The **48NDR-2C2A-R** is a specific model of a **Miniature Intermediate Power Relay**, typically manufactured by brands like **OEG (a TE Connectivity brand)** or similar industrial control manufacturers. It is designed for switching electrical loads in control circuits. --- ### 1. Part Number Breakdown While naming conventions can vary slightly by manufacturer, the code generally breaks down as follows: | Segment | Meaning | Description | | :--- | :--- | :--- | | **48** | Nominal Voltage | Indicates a **48V DC** coil voltage. | | **NDR** | Series Type | Represents the physical frame size and sealing (usually "Dust Protected"). | | **2C** | Contact Form | **DPDT** (Double Pole Double Throw) – 2 Form C contacts. | | **2A** | Contact Rating | Often refers to a specific contact material or a 2-Ampere rating (check datasheet for specific load limits). | | **-R** | Feature | Usually indicates **RoHS Compliance** (Lead-free). | --- ### 2. Technical Specifications Below are the typical technical parameters for this class of relay: | Feature | Specification | | :--- | :--- | | **Coil Voltage** | 48V DC | | **Contact Arrangement** | 2 Form C (DPDT) | | **Max Switching Current** | Typically 1A to 5A (depending on the specific sub-series) | | **Mounting Type** | Through-hole PCB mount | | **Coil Power** | Approx. 150mW to 500mW | | **Dielectric Strength** | ~1000V AC between open contacts | --- ### 3. Key Components & Construction The relay consists of several internal electronic and mechanical parts: 1. **Electromagnetic Coil:** A copper winding around an iron core. When 48V DC is applied, it creates a magnetic field. 2. **Armature:** A moving lever attracted by the magnetic field of the coil. 3. **Contacts:** Usually made of **Silver Alloy** (Ag) to prevent oxidation and ensure good conductivity. * **Normally Open (NO):** Circuit is open until the coil is energized. * **Normally Closed (NC):** Circuit is closed until the coil is energized. 4. **Spring Mechanism:** Returns the armature to its original position once power is removed from the coil. 5. **Housing:** A plastic casing (often PBT) that protects the internal components from dust. --- ### 4. Common Applications * **Telecommunications:** Signal switching in exchanges. * **Industrial Controls:** Interfacing between low-power PLCs and higher-power actuators. * **Security Systems:** Controlling alarms or electronic locks. * **Office Automation:** Used in printers and photocopiers for motor or heater control.