The **CT01-200-R** is a specific model of a **Current Transformer (CT)** designed for mounting on Printed Circuit Boards (PCBs). It is primarily used for AC current sensing and monitoring in electronic circuits. ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the CT01-200-R: | Parameter | Value / Specification | | :--- | :--- | | **Turns Ratio** | 1:200 | | **Current Rating** | Typically up to 10A - 20A (Application dependent) | | **Frequency Range** | 50Hz / 60Hz (Standard Mains Frequency) | | **Secondary Resistance** | ~14.0 Ohms (Nominal) | | **Dielectric Strength** | 2500V AC (Insulation between primary and secondary) | | **Mounting Type** | Through-hole PCB Mount | | **Encapsulation** | Epoxy Resin (for environmental protection) | --- ### 2. Functional Principles The CT01-200-R operates on the principle of magnetic induction: 1. **Primary Input:** The conductor carrying the current to be measured is passed through the center hole of the transformer. This acts as a "single turn" primary. 2. **Transformation:** The magnetic field generated by the primary current induces a smaller current in the secondary winding based on the **1:200 ratio**. 3. **Measurement:** For every 200 Amps flowing through the primary, 1 Amp is produced at the secondary terminals (scaled down linearly). --- ### 3. Application Circuit Example To read the current with a Microcontroller (like an Arduino or ESP32), you must convert the output current into a measurable voltage using a **burden resistor**. ```cpp // Logic for calculating RMS Current via a Burden Resistor float get_current(float analog_voltage) { float turns_ratio = 200.0; float burden_resistor = 100.0; // Example 100 Ohm resistor // I_secondary = V_measured / R_burden // I_primary = I_secondary * turns_ratio float i_primary = (analog_voltage / burden_resistor) * turns_ratio; return i_primary; } ``` --- ### 4. Typical Applications * **Energy Meters:** Measuring household or industrial power consumption. * **Overload Protection:** Sensing when a motor or device is drawing too much current to trigger a shutdown. * **Smart Plugs:** Providing real-time power monitoring in IoT devices. * **Power Supplies:** Monitoring AC input health and efficiency. ---