The True RMS current sensor measures AC/DC currents from 1mA to 5A, with output options of 0-20mA or 4-20mA. It offers 0.5 accuracy, a 6V load capacity, and a fast response time. Operating on DC +12V or +24V, it’s ideal for monitoring current in industrial, power, renewable energy, electric vehicle, HVAC, and automation systems.
Specification
Model |
ATO-WBI127S01 |
Input |
Input Current |
AC/DC 1mA, 5mA, 20mA, 50mA, 200mA, 500mA, 1A, 2A, 5A (expandable with external shunt resistor) (optional) |
Allowable Overload |
10 times the rated input current value, sustained for 1 second, with a 300-second interval, repeatable 5 times |
Linear Measurement Range |
0%~120% of rated input |
Frequency Range |
±DC/20Hz ~ 10kHz |
Input Impedance |
Ri = 50mV/kx (where x represents the measured current) |
Output |
Output Type |
True RMS voltage output |
Output Specifications |
DC 0~20mA; 4~20mA (optional) |
Accuracy Class |
0.5 |
Load Capacity |
6V |
Response Time |
< 250ms |
Temperature Drift |
300 x 10⁻⁶/°C |
Other parameters |
Auxiliary Power |
DC +12V,+24V |
Static Current |
≤37mA |
Isolation Characteristics |
Inputs and outputs isolated, outputs powered |
Isolation Withstand Voltage |
DC 1.5kV,1min
|
Operating Temperature |
0℃~50℃ |
Storage Temperature |
-25℃~+70℃ |
Enclosure Protection Rating |
IP20 |
Mean Time Between Failures (MTBF) |
>50000h |
Enclosure Material (Acc. to UL94V-0) |
Flame retardant ABS |
Mounting |
Snap-on construction for NS35/7.5, NS35/15 or European standard EN50022 rails or with M3 screws. |
Weight |
<90g |
Note: Other parameters contact customer service.
Feature
- Photonic Isolation Principle: Utilizes optical isolation to provide high-precision current measurements for both AC and DC inputs, ensuring safety and signal integrity.
- High Accuracy & Wide Frequency Response: Provides precise current measurements across a wide frequency range, ensuring reliable data in applications with both sinusoidal and non-sinusoidal currents.
- Low Drift and Low Power Consumption: Designed for minimal temperature drift (300 x 10⁻⁶/°C) and low power usage, making it highly efficient for long-term, continuous monitoring.
- Wide Temperature Range: Operates effectively in a broad temperature range from -25°C to +70°C, suitable for use in diverse environmental conditions.
- Compact and Simple Design: Features a modular, snap-in design for easy installation, allowing quick integration into existing systems.
- Reliable and Easy Wiring: Equipped with PCB-fixed screw terminals for secure and convenient wiring. The terminal design ensures a stable connection, making it ideal for use in systems subject to vibration.
- Vibration-resistant: The screw terminal connection and spring-loaded protection system ensure a secure and stable connection even in high-vibration environments.
Size (Unit: mm)
Wiring Method

Application

Tips: What is the temperature drift?
The temperature drift of the sensor is 300 x 10⁻⁶/°C, meaning that for every degree Celsius change in temperature, the sensor’s reading may shift by 0.0003%. This minimal drift ensures stable performance across a wide temperature range, making it reliable even in environments with temperature fluctuations, such as industrial settings or outdoor installations.