Remote ON/OFF Load Control & CT-Based Power
WattNet-3R is a smart relay with energy monitoring designed to control one electrical load remotely while measuring its actual power and energy consumption using CT-based current sensing.
It combines reliable relay switching with real electrical measurement, making it suitable when device-level control and accurate energy visibility are both required—without moving into whole-home or multi-circuit metering.
Why WattNet-3R
Is This the Right Smart Relay for Your Load?
WattNet-3R is designed for setups where a single electrical load needs both remote control and accurate energy monitoring.
What Makes This a Smart Relay with Energy Monitoring?
A smart relay is primarily designed to control a load—turning a circuit ON or OFF remotely.
- Relay switching for reliable ON/OFF control
- CT-based energy monitoring that measures real current and calculates actual power and energy usage
This is what differentiates it from basic relays or smart plugs. With CT sensing, WattNet-3R provides real measurement, not software-based estimation.
- energy monitoring relay
- smart relay energy monitor
- relay with energy monitoring
- CT-based energy monitoring relay
All describe the same core idea: device-level control with accurate energy visibility.
WHAT WE STAND FOR
Typical Applications
WattNet-3R is a smart relay for individual loads, especially where both control and energy insight matter.
Common applications include:
HVAC equipment
remote shutoff or scheduling with real energy tracking
Pumps
monitor consumption and identify abnormal draw patterns
Motors and dedicated machinery
device-level power visibility
Single dedicated circuits
when one load’s energy use needs to be measured accurately
This makes it a practical smart relay for HVAC, pumps, and equipment in residential and commercial environments.
Single-Phase & Three-Phase Support
WattNet-3R supports:
Because measurement is CT-based, energy monitoring is tied to actual current sensing, making it suitable across different system types without estimation.
Smart Relay vs Smart Power Meter
A smart relay and a smart power meter serve different purposes:
- A smart power meter focuses on measuring energy, often at panel or service level
- A smart relay focuses on controlling a specific load
WattNet-3R sits between these categories as a smart relay with energy monitoring—designed for individual loads, where control and accurate energy data are both required.
If you don’t need panel-wide visibility and only care about one piece of equipment, this approach is simpler and more direct.
WattNet-3R vs Other Grus Devices
Each device in the Grus lineup is designed for a distinct role:
WattNet-3R
Smart relay with energy monitoring for one load
WattPanel series
Panel-level and multi-circuit energy monitoring
WattNet-1
Energy monitoring only (no relay control)
If your goal is device-level control plus measurement, WattNet-3R is the correct choice.
Key Features
FAQs
Do I need one WattNet-3R per load?
Yes. Each WattNet-3R is designed to control and monitor one electrical load.
Multiple independent loads require multiple units.
Does WattNet-3R measure real energy or estimated values?
It measures real current using CTs. Power and energy data are calculated from actual measurements, not estimates.
Can WattNet-3R replace a whole-home energy meter?
No. It is designed for load-level monitoring and control, not whole-home or multi-circuit metering.
Is this a plug-and-play device?
No. WattNet-3R is intended for hard-wired installations and requires appropriate electrical knowledge or professional assistance.
Product Technical Specifications
Additional information
| Weight | 1 lbs |
|---|---|
| Dimensions | 9 × 3.5 × 6.5 cm |
| Wi-Fi | 802.11 B/G/N20/N40 |
| BLE | • Bluetooth 5.2 Low Energy |
| RF Characteristics | Operating frequency: 2.4GHz |
| Operating Voltage | 90~380 Vac 50/60 Hz |
| Supported Systems | Single-phase & Three-phase electrical systems |
| Calibrated Metering Accuracy | ≤ 100W ( Within ±2W ) |
| Max. Load Current | 16A Dry contact |
| Operating environment | Temperature: -20 ℃~ +55 ℃ |
| Current Capacitance | 80A*3, 120A*3, 200A*3, 300A*3, 500A*3, 750A*3 |
| Features | Bi-Directional Energy Measurement, Overload Protection & Auto Cut-Off, Real-Time Energy & Usage Tracking, Single & three-phase support, Smart relay control, Wi-Fi app control |
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