Shelly Pro 3EM (120A) 3-Phase Smart Energy Meter - Precise Monitoring

In this review the Shelly Pro 3EM (120A) is presented as a solution for homeowners, installers and small businesses that need precise three-phase energy monitoring without a central hub. The unit's single biggest advantage is its combination of accurate 1% active energy measurement across three phases with native Wi-Fi and LAN connectivity, making it straightforward to track consumption, generation from solar panels and two-way energy flow. For anyone wanting DIN-rail mounting and cloud or local access, this device simplifies data gathering and automation.

Key Features

• Three-phase metering: Measures each phase independently so users can spot imbalances and isolate high-usage circuits for cost control.
• High accuracy: 1% active energy accuracy delivers reliable readings for billing, efficiency checks and operational decisions.
• Two-way consumption: Calculates produced and used energy on each phase, useful for solar panels monitoring and energy-export situations.
• Connectivity options: Built-in Wi-Fi and LAN let you use cloud services or local networks for real-time data and automation integration.
• Bluetooth gateway: Expands local device connectivity for smart home setups and reduces the need for extra gateways.
• DIN-rail form factor: Compact, industrial-grade mounting fits electrical panels in homes, offices or light industrial settings.

Who It's For

The Shelly Pro 3EM is aimed at electricians, savvy homeowners with solar arrays and small business operators who need per-phase energy visibility and reliable two-way measurement. It is especially relevant when remote monitoring, cloud access or integration with Shelly Smart Control app and voice assistants is desired.

Those who should look elsewhere include users who require integrated PV inverters with built-in metering or facilities needing ultra-high current CTs beyond the supplied 120A transformers; for very large industrial systems a different class of meter would be more appropriate.

Pros & Cons

Pros

• Accurate 1% active energy readings across three phases for dependable monitoring.
• Flexible connectivity with Wi-Fi, LAN and Bluetooth gateway functions for local or cloud control.
• Two-way consumption reporting makes it practical for solar generation and export tracking.
• DIN-rail mounting and included 120A CTs simplify panel installation.

Cons

• Supplied CTs are 120A, so installations with higher current requirements will need alternate transformers.
• Advanced integration may require familiarity with network configuration or cloud setup for optimal use.

Specifications

Product	Shelly Pro 3EM (120A)
Phases	3-phase
Current Transformers	Three 120A CTs included
Connectivity	Wi-Fi, LAN and Bluetooth gateway
Accuracy	1% active energy measurement
Mounting	DIN-rail
Monitoring	Two-way consumption (produced and used)

Our Verdict

The Shelly Pro 3EM (120A) is a strong choice for residential and light commercial three-phase monitoring because it pairs industrial-style DIN-rail mounting and accurate 1% measurement with versatile connectivity and solar-ready two-way reporting. It represents good value when you need reliable per-phase data and easy integration into smart home or cloud setups, provided your currents stay within the 120A CT limit.

Frequently Asked Questions

Can this meter monitor solar generation?
Yes. It supports two-way consumption so it can report produced and used energy for each phase, making it suitable for solar panel monitoring.

Does it need a hub to work with voice assistants?
No. The device has native Wi-Fi and works with the Shelly app and compatible voice assistants without a separate hub.

Are the included CTs sufficient for all installations?
The package includes three 120A CTs which cover most residential and small commercial installs; larger installations may require CTs with higher current ratings.