General
Type	Value
Electrical
Power supply voltage AC	100 - 260 V, 50/60 Hz
Power supply voltage DC	N/A
Power consumption	< 3 W
External protection	Tripping characteristic B or C, , 16A max. rated current, , min. 6 kA interrupting rating, , energy limiting class 3
Environmental
Ambient temperature	-20 °C to 40 °C / -5 °F to 105 °F
Humidity	30 % to 70 % RH
Max. altitude	2000 m / 6562 ft
Firmware capabilities
Webhooks (URL actions)	20 with 5 URLs per hook
Scripting
MQTT
CoAP
MCU
CPU	ESP32-D0WDQ6
Flash	16 MB
Physical
Size (HxWxD)	94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in
Weight	62 ±1 g / 2.19 ±0.05 oz
Mounting	DIN rail
Screw terminals max torque	0.4 Nm / 4.43 lbin
Conductor cross section	0.5 to 2.5 mm² / 20 to 14 AWG (solid, stranded, and bootlace lugs)
Conductor stripped length	6 to 7 mm / 0.24 to 0.28 in
Shell material	Plastic
Color	White
Radio
RF band	2400 - 2495 MHz
Max. RF power	<20 dBm
Wi-Fi protocol	802.11 b/g/n
Wi-Fi Range	Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors , (Depends on local conditions)
Bluetooth Protocol	4.2
Bluetooth Range	Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors , (Depends on local conditions)
Sensors, meters
Voltmeters (RMS for each phase)	100 - 260 V
Voltmeters accuracy	±1 %
Ammeters (RMS via CT for each phase and the Neutral)	0 - 120 A
Compatible CT	CT 120A
Ammeters accuracy	±1 % (2 - 120 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A)
Power and energy meters	Active and apparent power Active and apparent energy Power factor Fundamental active and fundamental reactive energy
Channel-to-channel calibration minimum load	500 W per channel
No load threshold	30 VA per channel
Measurement data storage	At least 45 days of 1 min data resolution
Data export	CSV for PQ recorded values JSON format export through RPC
Internal-temperature sensor

The Shelly Pro 3EM 120A v2 is a DIN-rail mountable 3-phase energy meter with integrated WLAN, Bluetooth, and LAN connectivity, specifically designed for precise measurement of energy consumption and generation in single-phase and three-phase electrical systems. The device enables 4-quadrant measurement, allowing accurate tracking of both consumption and generation (e.g., from photovoltaic systems). With a measurement accuracy of up to 1 % and active energy accuracy class B (compliant with IEC 62053-21, based on manufacturer tests), it represents a reliable standard for professional energy management applications. The Photovoltaic-Ready function makes it ideal for installations with renewable energy sources. An integrated data logging system stores measurement values in non-volatile memory at 1-minute intervals, enabling analysis of up to 60 days of historical data. The optical pulse indicator visualizes energy consumption in real time. The device is supplied with three 120 A current transformers and can measure up to 120 A per phase as well as the neutral conductor. Phase sequence error detection (optional) supports fault diagnosis during installation. Matter-ready compatibility enables future integration into modern, standardized smart home and industrial networks.