The Shelly Pro 3EM energy cost meter AC 120 A 50-60 Hz is compared against two alternative energy monitoring devices from the same brand: Shelly Pro 3EM 3-phase Wi‑Fi and Shelly EM. All three devices are designed to measure and monitor electrical consumption in AC systems operating at 50 to 60 Hz. The main differences lie in their maximum current support (120 A for the Pro 3EM models versus 2 A for the Shelly EM), phase configuration, and primary purpose: professional three-phase meters in the Pro series are built for comprehensive load monitoring in residential and commercial installations, whereas the compact Shelly EM is tailored for localized control and managing specific devices.
⚙️ The table below compares the key characteristics of the three devices, including power type, supported current, monitoring capabilities, and practical use cases in real-world environments.
| Comparison parameter | Shelly Pro 3EM energy cost meter AC 120 A 50-60 Hz | Shelly Pro 3EM 3-phase Wi‑Fi | Shelly EM | Practical significance of differences |
|---|
| Device type | Three-phase energy meter | Three-phase energy meter with Wi-Fi | Single-phase energy meter with contactor control | Determines the scale and placement suitability within the electrical panel. |
| Maximum current | 120 A | 120 A | 2 A | Pro 3EM models fit main grid entries, while Shelly EM requires external current transformers for heavier loads. |
| Network frequency | 50–60 Hz | 50–60 Hz | 50–60 Hz | Standard frequency for operating in residential and commercial electrical grids in most regions. |
| Purpose and functions | Tracking energy costs | Three-phase voltage monitoring, remote access, alerts, and automation | Precise energy monitoring and load control | The Pro 3EM offers advanced automation and control features suited for larger installations. |
◎ The suitability table below helps determine which product best aligns with specific automation needs and energy monitoring scenarios.
| Use case | Recommended product | Why |
|---|
| Monitoring total home or office energy consumption across 3 phases | Shelly Pro 3EM energy cost meter AC 120 A 50-60 Hz | Provides current measurement up to 120 A on three-phase networks and helps track energy expenses effectively. |
| Smart home integration with remote access and historical usage data | Energy meter Shelly Pro 3EM 3-phase Wi‑Fi | Delivers advanced wireless monitoring, real-time data, and smooth automation system integration. |
| Localized monitoring and control of specific lines or appliances | WiFi Energy Meter and Contactor Control Shelly EM | Features ultra-compact dimensions and contactor control capabilities for targeted management. |
The Shelly Pro 3EM energy cost meter AC 120 A 50-60 Hz is ideal for comprehensive three-phase energy monitoring with loads up to 120 A. Compared to the compact Shelly EM, it handles significantly heavier grid loads, while sharing the robust metering capabilities of the Shelly Pro 3EM 3-phase Wi‑Fi with a strong focus on cost tracking. Choose this product if you need a reliable three-phase meter dedicated to keeping track of overall energy expenses.
