Shelly
Shelly Pro EM - 50
Shelly Pro EM - 50
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Shelly Pro EM-50 — DIN-Rail 2-Channel Single-Phase Energy Meter
Professional, DIN-rail mountable energy metering with LAN, Wi-Fi and Gen2 firmware flexibility. The Shelly Pro EM-50 is a compact two-channel single-phase energy meter designed for installers, integrators and commercial/residential projects that require accurate metering, local logging and flexible integrations (MQTT, HTTP, WebSocket) with TLS security for inbound connections.
Why choose Shelly Pro EM-50?
- DIN-rail form factor — slim profile for distribution boards and control cabinets.
- Two independent channels — measure two circuits or two load points with per-channel real-time metrics.
- Multiple connectivity options — Wi-Fi, Ethernet and Bluetooth; operate standalone on a LAN or integrate with cloud/home automation platforms.
- Accurate, reliable data logging — stores up to 60 days of 1-minute resolution data in non-volatile memory.
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Built-in relay — dry-contact relay for external contactor control (ideal for load switching/automation).
- Secure integrations — supports MQTT, HTTP and WebSocket with TLS for inbound connections.
Key features
- 4-Quadrant measurement (active & apparent power)
- Instantaneous readings: voltage, current, active & apparent power per channel
- Data storage: 60 days of 1-minute interval logs (non-volatile)
- Real-time clock to preserve timestamps during SNTP interruptions
- Optical pulse indicator for energy flow feedback
- Accuracy Class B (IEC 62053-21)
- Photovoltaic (PV) ready — supports bi-directional power monitoring
- Embedded web UI for setup, monitoring and configuration
Applications
Designed for a broad range of installations:
- Residential metering and solar monitoring
- MDUs — apartments, hotels and multi-dwelling complexes
- Light commercial — small offices, retail and hospitality
- Agricultural and municipal energy monitoring
- Building energy management and integrator projects
Connectivity & integration
Use the integrated web interface for local access or connect the device to automation systems via:
- MQTT (secure with TLS)
- HTTP / WebSocket (secure with TLS)
- Local LAN operation and cloud operation (optional)
Safety & supported load types
Built-in protections and broad load compatibility:
- Overheating protection
- Supports resistive, capacitive and inductive loads (e.g., heaters, LED drivers, motors)
User interface
- Tactile dome button — toggle built-in relay, device AP, and factory reset actions
- Multi-state LEDs — power, Wi-Fi/LAN status, output relay, counting indicator and OTA update status
Selected technical specifications
| Mounting | DIN-rail |
|---|---|
| Dimensions | 94 × 19 × 69 mm |
| Weight | ≈ 63 g |
| Supply voltage | AC 100–260 V, 50/60 Hz |
| Power consumption | < 3 W |
| Current measurement (via CT) | 0–50 A (accuracy ±1% at 5–50 A) |
| Voltage measurement | 100–260 V (accuracy ±1%) |
| Relay rating | Max switching current 2 A; max switching voltage AC 240 V |
| Data logging | ≥ 60 days @ 1-minute resolution; CSV / JSON export |
| Comms | Wi-Fi 802.11 b/g/n, Ethernet (RJ45), Bluetooth 4.2 |
| MCU / Flash | ESP32-based / 16 MB flash |
| Environmental | Operating: -20 °C to 40 °C; 30–70% RH |
What’s included
- Shelly Pro EM-50 device
- DIN-rail mounting instructions
- Quick start guide & safety notes
Installation & support
For safety and compliance, installation should be performed by a qualified electrician or certified installer. The Shelly Pro EM-50 is intended for professional use in distribution panels and control enclosures. For technical documentation, firmware updates and integration notes, consult the official Shelly resources or your distributor.
Ready to add professional, secure metering to your panel? — Add the Shelly Pro EM-50 to your cart or contact our technical sales team for bulk / project pricing and integration support.
