Shelly Pro 3EM Switch Add On

Shelly Pro 3EM Switch Add-on

Device identification

  • Device name: Shelly Pro 3EM Switch Add-on

Short description

Shelly Pro 3EM Switch Add-on (the Device) is a galvanically isolated switch that extends the features of the Shelly Pro 3EM series of devices allowing the control of contactors or other electrical appliances.

Main applications

  • Residential

  • MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)

  • Light commercial (small office buildings, small retail/restaurant/gas station, etc.)

  • Agricultural (farms, barns, silos, etc.)

  • Government/municipal

  • University/college

Simplified internal schematics

Shelly Pro 3EM Switch Add-on internal schematics

Device electrical interfaces

Inputs1 load circuit input IOutputs1 load circuit output O Add-on interfaceShelly proprietary serial interface⚠CAUTION! High voltage on the add-on interface when the Device is powered!

Safety features

  • Internal temperature sensing and reporting

Supported load types

  • Resistive (incandescent bulbs, small heating devices)

  • Capacitive (LED light drivers, capacitor banks, electronic equipment)

  • Inductive (contactors, transformers, fans, refrigerators)

User interface

Outputs

  • LED indication

    • Power: Red light if the power supply is connected.

    • Out: Red light if the output relay contact is closed.

Specifications

Type

Value

Physical

Size (HxWxD):

94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in

Weight:

20 ±1 g / 0.70 ±0.05 oz

Mounting:

DIN rail, attached to a Shelly Pro 3EM

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

Environmental

Ambient temperature:

-20 °C to 40 °C / -5 °F to 105 °F

Humidity:

30 % to 70 % RH

Max. altitude:

2000 m / 6562 ft

Electrical

Power supply voltage AC:

N/A

Power supply voltage DC:

3.3 V and 12 V (from Shelly Pro 3EM device)

Power consumption:

< 1 W

Sensors, meters

Internal-temperature sensor:

Yes

Output circuits ratings

Max switching voltage AC:

240 V

Max switching voltage DC:

30 V

Max switching current AC:

2 A

Max switching current DC:

2 A

Basic wiring diagrams

Shelly Pro 3EM Switch Ad-on

Resistive load
Pro-Switch-Add-on-wiring-RC-snubber.png


Inductive load and RC snubber

Legend

Terminals

Wires

O

Load circuit output terminal

L

Live (110-240 V) wire

I

Load circuit input terminal

N

Neutral wire

Components and APIs

Compliance

Printed user guide