The **DRS-3-R/E** is a specific electronic component typically identified as a **High-Voltage Reed Relay** manufactured by **Standex Electronics** (formerly MEDER electronic). These components are designed to provide high galvanic isolation and are frequently used in medical equipment, test and measurement devices, and high-voltage power supplies. --- ### 1. Key Technical Specifications The "DRS-3" refers to the core reed switch model, while the suffix indicates the specific contact configuration and sensitivity. | Parameter | Specification (Typical) | | :--- | :--- | | **Contact Form** | Form A (Normally Open) | | **Switching Power** | Up to 100 W | | **Switching Voltage** | Up to 1,000 VDC | | **Breakdown Voltage** | Up to 4,000 VDC | | **Switching Current** | Max 3.0 A | | **Carry Current** | Max 5.0 A | | **Contact Resistance** | < 150 mΩ | --- ### 2. Core Electronic Components The DRS-3-R/E consists of three primary elements that define its electronic behavior: 1. **Reed Switch (Internal):** * Consists of two ferromagnetic blades (reeds) hermetically sealed in a glass envelope filled with inert gas. * The contacts are usually plated with **Rhodium** or **Ruthenium** to ensure low resistance and long life under high-voltage conditions. 2. **Electromagnetic Coil:** * The "relay" version contains a copper wire coil wrapped around the reed switch. When current flows through the coil, it creates a magnetic field that pulls the reeds together to close the circuit. 3. **Isolation Materials:** * The glass tube provides high dielectric strength, ensuring that the high voltage on the contact side does not leak into the low-voltage control side (coil). --- ### 3. Functional Features * **Galvanic Isolation:** Provides a physical gap when open, preventing any current flow between the input and output. * **Hermetic Sealing:** Because the contacts are sealed in glass, they are protected from corrosion, oxidation, and dust, making them highly reliable in harsh environments. * **Low Power Consumption:** The coil requires very little DC power to maintain the closed state compared to mechanical contactors. --- ### 4. Application Areas These parts are commonly found in the following electronic circuits: * **Defibrillators:** Handling the high-voltage pulse discharge. * **Cable Testers:** Switching between high-voltage test points. * **Photovoltaic Systems:** Monitoring insulation resistance in solar inverters. * **In-Circuit Test (ICT):** Providing clean signals in automated test equipment. ---