Wi-Fi energy meter with contactor control
Shelly Pro EM-50 is a single-phase two-channel energy meter for DIN rail mounting. It features an integrated switch with potential-free contacts for contactor control.
- LAN, WLAN, and Bluetooth connection for high security and reliability
- Displays accumulated energy as well as real-time values of voltage, current, active and apparent power per phase.
- 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)
- Suitable for photovoltaic systems
- Stores data in non-volatile memory, retrievable for up to 60 days in 1-minute intervals.
- No hub required! Easy control via the Shelly Smart Control App, most platforms and protocols, as well as voice assistants. Use it with Alexa, Home Assistant, or your preferred automation system.
- Supports scripting, webhooks, MQTT, WebSocket, HTTPS, UDP, TLS, and custom certificates & Modbus TCP protocol
*Package includes 2 pieces of 50 A current transformers
WHY PRO EM-50?
Your smart solution for precise energy monitoring and control
Shelly Pro EM-50A is a DIN-rail mountable single-phase energy meter with an integrated switch for contactor control. With an accuracy of 1% in measuring active energy, the Shelly Pro EM-50 can be used to monitor consumption and control any household appliances, circuits, and office devices. The device features a 60-day data history in 1-minute intervals. Additionally, its scripting functions allow the execution of complex scenes and offer more comprehensive monitoring options.
Functionalities
WLAN, LAN, and Bluetooth connectivity
Simultaneous use of Ethernet and WiFi. MQTT, incoming and outgoing WebSocket, UDP, mTLS support.
Accuracy class B (active energy)
Shelly Pro EM-50 has a measurement accuracy of 1%.
Integrated switch
2 A dry contact switches for contactor control
MODBUS support
Enables easy and quick deployment in existing industrial plants.
Power measurement
Monitors two independent channels on the same phase
Scripting
Shelly Pro EM-50 fully supports mjS scripting, allowing you to create additional features and functions.
APPLICATION EXAMPLES
Perfect for SME owners
If you own a small or medium-sized business, you have probably struggled with excessive energy consumption. Some machines and devices are on all the time. With the Shelly PRO EM-50, you can measure and reduce consumption with the highest precision by turning off consumers like water dispensers, laminators, and lighting at night. The smart device can also be used for preventive measurements by monitoring abnormal behavior of HVAC systems, air compressors, refrigerators, and other devices.
Renewable energy ecosystem at home
If you have a photovoltaic system (PV) at home, Shelly PRO EM-50 can help you measure grid and imported energy from renewable sources. It also features configurable load control, allowing you to redirect excess energy from renewable sources to electronic devices in your home and optimize your energy consumption. For example, you can use the Shelly PRO EM-50 to charge your car or household appliances when your PV system provides surplus energy.
Shelly Smart Control
Shelly Smart Control is here! An app to control your rooms, your energy consumption, and your expenses. Customize your dashboards, get detailed consumption reports, and keep track of your electricity bills.
Full compatibility
Shelly devices are compatible with Alexa, Google Home, Android, and iOS. Together with the voice assistant, you can control Shelly devices with your voice!
Technical data
| FEATURES | ||
|---|---|---|
| Size (HxWxD): | 94x19x69 ±0.5 mm | |
| Weight: | 63 ±1 g | |
| Mounting: | DIN rail | |
| Screw terminal 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) | |
| 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 | |
| Device power consumption: | < 3 W | |
| Rated values of output circuits | ||
| Max. switching voltage AC: | 240 V | |
| Max. switching voltage DC: | N/A | |
| Max. switching current: | 2 A | |
| SENSORS, MEASURING DEVICES | ||
| Internal temperature sensor: | Yes | |
| Voltage meters (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 meter: | 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: | <20 dBm | |
| Wi-Fi protocol: | 802.11 b/g/n | |
| Wi-Fi range: | Up to 30 m indoors and 50 m outdoors | |
| (Depending on local conditions) | ||
| Bluetooth protocol: | 4,2 | |
| Bluetooth range: | Up to 10 m indoors and 30 m outdoors | |
| (Depending on local conditions) | ||
| MCU | ||
| CPU: | ESP32-D0WDQ6 | |
| Flash: | 16 MB | |
| FIRMWARE CAPABILITIES | ||
| Webhooks (URL actions): | 20 with 5 URLs per hook | |
| Scripting: | Yes | |
| MQTT: | Yes | |
| CoAP: | No | |
