Shelly 3EM-63T Gen3

Device identification

Name: Shelly 3EM-63W Gen3 (Wire model) / Shelly 3EM-63T Gen3 (Flat terminal model)

Model: S3EM-003CXCEU63

Device SSID: Shelly3EM63G3-XXXXXXXXXXXX

BLE Model ID: 0x1026

Short description

Shelly 3EM-63 Gen3 is a compact energy meter for monitoring a three-phase system or three independent
single-phase circuits. Works standalone on Wi-Fi or via cloud automation (MQTT, HTTP, WebSocket with TLS).
Reports real-time energy, voltage, current, and power per phase. Stores 7 days of 1-minute interval data
in non-volatile memory. Built-in RTC ensures correct timestamps even if SNTP is unavailable.
Can be accessed and managed locally or remotely through web interface and home automation platforms.

Main features

• 4-quadrant measurement
• On-MCB mounting: above¹ or below the breaker
• Supports three-phase or single-phase installations
• Non-contact measurement via current transformers
• Phase sequence error detection² (optional)
• No load threshold³
• Optical pulse indication of energy usage
• Real-time clock keeps timestamps offline⁴
• Data logs: up to 7 days stored
• Accuracy Class B (IEC 62053-21)
• Photovoltaic ready

¹ Shelly 3EM-63T Gen3 only.

² Phase sequence error detection monitors phase zero-crossings; detects A-B-C vs A-C-B sequence.

³ Loads <30 VA per channel: power shown but no energy accumulated.

⁴ Built-in RTC provides timestamps during network interruptions.

Use cases

• Power monitoring: Real-time consumption tracking
• Energy efficiency: Optimize usage patterns
• Appliance health: Detect unusual consumption spikes
• Cost management: Estimate and reduce electricity bills
• Space-efficient install: Mount above/under DIN breaker
• Remote monitoring: Publish to cloud systems, monitor anywhere
• Local monitoring: Access stored records from web interface; enable local automation

Device electrical interfaces

Inputs: 3 live inputs (LA, LB, LC), plus neutral (N)

3EM-63T Gen3: Flat terminals

3EM-63W Gen3: Color-coded wires

Connectivity

Wi-Fi

Bluetooth

Safety function

Internal temperature sensing and reporting

Supported load types

• Resistive (bulbs, heaters)
• Capacitive (capacitor banks, electronics, motor capacitors)
• Inductive (drivers, fans, refrigerators, ACs, etc.)

User interface

Inputs: One tactile dome button

• Hold 5s → enable AP

• Hold 10s → factory reset

Outputs: LED indication

• AP mode → Blue

• STA mode, not connected → Red

• STA mode, connected (cloud disabled) → Yellow

• STA mode, connected (cloud enabled) → Green

• OTA update → Flashing Red/Blue

• Energy counting → Red flashing, f

Physical

Size (HxWxD): 21×54×42 mm / 0.83×2.13×1.65 in (Shelly 3EM-63W Gen3, without wires); 31×54×42 mm / 1.22×2.13×1.65 in (Shelly 3EM-63T Gen3, without wires)

Wires length: 260 mm (including flat terminal)

Weight: 58 g / 2.05 oz (Shelly 3EM-63W Gen3, including wires); 52 g / 1.83 oz (Shelly 3EM-63T Gen3, including wire)

Conductor aperture: Ø8 mm / Ø0.3 in

Mounting: Above or under DIN-rail mounted circuit breakers

Shell material: Plastic

Color: White

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% RH

Max altitude: 2000 m (6562 ft)

Electrical

Power supply: 220–240 V~ 50/60 Hz (between LA and N)

Power consumption: < 2 W

External protection: 63 A, tripping characteristic B or C; 6 kA interrupting rating; energy limiting class 3

Sensors & Meters

Internal temperature sensor: Yes

Voltmeters (RMS per phase): 220–240 V~ 50/60 Hz

Voltmeters accuracy: Better than ±1%

Ammeters (RMS via integrated CT per phase): 0–63 A (130 A saturation)

Ammeters accuracy: ±1% (2–63 A), ±2% (1–2 A), ±5% (0–1 A)

Power & energy meters: Active and apparent power; active and apparent energy; power factor; fundamental active and fundamental reactive energy

No load threshold: 30 VA

Measurement data storage: At least 7 days at 1 min resolution

Data export: CSV for PQ recorded values; JSON export via RPC

Radio

Wi-Fi protocol: 802.11 b/g/n

Wi-Fi RF band: 2401–2483 MHz

Wi-Fi max RF power: < 20 dBm

Wi-Fi range: Up to 30 m / 100 ft indoors; 50 m / 160 ft outdoors (depends on conditions)

Bluetooth protocol: 4.2

Bluetooth RF band: 2400–2483.5 MHz

Bluetooth max RF power: < 4 dBm

Bluetooth range: Up to 10 m / 33 ft indoors; 30 m / 100 ft outdoors (depends on conditions)

MCU

CPU: ESP-Shelly-C38F

Flash: 8 MB

Firmware capabilities

Schedules: 20

Webhooks: 20 (up to 5 URLs each)

Scripting: Yes

MQTT: Yes