The **HAS-40-R/Q** is a high-performance open-loop current transducer designed by **LEM**. It is primarily used for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic control). --- ### 1. Key Technical Specifications The following table summarizes the core electronic characteristics of the HAS-40-R/Q: | Parameter | Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 40 A | | **Measuring Range ($I_{pm}$)** | ±120 A (at ±15V) | | **Supply Voltage ($V_c$)** | ±15 V (±5%) | | **Output Signal** | Voltage (±4 V at $I_{pn}$) | | **Accuracy** | ±1% of $I_{pn}$ | | **Bandwidth** | DC to 50 kHz | | **Response Time** | < 3 μs | --- ### 2. Internal Electronic Architecture The device operates on the **Hall Effect** principle. Its internal structure consists of three main components: 1. **Magnetic Core:** A high-permeability ring that concentrates the magnetic flux generated by the primary current. 2. **Hall Generator:** A semiconductor sensor placed in the air gap of the magnetic core. It produces a small voltage proportional to the magnetic flux. 3. **Signal Conditioning Circuit:** An internal amplifier that stabilizes the Hall voltage and converts it into a usable output voltage (typically 4V for the nominal 40A input). --- ### 3. Pin Configuration and Connections The HAS series typically uses a 4-pin connection layout for the secondary side: * **Pin 1 (+):** Positive Supply Voltage (+15V) * **Pin 2 (-):** Negative Supply Voltage (-15V) * **Pin 3 (M):** Output Signal (Measurement) * **Pin 4 (0V):** Ground/Common Reference --- ### 4. Core Features and Applications * **Galvanic Isolation:** Physical separation between the power cable (primary) and the sensor electronics, ensuring safety in high-voltage environments. * **Low Power Consumption:** Very efficient for battery-operated or sensitive monitoring systems. * **Applications:** * Variable speed drives (AC/DC). * Uninterruptible Power Supplies (UPS). * Switched Mode Power Supplies (SMPS). * Battery management systems. ---