The **NR-214-R** is a specific model of a **Miniature Low-Profile Relay**, typically manufactured by companies like **NEC/Tokin** (now part of KEMET/Nexem). These relays are widely used in telecommunications, audio equipment, and medical instrumentation due to their small footprint and high sensitivity. --- ### 1. Key Technical Specifications The "R" suffix usually denotes a specific coil sensitivity or a RoHS-compliant revision. Below are the typical electronic characteristics for the NR series: | Parameter | Specification | | :--- | :--- | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Contact Material** | Silver alloy with gold overlay (for low-level switching) | | **Rated Load** | 0.5A @ 125VAC or 1A @ 30VDC | | **Max Switching Voltage** | 250VAC / 220VDC | | **Max Switching Power** | 62.5VA / 30W | | **Coil Voltage (Nominal)** | Usually 4.5V, 5V, 12V, or 24V DC (Model dependent) | | **Dielectric Strength** | 1000VAC (between open contacts) | --- ### 2. Internal Electronic Structure The NR-214-R operates on an electromagnetic principle consisting of several internal parts: * **The Coil:** A copper wire winding that creates a magnetic field when energized. The NR series is known for **high sensitivity**, meaning the coil requires very low power (often around 150mW to 200mW) to trigger. * **The Armature:** A moving component attracted by the coil's magnetic field, which physically moves the contacts. * **Gold-Overlay Contacts:** The contacts are plated with gold. This is a critical electronic feature because it prevents oxidation, allowing the relay to switch "dry circuits" (very low current signals) reliably. * **DIP Terminals:** The pins are arranged in a Dual In-line Package (DIP) format, making them compatible with standard IC sockets and breadboards. --- ### 3. Pinout Configuration The NR-214-R typically follows a standard 8-pin or 10-pin layout for DPDT relays: ```text +-------------------+ | 1 2 3 4 5 | (Top View) | 10 9 8 7 6 | +-------------------+ Pins 1 & 10: Coil connections Pins 3 & 8: Common (COM) Pins 2 & 9: Normally Closed (NC) Pins 4 & 7: Normally Open (NO) ``` --- ### 4. Common Applications * **Telecommunications:** Switching line signals in PABX or modems. * **Testing Equipment:** Used in automated test equipment (ATE) where high density is required. * **Consumer Electronics:** Signal routing in high-fidelity audio amplifiers.