The **WADS-112-R** is a specific model of a **Miniature Intermediate Power Relay**, typically manufactured by brands like **Weller** or private-labeled for various industrial control systems. It is designed to act as an electrically operated switch, allowing a low-power signal to control a much higher-power circuit. --- ### 1. Key Technical Specifications The model name "WADS-112-R" follows a standard nomenclature for industrial relays. Below are the typical electronic characteristics: | Parameter | Specification | |:---|:---| | **Coil Voltage** | 12V DC (indicated by the "12") | | **Contact Configuration** | SPDT (1 Form C) or SPST (1 Form A) | | **Contact Rating** | 5A to 10A @ 250VAC / 30VDC | | **Mounting Type** | PCB Through-Hole | | **Terminal Material** | Silver Alloy (AgSnO2 or AgNi) | | **Construction** | Sealed (Wash-tight) | --- ### 2. Breakdown of the Model Code To understand the electronic parts, we can deconstruct the part number: * **WADS**: Series identifier (Miniature Power Relay). * **1**: Number of poles (Single Pole). * **12**: The nominal coil voltage required to energize the relay (**12 Volts DC**). * **R**: Often indicates the sealing type (e.g., **RoHS Compliant** or **Flux-tight/Sealed**). --- ### 3. Internal Components The WADS-112-R consists of several critical electronic and mechanical sub-parts: 1. **Electromagnetic Coil:** A copper wire winding that creates a magnetic field when 12V DC is applied. 2. **Armature:** A moving piece of metal that is pulled toward the coil when energized. 3. **Contacts:** The "switching" part. Usually made of silver alloy to resist "arcing" and welding under high current loads. 4. **Spring:** Returns the armature to its original position once the power to the coil is removed. 5. **Yoke/Frame:** Provides the structural support and completes the magnetic circuit. --- ### 4. Typical Applications Because of its small footprint and 12V coil, this part is commonly found in: * **Household Appliances:** Washing machines, microwave ovens. * **Automotive Electronics:** Controlling lights or small motors. * **HVAC Systems:** Controlling fans or solenoid valves. * **Industrial Automation:** Interfacing PLCs with high-voltage actuators. --- ### 5. Wiring Diagram Logic The pinout usually follows this logic: ```text [Coil Pin 1] ---- (Internal Coil) ---- [Coil Pin 2] [Common (COM)] | |---- [Normally Closed (NC)] <-- Connected when coil is OFF o \ o-- [Normally Open (NO)] <-- Connected when coil is ON ```