The **RCEC400GS1003JB** is a high-power, chassis-mount cermet resistor manufactured by **Vishay Sfernice**. It is specifically designed for power electronics applications where high reliability and significant heat dissipation are required. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Vishay Sfernice | | **Resistance Value** | 100 kΩ (1003 code) | | **Tolerance** | ± 5% (J code) | | **Power Rating** | 400W (at 85°C case temperature) | | **Technology** | Thick Film (Cermet) | | **Temperature Coefficient** | ± 150 ppm/°C | | **Operating Temperature** | -55°C to +155°C | | **Dielectric Strength** | 6000 V | --- ### 2. Physical Construction and Features * **Chassis Mount Design:** This resistor is housed in a cold-rolled, rectangular casing designed to be bolted directly onto a heatsink. The "GS" designation refers to the specific physical configuration and terminal style. * **Isolation:** It offers high dielectric strength (up to 6kV), meaning the internal resistive element is electrically isolated from the metal casing, allowing it to be mounted on grounded metal surfaces. * **Non-Inductive:** Because it uses thick-film technology rather than wire-wound coils, it has very low inductance. This makes it suitable for high-frequency applications. * **Termination:** Usually features screw-on terminals (M4 or M5 depending on the exact sub-series) to handle high current and provide secure connections in high-vibration environments. --- ### 3. Decoding the Part Number (RCEC400GS1003JB) | Segment | Meaning | | :--- | :--- | | **RCEC400** | Series name and Power Rating (400 Watts) | | **GS** | Style/Configuration of the housing and terminals | | **1003** | Resistance Value: First 3 digits are significant (100), the 4th is the multiplier (10^3). 100 x 1,000 = **100,000 Ω (100kΩ)** | | **J** | Tolerance: **± 5%** | | **B** | Packaging (Bulk) | --- ### 4. Common Applications Due to its high power rating and robust construction, this part is typically used in: 1. **Variable Speed Drives:** Used as a braking resistor to dissipate excess energy. 2. **Power Supplies:** Used as a bleeder resistor for large capacitor banks. 3. **Inverters/Converters:** Used in snubbers or as a dummy load during testing. 4. **Traction/Rail:** Used in power control systems for electric trains or heavy industrial machinery.