Based on the part number **856441**, this is most commonly identified as a **Whirlpool / Maytag Motor Start Relay** (also known as a Potential Relay) used in residential and commercial appliances, particularly refrigerators and air conditioners. --- ### 1. Component Specifications The 856441 is an electromechanical relay designed to help start a compressor motor by temporarily engaging the start winding. | Property | Description | | :--- | :--- | | **Component Type** | Motor Start Relay (Potential Relay) | | **Common Application** | Refrigerators, Freezers, HVAC | | **Voltage Rating** | 115V - 127V AC | | **Compatibility** | Whirlpool, Maytag, Kenmore, KitchenAid, Amana | | **Function** | Disconnects start capacitor/winding once motor reaches speed | --- ### 2. How it Works (Electronic Principle) This part operates based on the **Back Electromotive Force (Back EMF)** generated by the motor. 1. **Start-up:** When power is applied, the relay is in its normally closed (NC) position, allowing current to flow through the start capacitor and the start winding of the compressor. 2. **Acceleration:** As the motor gains speed, it generates a voltage (Back EMF). 3. **Disengagement:** Once the motor reaches approximately 75% of its rated speed, the Back EMF becomes strong enough to energize the relay coil, pulling the contacts open. 4. **Running:** This removes the start winding from the circuit, and the motor continues to run on the main winding only. --- ### 3. Common Failure Symptoms If the 856441 electronic relay fails, you will typically observe the following issues: * **Clicking Sound:** The compressor tries to start, fails, and you hear a "click" (the thermal overload protector tripping). * **Warm Refrigerator:** The fans may run, but the compressor never kicks in to provide cooling. * **Humming:** The motor hums for a few seconds but cannot overcome the inertia to start spinning. --- ### 4. Technical Pinout Reference While designs vary slightly, the 856441 usually features a 3 or 4-pin configuration: ```text Pin 1: Line / Run Winding Pin 2: Start Winding (via Capacitor) Pin 5: Common / Neutral ``` *Note: Always refer to the specific wiring diagram located on the appliance chassis before installation.*