The **HVS-31-R** is a high-voltage, reed-based switching component typically used in specialized industrial and medical applications. It is designed to handle high isolation voltages while maintaining a compact form factor. --- ### 1. Core Technical Specifications The "R" suffix generally denotes a specific mounting style (often through-hole or right-angle) or a RoHS-compliant version of the HVS series. | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Max Switching Voltage** | 10,000 (10kV) | VDC | | **Max Switching Current** | 1.5 - 3.0 | Amps | | **Contact Resistance** | < 100 | mΩ | | **Isolation Voltage** | 15,000 (15kV) | VDC | | **Operating Temperature** | -20 to +85 | °C | --- ### 2. Key Electronic Components & Construction #### A. Vacuum/Gas Filled Reed Switch The heart of the HVS-31-R is a hermetically sealed glass envelope. * **Contacts:** Usually made of Rhodium or Tungsten to resist "pitting" caused by high-voltage arcing. * **Atmosphere:** Filled with high-pressure Nitrogen or a vacuum to prevent oxidation and suppress arcs during disconnection. #### B. Electromagnetic Coil To actuate the switch, a copper wire coil is wrapped around the reed. * **Control Logic:** Low voltage (typically 5V, 12V, or 24V DC) is applied to the coil to create a magnetic field that closes the high-voltage contacts. * **Efficiency:** Designed for low power consumption while providing enough magnetic flux to ensure a firm contact closure. #### C. Encapsulation (Potting) The entire assembly is encapsulated in a high-dielectric epoxy resin. * **Purpose:** This prevents "creepage" (current traveling across the surface) and "clearance" issues between the high-voltage leads and the low-voltage control pins. --- ### 3. Application Use Cases Due to its high isolation rating, the HVS-31-R is used in: 1. **Defibrillators:** Managing the high-energy pulse delivery. 2. **Cable Testers:** Performing Hi-Pot (High Potential) testing on industrial wiring. 3. **Mass Spectrometers:** Switching high-voltage power supplies within the analytical chamber. 4. **Laser Power Supplies:** Controlling the ignition sequence of gas lasers. --- ### 4. Circuit Implementation Example When integrating this part into a PCB, a flyback diode is essential to protect the driving transistor from the coil's inductive kickback. ```cpp // Pseudocode for controlling the HVS-31-R via a Microcontroller void toggleHighVoltage(bool state) { if (state == ON) { digitalWrite(HV_RELAY_PIN, HIGH); // Activates the coil } else { digitalWrite(HV_RELAY_PIN, LOW); // Breaks the high-voltage circuit } } ```