The **WJPA-2AC-R/Q** is a specific technical component designation typically associated with **Power Relay** or **Micro-Relay** modules used in automotive and industrial control systems. Below is a detailed breakdown of its electronic characteristics and structural parts. --- ### 1. Technical Specifications The part number usually corresponds to a high-current electromagnetic relay designed for PCB mounting. | Parameter | Typical Value | | :--- | :--- | | **Contact Form** | 2 Form A (DPST-NO) or 2 Form C (DPDT) | | **Nominal Voltage** | 12V DC / 24V DC (Variant dependent) | | **Max Switching Current** | 20A to 30A (per contact) | | **Contact Material** | Silver Alloy (AgSnO2) for arc resistance | | **Mounting Type** | Through-hole (PCB) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Internal Electronic Components The device consists of several critical sub-assemblies that work together to perform the switching function: #### A. The Electromagnetic Coil * **Function:** Converts electrical energy into magnetic force. * **Composition:** Fine copper wire wound around a plastic bobbin. * **Sensitivity:** Designed for low power consumption to allow triggering by logic-level circuits (via a transistor). #### B. Contact System * **Stationary Contacts:** Fixed terminals soldered to the PCB. * **Movable Contacts (Armature):** A spring-loaded metal plate that moves when the coil is energized. * **R/Q Suffix Significance:** Often denotes the specific contact material or the sealing type (e.g., "Reflow-solderable" or "Quiet" operation). #### C. Mechanical Housing * **Casing:** PBT (Polybutylene Terephthalate) plastic, which is flame retardant and chemical resistant. * **Sealing:** Usually epoxy-sealed to protect internal parts from oxidation and flux during soldering. --- ### 3. Application Use Cases Because of its high current rating and compact footprint, this part is frequently found in: 1. **Automotive Modules:** Power windows, central locking, and seat adjustment. 2. **HVAC Systems:** Controlling fan motors and compressors. 3. **Industrial Automation:** Activating solenoids or small DC motors. --- ### 4. Circuit Diagram Representation In a schematic, the WJPA-2AC is represented as follows: ```text [Control Side] [Load Side] (VCC) ---[ Coil ]--- (GND) (Load In) | | [Magnetic Force] ----> [ Switch ] | (Load Out) ``` ---