Shelly Pro EM-50 Single-Phase Energy Meter
User and Safety Guide
Introduction
This document contains important technical and safety information about the Shelly Pro EM-50 device, its safe use, and installation. Please read carefully before use.
CAUTION! Before beginning installation, read this guide and any accompanying documents carefully and entirely. Failure to follow procedures could lead to malfunction, danger, or legal issues. Shelly Europe Ltd is not responsible for loss or damage due to incorrect installation or operation.
Product Overview
Shelly devices are innovative microprocessor-managed devices for remote control of electric circuits via mobile phone, tablet, PC, or home automation systems. They can operate standalone on a local Wi-Fi network or through cloud services like Shelly Cloud (accessible via Android/iOS app or https://control.shelly.cloud/). Remote access is possible with internet connectivity.
Devices feature an embedded Web Interface accessible at http://192.168.33.1 (AP mode) or the device's IP address on the local network. An API is also provided by Shelly Europe Ltd. For more information, visit: https://shelly-api-docs.shelly.cloud/#shelly-family-overview.
Shelly Pro devices are designed for homes, offices, retail, and manufacturing facilities. They are DIN rail mountable and suitable for new construction. Connectivity options include Wi-Fi, LAN, and Bluetooth for inclusion.
The Shelly Pro EM-50 is a DIN rail mountable single-phase, dual-channel energy meter with a dry contact relay for contactor control. It reports accumulated energy, voltage, current, and power factor in real-time, storing data for at least 60 days with 1-minute resolution.
Schematic and Legend
Fig. 1 Schematic Diagram:
The diagram illustrates the terminal connections for the Shelly Pro EM-50. It shows the placement of two current transformers (CTA and CTB) and the connection points for live and neutral wires, as well as relay outputs and inputs.
Legend:
- Device Terminals:
- [Relay Output O]: Relay output terminal.
- [Relay Input I]: Relay input terminal.
- [Current Transformer A Input IA]: Input for Current Transformer A.
- [Current Transformer B Input IB]: Input for Current Transformer B.
- [Neutral Terminal N]: Terminal for the neutral wire.
- [Live Terminal L]: Terminal for the live (110-240 VAC) wire.
- Cables:
- [Neutral Cable N]: Neutral wire.
- [Live Cable L]: Live (110-240 VAC) wire.
Installation Instructions
CAUTION! Danger of electric shock. Installation must be performed by a qualified electrician.
CAUTION! Ensure no voltage is present at the terminals before making any connection changes.
CAUTION! Use only with power grids and appliances compliant with applicable regulations. Short circuits can damage the device.
CAUTION! Do not connect to appliances exceeding the specified maximum load.
CAUTION! Connect only as shown in these instructions. Other methods may cause damage or injury.
CAUTION! Do not install where the device can get wet.
CAUTION! Connect/disconnect LAN cable only when the device is powered off. The user-touchable parts of the LAN cable must not be metallic.
RECOMMENDATION: Use solid single-core cables or stranded cables with ferrules. Cables should have heat-resistant insulation (min. PVC T105°C / 221°F).
CAUTION! The device and load current circuit must be protected by a cable protection switch (e.g., EN60898-1, tripping characteristic B or C, max. 2 A rated current, min. 6 kA interrupting rating, energy limiting class 3).
Installation Steps:
- Before mounting/installation, turn off breakers and verify no voltage is present using a phase tester or multimeter.
- Install current transformer CTA around one load circuit cable and CTB around another load circuit cable, following Fig. 1.
- Mount the device onto the DIN rail.
- Connect CTA and CTB cables to the device's IA and IB input connectors, respectively.
- Connect the Live cable through a circuit breaker to the L terminal.
- Connect the Neutral cable to the N terminal.
- Verify all connections are correct, then turn on the circuit breakers.
Initial Inclusion
For connection to the Shelly Smart Control mobile app and cloud service, refer to the mobile application guide. The app and cloud service are not required for the device to function.
This device can be used standalone or with other home automation platforms and protocols.
CAUTION! Keep devices for remote control away from children. Do not allow children to play with buttons/switches connected to the device.
LED Indication
- Power: Red light if power supply is connected.
- Wi-Fi (varies):
- Blue light: AP mode.
- Red light: STA mode, not connected to Wi-Fi.
- Yellow light: STA mode, connected to Wi-Fi, but not to Shelly Cloud or Cloud disabled.
- Green light: STA mode, connected to Wi-Fi and Shelly Cloud.
- Flashing Red/Blue: OTA update in progress.
- LAN: Green light if LAN is connected.
- Out: Red light if the relay is closed.
- Count: Red light flashes when the device is measuring energy, frequency dependent on the measured circuit's energy flow.
User Button
- Press and hold for 5 seconds to activate Device AP mode.
- Press and hold for 10 seconds for factory reset.
Specifications
| Parameter | Value |
|---|---|
| Dimensions (HxWxD) | 94 x 19 x 69 mm / 3.70 x 0.75 x 2.71 in |
| Mounting | DIN rail |
| Ambient Temperature | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity | 30 % to 70 % RH |
| Max. Altitude | 2000 m / 6562 ft |
| Power Supply | 110 - 240 VAC, 50/60Hz |
| Electrical Consumption | < 3 W |
| Max. Switching Voltage | 240 VAC |
| Max. Switching Current | 2 A |
| Internal Temperature Sensor | Yes |
| Voltmeters (RMS per phase) | 100 - 260 V |
| Voltmeter Accuracy | ±1 % |
| Ammeters (RMS via CT) | 0 - 50 A |
| Ammeters Accuracy | -±1 % (5 - 50 A) -±2 % (1 - 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 via RPC |
| External Protection | max. 2 A, tripping characteristic B or C, 6 kA interrupting rating, energy limiting class 3 |
| RF Band | 2400 - 2495 MHz |
| Max. RF Power | < 20 dBm |
| Wi-Fi Protocol | 802.11 b/g/n |
| Wi-Fi Operational Range (local conditions) | up to 50 m / 160 ft outdoors up to 30 m / 100 ft indoors |
| Bluetooth Protocol | 4.2 |
| Bluetooth Operational Range (local conditions) | up to 30 m / 100 ft outdoors up to 10 m / 33 ft indoors |
| LAN/Ethernet (RJ45) | Yes |
| CPU | ESP32 |
| Flash | 16 MB |
| Schedules | 20 |
| Webhooks (URL actions) | 20 with 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
Declaration of Conformity
Shelly Europe Ltd. declares that the radio equipment type Shelly Pro EM-50 is in compliance with Directive 2014/53/EU, 2014/35/EU, 2014/30/EU, 2011/65/EU.
The full text of the EU declaration of conformity is available at: https://shelly.link/ProEM-50_DoC
Manufacturer Information
Manufacturer: Shelly Europe Ltd.
Address: 103 Cherni vrah Blvd., 1407 Sofia, Bulgaria
Tel: +359 2 988 7435
E-mail: support@shelly.cloud
Official Website: https://www.shelly.cloud
Changes in contact information are published by the Manufacturer on the official website. All rights to the trademark Shelly® and other intellectual property rights associated with this Device belong to Shelly Europe Ltd.
