The model **8736SDO2V02SX22** identifies a specific industrial **Reversing Magnetic Starter** manufactured by Schneider Electric under the Square D brand. This device is primarily used to control and protect three-phase electric motors. --- ### Technical Specifications Breakdown The alphanumeric code provides a detailed map of the component's electrical characteristics: | Component Code | Description | Specifications | | :--- | :--- | :--- | | **8736** | Type / Class | NEMA Reversing Magnetic Starter | | **S** | Size | NEMA Size 2 | | **D** | Enclosure Design | Open style (requires external panel mounting) | | **O** | Overload Relay | Type S standard melting alloy (thermal) | | **2** | Pole Configuration | 3-Pole, 3-Phase | | **V02** | Coil Voltage | 120V AC @ 60Hz / 110V AC @ 50Hz | | **S** | Auxiliary Contacts | Standard auxiliary contact configuration | | **X22** | Special Feature | Specific modification (usually 2 N.O. / 2 N.C. extra contacts) | --- ### Key Electronic & Mechanical Parts #### 1. Reversing Contactor Assembly The core of the unit consists of two mechanically and electrically interlocked contactors. * **Forward Contactor:** Connects the motor to the power source in a standard sequence (L1-T1, L2-T2, L3-T3). * **Reverse Contactor:** Swaps two of the phases (typically L1 and L3) to reverse the motor's rotation direction. * **Mechanical Interlock:** A physical safety bar that prevents both contactors from closing simultaneously, which would cause a phase-to-phase short circuit. #### 2. NEMA Size 2 Rating This indicates the power handling capability. A NEMA Size 2 starter is rated for: * **Continuous Current:** 45 Amperes. * **Maximum Horsepower:** Up to 25 HP at 460/575V or 15 HP at 230V. #### 3. Magnetic Coil (V02) The "V02" signifies a **120V AC Control Coil**. When energized, it creates an electromagnetic field that pulls the contacts closed. This allows a low-voltage control circuit (like a push button or PLC) to switch a high-voltage motor. #### 4. Thermal Overload Protection The "O" designation indicates it uses melting alloy thermal units. These sensors monitor the current drawn by the motor. If the motor draws too much current (overload), the heat melts a specific alloy, tripping the mechanism and disconnecting the motor to prevent winding burnout. --- ### Wiring Interface The device features heavy-duty screw terminals for high-power connections: * **L1, L2, L3:** Line Power Input. * **T1, T2, T3:** Load/Motor Output. * **A1, A2:** Coil Control Terminals.