PZEM-004T AC Voltage Current Power Factor Power Communication Module Module TTL Serial Communication

PZEM-004T AC Energy Meter Module 

The PZEM-004T is a high-precision single-phase AC energy monitoring module designed for 
real-time measurement of electrical parameters. It is widely used in embedded systems and IoT based energy monitoring applications. 

The module measures voltage, current, active power, energy consumption, power factor, and 
frequency, and communicates via TTL-based Modbus-RTU protocol, making it suitable for 
integration with microcontrollers such as ESP32. 

Key Features 
 Single-phase AC measurement 
 Measures: 
o Voltage (V) 
o Current (A) 
o Active Power (W) 
o Energy (kWh) 
o Power Factor (PF) 
o Frequency (Hz) 
 TTL Modbus-RTU communication 
 High measurement accuracy (typically ±0.5%) 
 100A current measurement using external Current Transformer (CT) 
 Electrical isolation between high-voltage and low-voltage sections 
 Compact PCB module design 
 Suitable for embedded and IoT applications

 Technical Specifications 

 
Rated Voltage: 80 – 260VAC 
Rated Current: Up to 100A (with CT) 
Frequency Range: 45 – 65 Hz 
Voltage Accuracy: ±0.5% 
Current Accuracy: ±0.5% 
Communication: TTL UART (Modbus-RTU) 
Default Baud Rate: 9600 bps 
Operating Temperature: -10°C to 60°C 
Isolation : Optocoupler isolation.