The part number **10MS-40-R** typically refers to a **High-Voltage Reed Relay** manufactured by companies like **Meder Electronic (now Standex Electronics)**. These components are designed to switch high voltages in a compact PCB-mount package. --- ### ## Technical Specifications Below are the general characteristics for the 10MS series high-voltage reed relays: | Parameter | Typical Value | | :--- | :--- | | **Contact Form** | 1 Form A (SPST-NO - Normally Open) | | **Coil Voltage** | 10 VDC (Standard) | | **Switching Voltage** | Up to 4,000 VDC (4kV) | | **Breakdown Voltage** | Up to 10,000 VDC (10kV) | | **Switching Current** | Max 1.5 Amps | | **Carry Current** | Max 2.5 Amps | | **Contact Resistance** | < 150 mΩ | | **Termination** | PCB Through-Hole | --- ### ### Key Features 1. **High Isolation:** The "MS" series is specifically engineered for high-voltage isolation between the coil and the reed switch contacts, as well as across the open contacts. 2. **Compact Design:** Despite its high-voltage rating, it maintains a small footprint suitable for high-density printed circuit board (PCB) layouts. 3. **Hermetically Sealed:** The reed switch is sealed in glass within the housing, protecting it from dust, moisture, and oxidation, which ensures a long mechanical life. 4. **Low Power Consumption:** Reed relays require very little power to actuate the coil compared to traditional electromechanical relays. --- ### ### Common Applications Because of its ability to handle kilovolt-level switching, the 10MS-40-R is commonly found in: * **Medical Equipment:** Defibrillators and imaging systems. * **Test & Measurement:** Automated Test Equipment (ATE) and high-pot testers. * **Power Supplies:** High-voltage power supply sequencing. * **Cable Testers:** Insulation resistance testing. --- ### ### Wiring Diagram Representation ```text [ Coil ] (1)---(S)---(2) | (3)-----|/|-----(4) [ Contact ] ``` * **Pins 1 & 2:** Coil Drive (10V nominal). * **Pins 3 & 4:** High-Voltage Switching Contacts.