The **HAS-52-R** is a specific type of **Hall Effect Current Sensor** manufactured by **LEM**. It is designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). --- ### 1. Key Technical Specifications The following table summarizes the primary electronic characteristics of the HAS-52-R: | Feature | Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 50 A | | **Measuring Range ($I_{pm}$)** | ± 150 A | | **Secondary Output Voltage ($V_{out}$)** | ± 4 V (at $I_{pn}$) | | **Supply Voltage ($V_c$)** | ± 15 V (± 5%) | | **Accuracy** | ± 1% of $I_{pn}$ | | **Linearity** | < ± 1% | | **Bandwidth (-3dB)** | DC ... 50 kHz | --- ### 2. Operating Principle The device operates on the **Open Loop Hall Effect** principle: 1. **Magnetic Induction:** When current flows through the primary hole, it creates a magnetic field. 2. **Hall Cell:** A Hall effect sensor located in the air gap of a magnetic core measures the magnetic flux density. 3. **Signal Conditioning:** The internal electronics amplify the Hall voltage to provide a standard output (4V at nominal current) that is directly proportional to the primary current. --- ### 3. Connection and Pinout The HAS-52-R typically features a 4-pin connection interface for its secondary circuit: * **Pin 1 (+):** Positive Supply Voltage (+15V) * **Pin 2 (-):** Negative Supply Voltage (-15V) * **Pin 3 (M):** Output Signal (Measurement) * **Pin 4 (0V):** Ground / Common --- ### 4. Advantages & Applications #### Advantages: * **Galvanic Isolation:** High safety as there is no physical contact between the measured high current and the control electronics. * **Low Power Loss:** Since the primary current passes through a busbar or wire, there is negligible insertion loss. * **Versatility:** Capable of measuring both DC and high-frequency AC signals. #### Common Applications: * **Variable Speed Drives:** Monitoring motor current. * **Uninterruptible Power Supplies (UPS):** Managing battery charge/discharge. * **Welding Equipment:** Controlling output current levels. * **Solar Inverters:** Monitoring DC input from panels.