The **WSBS-34D-R** is a high-precision, low-resistance shunt resistor manufactured by Vishay Dale. It is specifically designed for high-current battery sensing applications, commonly found in automotive and renewable energy systems. --- ### 1. Key Electronic Specifications The "WSBS" (Power Metal Strip Battery Sensor) series is engineered for extreme stability. | Feature | Specification | | :--- | :--- | | **Resistance Range** | Typically 50 $\mu\Omega$ to 100 $\mu\Omega$ | | **Power Rating** | Up to 36 W (design dependent) | | **Tolerance** | ±1% or ±5% | | **Operating Temperature** | -65 °C to +170 °C | | **Inductance** | Very Low (< 5 nH) | | **TCR (Temp. Coefficient)** | < 20 ppm/°C (highly stable) | --- ### 2. Structural & Material Composition The electronic performance of this part is derived from its unique construction: * **Solid Metal Alloy:** It uses a proprietary manganese-copper alloy as the resistive element. This provides a low Thermal EMF (Electromotive Force), which prevents voltage errors caused by temperature gradients. * **Welded Design:** The resistive element is electron-beam welded to copper terminals, ensuring minimal resistance at the junction and maximum current-carrying capacity. * **All-Welded Construction:** This makes it robust against mechanical shock and vibration, which is critical for automotive environments. --- ### 3. Functional Application In a circuit, the WSBS-34D-R acts as a **Current Sense Resistor**. It is placed in series with the battery's negative terminal. #### How it works: 1. **Current Flow:** High current (hundreds of Amperes) flows through the shunt. 2. **Voltage Drop:** Because the resistance is precisely known (e.g., $100 \mu\Omega$), the voltage drop across the shunt ($V = I \times R$) is measured. 3. **BMS Integration:** A Battery Management System (BMS) uses this voltage to calculate State of Charge (SoC) and State of Health (SoH). --- ### 4. Part Number Breakdown: `WSBS-34D-R` * **WSBS:** Power Metal Strip® Battery Sensor. * **34:** Refers to the physical size/footprint. * **D:** Design variation (specific lead configuration or thickness). * **R:** Denotes the resistance value/decimal location (usually followed by numerical values, e.g., L100 for 0.1 m$\Omega$). ---