The **ACV-A1112-R** is a specific automotive-grade relay manufactured by **Panasonic**. It belongs to the **CV series**, which is known for its compact size and high-current switching capabilities, specifically designed for 12V automotive electrical systems. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of the ACV-A1112-R: | Parameter | Specification | | :--- | :--- | | **Contact Arrangement** | 1 Form A (SPST-NO) | | **Nominal Coil Voltage** | 12V DC | | **Max Switching Current** | 20A (Continuous) / 35A (Peak/Inrush) | | **Coil Resistance** | ~180 $\Omega$ | | **Coil Power Consumption** | ~800 mW | | **Mounting Type** | PCB (Printed Circuit Board) | | **Terminal Shape** | Solder terminals | --- ### 2. Functional Components The relay operates through several internal electronic and mechanical parts: 1. **Electromagnetic Coil:** When 12V DC is applied, the coil creates a magnetic field. In this model, the coil is optimized for low power consumption despite the high switching load. 2. **Armature and Spring:** The magnetic field pulls an internal armature. When power is removed, a mechanical spring returns the contacts to the "Open" position. 3. **Silver Alloy Contacts:** To handle the high inrush currents of automotive motors or lamps, the contacts are typically made of **Silver Tin Oxide (AgSnO2)**. This material resists welding and electrical erosion. 4. **Enclosure:** The "R" suffix often denotes a **Flux-resistant** or sealed type, protecting the internal mechanism from dust and engine bay contaminants. --- ### 3. Common Applications Due to its 20A rating and small footprint, the ACV-A1112-R is frequently found in: * **Power Windows:** Controlling the motor direction and stop/start. * **Power Seats:** Adjusting electronic seat positioning. * **Wiper Motors:** Managing intermittent or high-speed wiper functions. * **Central Locking Systems:** Actuating door locks via the vehicle's BCM (Body Control Module). --- ### 4. Comparison to Standard Relays | Feature | ACV-A1112-R (CV Series) | Standard General Purpose Relay | | :--- | :--- | :--- | | **Size** | Ultra-miniature (saves PCB space) | Larger / Bulkier | | **Heat Resistance** | High (Automotive Grade) | Moderate | | **Vibration Resistance** | Excellent (Tested for car use) | Standard |