The **48NDR-2YC-R** is a specific model of a **Miniature Power Relay** typically manufactured by companies like **Goodsky** or similar relay specialists. It is designed for PCB mounting and is used for switching electrical circuits. --- ### 1. Technical Specifications The part number can be broken down to understand its core electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Relay Type** | Electromagnetic Miniature Relay | | **Coil Voltage** | 48V DC | | **Contact Configuration** | DPDT (2 Form C) | | **Contact Rating** | Usually 5A to 8A at 250VAC/30VDC | | **Mounting Type** | Through-Hole (PCB) | | **Terminal Style** | Solder Pins | --- ### 2. Key Internal Components The 48NDR-2YC-R consists of several critical sub-parts that work together to perform the switching action: * **Electromagnetic Coil (48V):** When 48V DC is applied, it creates a magnetic field. * **Armature:** A moving piece of metal that is pulled by the magnetic field toward the coil. * **Contacts (2 Form C):** * **Common (COM):** The input terminal. * **Normally Closed (NC):** The path connected when the coil is off. * **Normally Open (NO):** The path connected when the coil is energized. * **Spring Mechanism:** Returns the armature to its original position once power is removed from the coil. --- ### 3. Part Number Breakdown (Nomenclature) While naming conventions can vary slightly by brand, the code usually follows this logic: 1. **48:** Indicates the **Coil Voltage** (48 Volts DC). 2. **NDR:** The series identifier (Standard Miniature Power Relay). 3. **2:** Number of poles (2 Poles / Double Pole). 4. **YC:** Contact arrangement (Form C / Change-over contacts). 5. **R:** Often denotes **RoHS Compliance** or specific packaging (Tape/Reel). --- ### 4. Common Applications Due to its 48V coil and dual-pole configuration, this relay is frequently found in: * **Telecommunications Equipment:** Where 48V power rails are standard. * **Industrial Controls:** For switching two separate loads simultaneously. * **Power Supplies:** Used as a safety cutout or signal router. * **HVAC Systems:** For controlling fans and compressors.