5A Range Of AC Current Sensor

The 5A AC Current Sensor Module is a high-precision single-phase AC current measurement device designed to provide reliable and safe current sensing for embedded electronics, energy monitoring, and industrial control applications. It is built around a precision miniature current transformer with a 1000:1 turns ratio, which converts large AC primary currents into small, manageable secondary currents that are easy to measure with a microcontroller.

A major advantage of using a transformer-based current sensor is the galvanic isolation it provides between the high-voltage AC line and the low-voltage measurement circuit. This isolation is critical for operator safety and microcontroller protection, making the module suitable for mains-voltage applications without risk to the user or the connected electronics.

The module includes an onboard sampling resistor that converts the transformer's output current into a proportional voltage signal that can be read directly by any microcontroller's ADC (Analog-to-Digital Converter). The relationship between input and output is 5A primary current → 5mA secondary current, meaning the module is precisely calibrated and linear within its rated range. The signal can be further amplified or conditioned externally to match the input range of your specific microcontroller.

With a rated accuracy of 0.2 class, an outstanding linearity of 0.002, and a useful linear range of 0–10A (with a 100-ohm burden resistor), this module is suitable for applications that demand both reliability and precision. The robust epoxy resin encapsulation provides excellent insulation, environmental protection, and mechanical strength, while the wide operating temperature range of -40°C to +90°C allows use in industrial and harsh environments.

The compact form factor — just 18 × 19 × 22 mm and weighing only 8 grams — makes the module easy to integrate into small enclosures, control panels, IoT devices, and energy monitoring systems. With proper software calibration (using libraries such as EmonLib for Arduino), you can calculate true RMS current, real power, apparent power, power factor, and energy consumption (kWh).

Whether you are building a smart electricity meter, an industrial motor protection system, a home energy dashboard, a solar inverter monitor, or an IoT power consumption tracker, this 5A AC current sensor module provides the accuracy, isolation, and safety required for professional-grade results.

Specifications

Electrical

• Sensor Type: Precision AC Current Transformer (CT) Module
• Rated Input Current: 5A AC
• Rated Output Current: 5 mA
• Turns Ratio: 1000 : 1
• Linear Range: 0 – 10A (with 100 Ω burden resistor)
• Linearity: 0.002
• Precision Rating: Class 0.2

Construction

• Sampling Resistor: Onboard
• Sealing Material: Epoxy Resin encapsulation
• Isolation: Galvanic isolation between primary (AC line) and secondary (measurement) sides

Environmental

• Operating Temperature: -40°C to +90°C

Mechanical

• Length: 18 mm
• Width: 19 mm
• Height: 22 mm
• Weight: 8 g

Compatibility

• Arduino UNO, Nano, Mega
• ESP32, ESP8266
• STM32, PIC
• Raspberry Pi (with external ADC)
• Any microcontroller with analog input

Applications

• Home energy monitoring systems measuring real-time appliance power
• Smart electricity meters with IoT cloud reporting
• AC load current measurement for appliances, lighting, fans, and heaters
• Motor current monitoring and protection for pumps, compressors, and tools
• Overcurrent protection and fault detection in custom power systems
• Power factor and energy calculation projects using Arduino and ESP32
• Industrial control systems monitoring machinery operation
• Solar inverter monitoring for AC output current measurement
• Smart home automation triggering events on appliance state changes
• HVAC monitoring for compressors, fans, and heating elements
• Educational STEM projects demonstrating AC current and power concepts
• Renewable energy systems monitoring grid-tie inverters and AC loads
• Data center and server room power monitoring
• Custom UPS and backup power systems for current tracking
• Building management systems (BMS) for commercial energy tracking
• Anti-theft electricity monitoring detecting unusual current draw
• Conveyor belt and industrial automation load monitoring
• Electric vehicle (EV) charger monitoring
• Pump and water system protection in agriculture and irrigation
• Workshop and machine shop equipment monitoring