Shelly PRO 3EM 63A
The Shelly Pro 3EM 3CT63 is a professional DIN rail mounted energy meter for single-phase or three-phase installations, supplied with a 63A three-phase current transformer set for non-contact power measurement. Designed for switchboards, commercial sites and advanced smart home projects, it gives installers and facility managers accurate real-time visibility of energy consumption, phase load, solar production and power usage trends.
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5 Year Warranty
Description
The Shelly Pro 3EM 3CT63 is a compact, DIN rail mounted energy monitoring solution designed for professional electrical installations. Supplied with a 63A three-phase current transformer set, it allows electricians and integrators to monitor single-phase or three-phase circuits without direct current path measurement, making it suitable for switchboards, sub-boards, light commercial sites, retail premises, workshops and advanced residential energy monitoring projects.
With four-quadrant measurement, the Shelly Pro 3EM 3CT63 can measure both imported and exported energy, making it a strong choice for solar monitoring, load balancing, energy optimisation and cost allocation. It can be used to monitor whole-site consumption, individual circuits, HVAC systems, refrigeration, EV chargers, solar production, or other high-value loads where detailed energy visibility is required.
For trade customers, the Pro 3EM 3CT63 offers a professional installation format with DIN rail mounting, wired power, local network connectivity and integration flexibility. It is ideal for installers building energy dashboards, Home Assistant systems, commercial monitoring projects, or automation rules based on real-time power usage. For example, it can help identify peak load periods, monitor phase imbalance, trigger automations when solar export is high, or provide clients with better insight into where energy is being used.
The device does not include a built-in relay, so it is designed primarily for monitoring rather than direct load switching. Contactor control can be added using a compatible Shelly Pro Addon where required.
Key Features
- Professional DIN rail form factor for switchboard installation
- Suitable for single-phase and three-phase energy monitoring
- Includes 63A three-phase current transformer set
- Non-contact current measurement via CT clamps
- Four-quadrant measurement for import/export energy monitoring
- Useful for solar, EV charging, HVAC, refrigeration and whole-site monitoring
- Ideal for Home Assistant, commercial dashboards and energy optimisation projects
- Helps installers deliver clearer energy visibility and smarter automation outcomes for clients
Specifications
| Physical | |
| Size (HxWxD): | Shelly Pro 3EM-3CT63: 94x19x69 mmShelly 3CT63: 14x54x26 mm |
| Weight: | Shelly Pro 3EM-3CT63: 62 gShelly 3CT63: 32 g |
| Mounting: | Shelly Pro 3EM-3CT63: DIN railShelly 3CT63: Freestanding on phase wires |
| Conductor aperture: | Shelly 3CT63: Ø9 mm / Ø0.35 in |
| Shell material: | Plastic |
| Shell colour: | White |
| Screw terminals max torque: | 0.4 Nm / 3.5 lbin |
| Conductor cross section: | Shelly Pro 3EM-3CT63: 0.5 to 2.5 mm² / 20 to 14 AWGShelly 3CT63: 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, and bootlace ferrules) |
| Conductor stripped length: | 6 to 7 mm / 0.24 to 0.28 in |
| Environmental | |
| Ambient working 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: | 100 - 260 V~, 50/60 Hz |
| Power supply DC: | No |
| Device power consumption: | < 3 W |
| External protection: | Tripping characteristic B or C, 16A max. rated current, min. 6 kA interrupting rating, energy limiting class 3 |
| Monitoring clamps: | Includes Shelly 3CT63 63A three-phase current transformer |
| Shelly 3CT63 electrical strength: | 1000 V~, 60 sec |
| Sensors & Meters | |
| Internal temperature sensor: | Yes |
| Voltmeters (RMS for each phase): | 100 - 260 V |
| Voltmeters accuracy: | ±1 % |
| Ammeters (RMS via CT): | 0 - 63 A |
| Ammeters accuracy: | ±1 % (2 - 63 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A) |
| Compatible current transformers: | Shelly 3CT63 |
| Power and energy meters: | Active and apparent power; Active and apparent energy; Power factor; Fundamental active and fundamental reactive energy |
| Measurement data storage: | Up to 60 days of 1 min data resolution |
| Data export: | CSV for recorded values, JSON format export through RPC |
| Radio & Data | |
| Wi-Fi protocol: | 802.11 b/g/n |
| Wi-Fi Band: | 2401 - 2495 MHz |
| Wi-Fi signal power: | <20 dBm |
| Wireless range: | Up to 50 m outdoors and up to 30 m indoors (depending on the building materials) |
| Bluetooth Protocol: | 4.2 |
| Bluetooth Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| Ethernet: | 1 x RJ45 Ethernet socket |
| Supported protocols: | Modbus, MQTT, RPC |
| MCU | |
| CPU: | ESP32-D0WDQ6 |
| Flash memory: | 16 MB |
| Firmware Capabilities | |
| Webhooks (URL actions): | 20 with 5 URLs per hook |
| Scripting: | mJS |
| MQTT: | Yes |
| Modbus: | Yes |
| CoAP: | No |
