Shelly PRO 3EM Switch Add-On DIN Rail Expansion Module for Contactors
The Shelly PRO 3EM Switch Add-On is a galvanically isolated switching module designed exclusively to expand the capabilities of the Shelly Pro 3EM three-phase energy meter. This DIN-rail mountable add-on provides dry contact switching for controlling contactors, relays, and other electrical appliances, enabling advanced load control and energy-based automation for residential, commercial, and industrial applications. Perfect for solar PV systems, energy management, and smart building automation in Australia.
Why You'll Love the Shelly PRO 3EM Switch Add-On
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Galvanically Isolated Dry Contacts: Safely control external contactors and electrical devices with potential-free switching up to 240V AC / 30V DC at 2A.
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Seamless DIN-Rail Integration: Attaches directly to the Shelly Pro 3EM for compact, professional installation in switchboards and electrical panels.
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Energy-Based Automation: Automatically switch appliances on or off based on real-time energy consumption, generation thresholds, or schedules.
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Solar & Renewable Energy Ready: Optimise solar PV systems by controlling loads when excess energy is generated, reducing grid dependency.
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Professional-Grade Reliability: Operates in demanding environments from -20°C to +40°C with a compact, durable design.
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5-Year Warranty: Shelly Pro devices come with a generous 5-year manufacturer warranty for peace of mind.
Smart Energy Automation for Solar & Beyond
When paired with the Shelly Pro 3EM, this add-on unlocks intelligent load management. Use real-time data to automatically activate water heaters, EV chargers, or HVAC systems when your solar panels are producing surplus energy. Conversely, shed non-essential loads during peak demand or low generation periods to save on electricity costs. Controlled via the Shelly Smart Control app (iOS & Android), you can create custom scenes, schedules, and automation scripts without needing a hub.
Flexible Control for Contactors & Electrical Devices
The add-on provides one load circuit input (I) and one load circuit output (O) with potential-free dry contacts, making it compatible with a wide range of resistive, capacitive, and inductive loads. Control contactors for high-power appliances, activate relays, or integrate with building management systems. The module is powered directly from the Shelly Pro 3EM via a proprietary serial interface, consuming less than 1W.
Professional Installation & Monitoring
Designed for electricians and installers, the Shelly PRO 3EM Switch Add-On features screw terminals (0.5-2.5mm² / 20-14 AWG) with a maximum torque of 0.4 Nm. LED indicators provide instant status feedback: a red Power LED confirms power supply, and a red Out LED indicates when the relay contact is closed. Internal temperature sensing ensures safe operation and reporting.
Applications
- Solar PV and renewable energy load balancing
- Commercial and industrial energy management
- Multi-dwelling units (apartments, condominiums, hotels)
- Agricultural and municipal installations
- Smart building automation and contactor control
What's in the Box
- Shelly PRO 3EM Switch Add-On module
- DIN rail mounting bracket
- User and safety guide
Full Specifications
Physical
| Dimensions (H × W × D) |
94 × 19 × 69 mm (±0.5 mm) / 3.70 × 0.75 × 2.71 in |
| Weight |
20 g (±1 g) |
| Mounting |
DIN rail (attached to Shelly Pro 3EM) |
| Shell Material |
Plastic |
| Colour |
White |
Electrical
| Power Supply |
3.3 VDC and 12 VDC (from Shelly Pro 3EM) |
| Power Consumption |
< 1 W |
| Max Switching Voltage AC |
240 V |
| Max Switching Voltage DC |
30 V |
| Max Switching Current AC |
2 A |
| Max Switching Current DC |
2 A |
| Potential-Free Contact |
Yes (dry contacts) |
| Load Types |
Resistive, Capacitive, Inductive |
Connectivity & Interface
| Connection to Shelly Pro 3EM |
Shelly proprietary serial interface |
| Load Circuit Inputs |
1 (I terminal) |
| Load Circuit Outputs |
1 (O terminal) |
| Screw Terminals Wire Cross-Section |
0.5 to 2.5 mm² / 20 to 14 AWG |
| Screw Terminals Max Torque |
0.4 Nm / 3.54 lbf·in |
| Wire Strip Length |
6 to 7 mm / 0.24 to 0.28 in |
Environmental
| Ambient Temperature |
-20°C to +40°C / -5°F to +105°F |
| Humidity |
30% to 70% RH |
| Max Altitude |
2000 m / 6562 ft |
Features
| Internal Temperature Sensing |
Yes |
| LED Indicators |
Power (red), Out (red) |
| Compatibility |
Shelly Pro 3EM only |
| Control App |
Shelly Smart Control (iOS & Android) |
| Hub Required |
No |
Compliance & Warranty
| CE Compliance |
2014/35/EU, 2014/30/EU, 2011/65/EU |
| Warranty |
5 years (Shelly Pro devices) |
Specifications are sourced from the manufacturer product page and may be updated.
