The **WJM-14A-R** is a specific model of a **Miniature Intermediate Power Relay**. These components are widely used in industrial automation, control panels, and PCB designs to control high-power loads using low-power signals. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. General Specifications The WJM series typically falls under the category of **Electromechanical Relays (EMR)**. | Feature | Specification (Typical) | | :--- | :--- | | **Contact Form** | 1A (SPST-NO), 1B (SPST-NC), or 1C (SPDT) | | **Mounting Type** | PCB Mount (Through-hole) | | **Contact Material** | Silver Alloy (AgSnO2 or AgNi) | | **Package Style** | Sealed or Flux-tight | --- ### 2. Electrical Characteristics These parts are designed to bridge the gap between logic-level circuits and high-voltage machinery. #### A. Coil Side (Input) The coil is the "control" part of the relay. * **Nominal Voltage:** Usually available in 5V, 12V, or 24V DC. * **Power Consumption:** Typically low (approx. 200mW to 450mW) to allow driving via transistors or optocouplers. #### B. Contact Side (Output) The contacts handle the actual switching of the load. * **Max Switching Current:** Generally rated up to **10A - 16A** (Verify specific datasheet for "14A" variant). * **Max Switching Voltage:** 250V AC / 30V DC. * **Life Expectancy:** * *Electrical:* ~100,000 operations. * *Mechanical:* ~10,000,000 operations. --- ### 3. Pinout and Internal Structure The "R" suffix often denotes a specific pin orientation or a RoHS-compliant environmental rating. * **Coil Pins (2):** Connected to the control circuit. * **Common (COM):** The moving part of the switch. * **Normally Open (NO):** Circuit is closed only when the coil is energized. * **Normally Closed (NC):** Circuit is closed when the coil is at rest (only on SPDT models). --- ### 4. Application Use Cases * **Smart Home:** Switching lights, fans, or heaters. * **Industrial:** PLC output modules and motor starters. * **Power Supplies:** Inrush current limiting and circuit protection. --- ### 5. Schematic Symbol ```text (Coil) ----( s )---- | | [ ] [ ] | | | / | |-----/ -----| (Switch) ```