The **R3-NC3-R** is a specific electronic component typically identified as a **Miniature Industrial Power Relay**, often associated with brands like *CHINT* or other industrial automation manufacturers. It is designed to control high-power circuits using a low-power signal. --- ### 1. Technical Specifications Below are the typical technical parameters for the R3-NC3-R series: | Feature | Specification | | :--- | :--- | | **Contact Form** | 3PDT (3 Form C) | | **Number of Pins** | 11 Pins (Plug-in type) | | **Contact Rating** | 10A at 250VAC / 30VDC | | **Coil Voltages** | Available in 12VDC, 24VDC, 110VAC, 230VAC | | **Mechanical Life** | $\ge 1 \times 10^7$ operations | | **Mounting Type** | Socket mount (usually DIN rail) | --- ### 2. Component Breakdown The R3-NC3-R consists of several critical internal and external parts: #### A. Internal Mechanisms * **Electromagnetic Coil:** When energized, it creates a magnetic field that moves the armature. * **Armature:** A moving lever that shifts the position of the contacts. * **Contacts (Silver Alloy):** The 3PDT configuration means it has 3 poles, each with a "Normally Open" (NO) and "Normally Closed" (NC) contact. * **Return Spring:** Returns the armature to its original position once power is removed from the coil. #### B. External Features * **LED Indicator:** Most models include a built-in LED to show the status of the coil (on/off). * **Manual Test Button:** A small tab (often red for AC, blue for DC) that allows technicians to manually override the relay for testing. * **Clear Plastic Housing:** Allows for visual inspection of contact wear or arcing. --- ### 3. Pin Configuration (11-Pin Layout) Since this is a **3-pole relay**, the 11 pins are generally mapped as follows: 1. **Pins 1, 6, 11:** Common (COM) terminals. 2. **Pins 3, 7, 10:** Normally Open (NO) terminals. 3. **Pins 4, 5, 8:** Normally Closed (NC) terminals. 4. **Pins 2 & 9:** Coil power supply. --- ### 4. Common Applications * **Motor Control:** Switching small 3-phase motors or heavy contactors. * **PLC Interfacing:** Acting as an intermediary between sensitive PLC outputs and heavy industrial loads. * **Signal Isolation:** Separating high-voltage power circuits from low-voltage control circuits.