The **K-356-R** typically refers to a high-precision, high-voltage relay or a specific industrial relay socket/component often used in aerospace, defense, or high-reliability power systems. Depending on the manufacturer (such as Leach International or similar aerospace suppliers), these parts are engineered to withstand extreme environments. ### Core Electronic Specifications The technical characteristics of the K-356-R series usually revolve around high-power switching and mechanical durability. | Feature | Typical Specification | | :--- | :--- | | **Component Type** | Electromechanical Relay | | **Contact Arrangement** | 3PDT (3 Pole, Double Throw) or 4PDT | | **Current Rating** | 5A to 10A (depending on load type) | | **Voltage Rating** | 28V DC / 115V AC (400Hz) | | **Coil Voltage** | Typically 28V DC | | **Enclosure** | Hermetically Sealed | --- ### Key Electronic Sub-components #### 1. The Coil Assembly The "heart" of the relay. When a specific voltage (usually 28V DC) is applied, the coil generates a magnetic field. In the K-356-R, the coil is designed for high efficiency to prevent overheating during continuous duty cycles. #### 2. Hermetic Sealing Unlike standard consumer relays, the K-356-R is **hermetically sealed**. The internal electronic contacts are housed in a vacuum or inert gas environment. This prevents: * **Oxidation:** Contacts won't rust or degrade. * **Arcing:** High-voltage jumps are minimized. * **Altitude Issues:** Essential for aircraft electronics where air pressure changes. #### 3. Contact Materials The contacts are usually made of **Silver-Cadmium Oxide** or **Gold-plated alloys**. This ensures low contact resistance and prevents the "welding" of contacts under high-current spikes. #### 4. Suppression Circuitry Many "R" suffix versions of these relays include an internal **diode or transient voltage suppressor (TVS)** across the coil. This protects the driving electronics from "back EMF" (the voltage spike that occurs when the relay is turned off). --- ### Application Context The K-356-R is primarily found in: * **Avionics Power Distribution:** Switching AC/DC power in cockpits. * **Radar Systems:** Handling high-frequency pulse power. * **Ground Support Equipment:** Reliable switching for military vehicles.