General
Type	Value
Electrical
Power supply voltage AC	100 - 260 V, 50/60 Hz
Power supply voltage DC	N/A
Power consumption	< 3 W
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
Output circuits ratings
Max switching voltage AC	240 V
Max switching voltage DC	N/A
Max switching current	2 A
Physical
Size (HxWxD)	94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in
Weight	63 ±1 g / 2.22 ±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
Voltmeter (RMS)	100 - 260 V
Voltmeters accuracy	±1 %
Ammeters (RMS via CT)	0 - 50 A
Ammeters accuracy	±1 % (5 - 50 A), ±2 % (0 - 5 A)
Power and energy meters	Active and apparent power Active and apparent energy Power factor
Measurement data storage	At least 60 days of 1 min data resolution
Data export	CSV for PQ recorded values JSON format export through RPC
Internal-temperature sensor

Wi-Fi energy meter with contactor control Shelly Pro EM-50 is a single-phase, two-channel, DIN rail mounted energy meter. It has an integrated switch with potential-free contacts for contactor control. LAN, WLan and Bluetooth connection for high security and reliability. Displays the accumulated energy as well as the instantaneous values of voltage, current, active and apparent power per phase in real time. Power measurement - two independent measurement channels for the same phase 4-quadrant measurement with optical pulse display of energy consumption Measurement accuracy Class B (IEC 62053-21) Photovoltaic suitable Stores the data in non-volatile memory, which can be used at 1-minute intervals for up to 60 days can be retrieved. No hub required! Easy control via the Shelly Smart Control app, most platforms and protocols, and voice assistants. Use it with Alexa, Home Assistant or your favorite automation system. Supports scripting, webhooks, MQTT, WebSocket, HTTPS, UDP, TLS and custom certificates FEATURES Size (HxWxD): 94x19x69 ±0.5 mm Weight: 63 ±1 g Mounting: DIN rail Screw terminals Max. torque: 0.4 Nm / 4.43 lbin Cross section of Conductor: 0.5 to 2.5 mm² / 20 to 14 AWG (solid, stranded and bootlace lugs) Length of stripped conductor: 6 to 7 mm / 0.24 to 0.28 in Housing material: Plastic Color: White ENVIRONMENTAL Ambient temperature: -20 °C to 40 °C Humidity: 30% to 70% RH Max. altitude: 2000 m CONNECTION Supply voltage AC: 110 - 240 V, 50/60 Hz Supply voltage DC: N/A Internal consumption of the device: SENSORS, MEASURING DEVICES Internal temperature sensor: Yes Voltmeter (RMS) : 100 - 260 V Accuracy of voltage meters: ±1% Current meters (RMS via CT): 0 - 50 A Accuracy of current meters: ±1% (5 - 50 A), ±2% (0 - 5 A) Power and energy meters : Active and apparent power Active and apparent energy Power factor No load threshold:: 30 VA per phase Storage of measurement data: At least 60 days with a data interval of 1 minute Data export: CSV for recorded PQ values JSON format export through RPC CONNECTIVITY RF band: 2400 - 2495 MHz Max. RF power: MCU CPU: ESP32-D0WDQ6 Flash: 16 MB FIRMWARE CAPABILITIES Webhooks (URL actions): 20 with 5 URLs per hook Scripting: Yes MQTT: Yes CoAP: No