Sonoff Smart Power Meter POW CT Ring

Product Introduction

The Sonoff POW Ring Smart Power Meter (POWCT) is a powerful WiFi-enabled energy monitoring device designed to track electricity usage safely and accurately using a split-core CT clamp sensor. This innovative design allows current measurement without direct contact with live wires, making installation safer and more convenient.

With the ability to monitor electrical loads up to 100A, the POW CT Ring is ideal for measuring energy consumption of entire circuits, large appliances, solar systems, or EV chargers. Through the eWeLink, users can view real-time power data, historical energy usage, and automation controls directly from their smartphone.

Designed for modern energy-aware homes, the POW CT Ring provides intelligent monitoring, improved energy management, and deeper insight into household electricity consumption.

Key Features

Non-Intrusive CT Clamp Measurement

The split-core current transformer clamp measures electricity usage without cutting or modifying existing wiring, improving safety and installation convenience.

High-Capacity Energy Monitoring

Supports measurement of electrical loads up to 100A, making it suitable for monitoring entire circuits, heavy appliances, or main power lines.

Real-Time Power Monitoring

Track voltage, current, power usage, and total energy consumption in real time through the mobile app.

Energy Consumption History

Access detailed historical electricity usage data to identify consumption patterns and optimize energy efficiency.

Integrated Relay Control

Includes a small relay output that can trigger a contactor to control high-power devices automatically.

External WiFi Antenna

An external SMA antenna improves signal strength and connectivity range for reliable monitoring.

Automation & Smart Scenes

Integrate energy monitoring into smart home automation scenes and energy management routines.

Smart Home Integration

The POW CT Ring integrates with the eWeLink smart home ecosystem, providing centralized monitoring and automation for connected devices.

It supports voice assistant compatibility with:

• Amazon Alexa
• Google Assistant

Through automation scenes, the device can be used to trigger actions based on power usage thresholds, such as switching devices off when consumption exceeds a defined limit.

Technical Specifications

Product Type: Smart Power Meter with CT Clamp
Model: POWCT (POW Ring)
Connectivity: WiFi 2.4 GHz (IEEE 802.11 b/g/n)
Power Input: 100–240V AC, 50/60Hz
Current Measurement Range: 0–100A
Sensor Type: Split-core current transformer (CT clamp)
Relay Output: Up to 2A for triggering external contactors
Wireless Chip: ESP32 microcontroller
Antenna: External SMA WiFi antenna
Operating Temperature: −40°C to 50°C
Material: Flame-retardant PC housing
Dimensions: 98 × 54 × 31 mm

What’s in the Box

Sonoff POW Ring Smart Power Meter (POWCT)
Split-core CT clamp sensor
External WiFi antenna
DIN rail mounting adapter
User manual / quick start guide