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Shelly Pro 3EM Technical Specifications

Shelly Pro 3EM

Technical Specifications

Connection

AC Supply Voltage	110 - 240 V, 50/60 Hz
DC Supply Voltage	N/A
Neutral wire required	Yes

Functions

Measurement Inputs	4 transducer inputs
Over-temperature protection	Yes
Ambient temperature	-20 °C to 40 °C
Humidity	30% to 70% RH
Voltage meter (RMS for each phase)	100 - 260 V
Voltage meter accuracy	±1%
Current meters (RMS via CT for each phase and neutral conductor)	0 - 120 A
Current meter accuracy	±1% (2 - 120 A), ±2% (1 - 2 A), ±5% (0 - 1 A)
Power and Energy Meter	Active and reactive power; Power factor; Basic active and basic reactive energy
Measurement data storage	At least 60 days with a data resolution of 1 minute
Data export	CSV for recorded PQ values, JSON format export via RPC
Device self-consumption	< 3 W

Frequency

RF band

2.4 MHz

Connectivity

Max. RF power	<20 dBm
WLAN Protocol	802.11 b/g/n
WLAN Range	Up to 30m indoors and 50m outdoors (depending on local conditions)
Bluetooth Protocol	4.2
Bluetooth Range	Up to 10m indoors and 30m outdoors (depending on local conditions)

MCU

CPU	ESP32-D0WDQ6
Flash	16 MB

Firmware Capabilities

Webhooks (URL actions)	20 with 5 URLs per hook
Scripting	mJS
MQTT	Yes
CoAP	No

Properties

Current transformers	3 x CT120 included in the package
Dimensions (HxWxD)	94x19x69 ±0.5 mm
Weight	62 ±1 g
Mounting	DIN rail
Screw terminal max. torque	0.4 Nm
Conductor cross-section	0.5 to 2.5 mm² / 20 to 14 AWG (Solid, stranded, and ferruled conductors)
Length of stripped conductor	6 to 7 mm
Device material	Plastic
Color	White
Max. altitude	2000 m

*Subject to change

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