The device offers 1% active energy measurement accuracy, 60 days of on-device historical data with 1‑minute resolution per phase, and scripting capabilities for advanced monitoring and automation. Its compact form factor (19 mm width, 69 mm depth, 94 mm height) and 400 A maximum current rating make it suitable for residential and small commercial installations.

Advantages

The Shelly Pro 3EM-400 provides precise three-phase monitoring with 1% accuracy for active energy and real-time per-phase measurements of voltage, current and power factor. Built-in Wi‑Fi, Bluetooth and LAN connectivity enable flexible integration into local networks and professional systems. On-device historical storage for up to 60 days with 1‑minute granularity and scripting support allow detailed analysis and customized automation without immediate cloud dependency. DIN-rail form factor and compact dimensions simplify installation inside distribution boards.

Suitable for

• Monitoring household energy consumption and individual appliances
• Measuring electrical circuits in small businesses and offices
• Integration into professional automation and energy management systems
• Retrofit installations inside DIN-rail electrical panels

Key specifications

• Model: Shelly Pro 3EM-400 (MPN 217050, EAN 3800235268117)
• Type: Three-phase AC energy meter, DIN-rail mountable
• Max current: 400 A
• Frequency: 50–60 Hz
• Measurement accuracy: 1% (active energy)
• Connectivity: Wi‑Fi, Bluetooth, LAN
• Historical data: Up to 60 days on-device, 1-minute resolution per phase
• Dimensions: 19 mm (W) × 69 mm (D) × 94 mm (H)
• Weight: 0.062 kg

How to use

Install the Shelly Pro 3EM-400 on a standard DIN rail inside the distribution board and connect the three-phase conductors following local electrical regulations and the product wiring diagram. Connect the device to the local network via Wi‑Fi or LAN for remote monitoring and configuration, or use Bluetooth for initial setup. Use the Shelly management interface to view real-time readings, review historical data, configure scripts and set up integrations with home automation or energy management platforms.

Recommendations

Follow applicable national and local electrical codes when installing and wiring the meter. Ensure connections are made by a qualified electrician and verify the device is rated for the installation's maximum current. Regularly back up any required historical data if long-term storage is needed beyond the on-device 60-day period.