Pzem-004T AC 80~260V 100A Mini Multifuncion Power Energy Amp Voltage Monitor Meter Communication Module with CT Coil
Pzem-004T AC 80~260V 100A Mini Multifuncion Power Energy Amp Voltage Monitor Meter Communication Module with CT Coil
Pzem-004T AC 80~260V 100A Mini Multifuncion Power Energy Amp Voltage Monitor Meter Communication Module with CT Coil
The Pzem-004T is a compact, multi-function AC power energy monitoring module designed to measure voltage, current, power consumption, and energy usage in real-time across industrial and residential applications. Electrical engineers, industrial automation technicians, and IoT developers use this module to monitor power distribution systems, optimize energy consumption, and detect electrical faults with precision. This device solves the critical problem of accurate power measurement and remote monitoring by integrating a current transformer coil with digital communication capabilities, enabling seamless integration into SCADA systems and smart metering applications.
Product Overview
The Pzem-004T operates on the principle of non-invasive current measurement using a split-core current transformer coil that clamps around the live conductor without requiring circuit interruption. The module measures RMS voltage and current values and performs real-time calculations to derive active power, reactive power, apparent power, power factor, and cumulative energy consumption. The integrated microcontroller processes these analog signals with high-resolution ADC conversion, delivering measurement accuracy within 1 percent across the entire operating range. Communication occurs via RS-485 Modbus protocol, allowing multiple modules to be networked on a single twisted-pair cable for centralized monitoring of complex electrical systems.
What distinguishes the Pzem-004T is its combination of affordability, accuracy, and communication flexibility in a DIN-rail mountable form factor. The CT coil design eliminates the need for invasive current sensing, reducing installation time and safety risks. The module operates across wide voltage ranges from 80V to 260V AC, making it suitable for both single-phase residential circuits and industrial distribution systems. Its ability to store energy data and transmit readings via Modbus makes it ideal for building management systems, renewable energy monitoring, industrial process control, and educational laboratories requiring reliable power analysis instrumentation.
Key Specifications
| Specification | Details |
| Product Type | AC Power Energy Monitor with Communication Module |
| Brand | Pzem |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Voltage Range | AC 80V to 260V |
| Current Measurement | 0 to 100A via CT coil |
| Measurement Accuracy | 1 percent for voltage and current |
| Communication Protocol | RS-485 Modbus RTU |
| Measured Parameters | Voltage, Current, Active Power, Reactive Power, Apparent Power, Power Factor, Energy Consumption |
| CT Coil Ratio | 100A/5A split-core current transformer |
Key Features
- Non-invasive current measurement using split-core CT coil eliminates circuit interruption and reduces installation complexity in live systems
- Multi-parameter monitoring including voltage, current, active power, reactive power, apparent power, power factor, and cumulative energy with real-time calculation
- RS-485 Modbus RTU communication interface enables daisy-chain networking of multiple modules for centralized data acquisition and remote monitoring
- Wide AC voltage range from 80V to 260V supports both single-phase residential and industrial three-phase distribution systems
- High measurement accuracy of 1 percent ensures reliable power analysis for energy audits, fault detection, and load profiling applications
- Compact DIN-rail mountable design fits standard 35mm rail installations for space-constrained control cabinets and electrical panels
Applications and Use Cases
- Smart building energy management systems where real-time monitoring of individual circuit loads enables demand-side management and peak load reduction strategies
- Industrial process monitoring and control systems requiring power factor correction analysis and harmonic distortion detection for motor-driven equipment
- Renewable energy installations including solar PV and wind systems where energy monitoring modules track generation efficiency and grid injection parameters
- Educational laboratories and technical training centers using the module for power systems analysis, electrical measurements, and IoT integration projects
- Electrical fault diagnosis and predictive maintenance programs that analyze power consumption patterns to identify equipment degradation and anomalies
- Data center infrastructure management where monitoring of UPS systems, server rack power distribution, and cooling system efficiency requires distributed sensing
How to Use
Installation begins by mounting the Pzem-004T module on a 35mm DIN rail within your electrical panel or control cabinet. Connect the AC voltage input terminals to the phase and neutral conductors of the circuit you wish to monitor, ensuring proper polarity. Slide the split-core CT coil around the live conductor carrying the load current, ensuring the coil closes completely and the secondary winding terminals connect to the module's current input terminals. The CT coil must encircle only the phase conductor and not the neutral wire to ensure accurate current measurement.
For communication setup, connect the RS-485 A and B terminals to a Modbus master device such as a PLC, industrial gateway, or computer with RS-485 adapter using twisted-pair shielded cable. Configure the module's Modbus slave address using the onboard DIP switches or software utility, typically setting it to a unique address between 1 and 247. Power the module from a 5V DC supply derived from a regulated power adapter or the control system's auxiliary power. Once powered, the module begins measuring and storing energy data internally. Query the module using Modbus function codes 3 and 4 to read holding and input registers containing voltage, current, power, and energy values. Most applications use polling intervals of 1 to 10 seconds depending on the monitoring application's responsiveness requirements.
Frequently Asked Questions
What is the difference between active power, reactive power, and apparent power measured by the Pzem-004T?
Active power measured in watts represents the real power consumed by resistive loads and performing useful work. Reactive power measured in VAR represents the power stored and released by inductive and capacitive elements in the circuit. Apparent power measured in VA is the vector sum of active and reactive power. The power factor displayed is the ratio of active to apparent power, indicating how efficiently the load converts electrical power into useful work. A power factor of 1.0 indicates purely resistive load, while lower values indicate reactive loads requiring power factor correction.
Can the Pzem-004T measure three-phase power systems?
The Pzem-004T is designed for single-phase AC circuits. For three-phase systems, you must install three separate modules, one on each phase conductor, with individual CT coils. Each module measures its respective phase voltage and current independently. You can network all three modules on the same RS-485 bus with different Modbus addresses, allowing a central controller to aggregate total three-phase power consumption by summing the individual phase readings.
What is the maximum cable length for RS-485 communication from the Pzem-004T?
RS-485 communication supports cable lengths up to 1200 meters at 9600 baud rate with proper twisted-pair shielded cable and termination resistors. For distances exceeding 500 meters, install 120-ohm termination resistors at both ends of the RS-485 bus to minimize signal reflections and ensure reliable data transmission. Use twisted-pair cable with 0.5 to 0.8 millimeter conductor diameter and maintain consistent impedance throughout the installation.
How do I reset the accumulated energy reading on the Pzem-004T?
Energy accumulation is stored in the module's non-volatile memory and persists across power cycles. To reset the energy counter, use the Modbus write function code 16 to write a zero value to the energy register address. Most monitoring software and PLC programming interfaces provide a simple button or command to execute this reset operation. Consult the Modbus register map documentation for your specific firmware version to identify the correct register address for energy reset.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Returns: 7-day return policy on manufacturing defects only
Buy Pzem-004T AC 80~260V 100A Mini Multifuncion Power Energy Amp Voltage Monitor Meter Communication Module with CT Coil Online in India
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