The part number **8702SDO2V02SX1111** refers to a highly specific **NEMA Reversing Magnetic Contactor** manufactured by Schneider Electric under the **Square D** brand. Below is a detailed breakdown of its electronic and mechanical specifications based on the standard Square D nomenclature. --- ### 1. Technical Specifications Table | Feature | Specification | Description | | :--- | :--- | :--- | | **Product Type** | Contactor | Reversing type (Two contactors mechanically interlocked) | | **NEMA Size** | Size 2 | Rated for higher horsepower applications than Size 0 or 1 | | **Ampere Rating** | 45 A | Maximum continuous current carrying capacity | | **Pole Configuration** | 3-Pole | Standard for 3-phase AC motor control | | **Coil Voltage** | 120V AC @ 60Hz | The control circuit voltage required to energize the coil | | **Enclosure Type** | Open | No protective box; intended for mounting inside a larger control panel | | **Form S** | Separate Control | Indicates the control circuit is powered by a separate source | --- ### 2. Breakdown of the Part Number The alphanumeric string follows a modular coding system: * **8702**: The base series for Type S Reversing Contactors. * **S**: Indicates the physical frame size (Square D "Type S" design). * **D**: Represents the NEMA Size (D = Size 2). * **O**: Enclosure code for "Open" (No NEMA 1, 3R, or 12 cabinet). * **2**: Number of poles per contactor (Standard 3-pole configuration for this series). * **V02**: The Voltage code. `V02` corresponds to **120V AC at 60Hz** (or 110V AC at 50Hz). * **S**: Indicates a "Separate Control" circuit (the coil is not jumped to the line voltage). * **X1111**: These are specific **Form Codes** representing factory-installed modifications or auxiliary contacts (e.g., specific 1NO/1NC auxiliary switch configurations). --- ### 3. Application and Usage This electronic component is primarily used in industrial automation for **Motor Reversal**. * **Mechanism**: It consists of two identical contactors joined by a **mechanical interlock**. This prevents both contactors from closing at the same time, which would cause a phase-to-phase short circuit. * **Motor Control**: When the "Forward" coil is energized, the motor turns one way. When the "Reverse" coil is energized, two phases are swapped, causing the motor to rotate in the opposite direction. * **Durability**: Square D NEMA-rated devices are known for being heavy-duty and field-repairable (replaceable coils and contacts), unlike smaller IEC contactors. --- ### 4. Wiring Diagram Concept ```mermaid graph TD Line_L1[L1] --> Contactor_A Line_L2[L2] --> Contactor_B Line_L3[L3] --> Contactor_C subgraph Reversing_Logic Contactor_A -- Straight --> Motor_T1 Contactor_B -- Straight --> Motor_T2 Contactor_C -- Straight --> Motor_T3 Contactor_A_Rev -- Swapped --> Motor_T3 Contactor_B_Rev -- Straight --> Motor_T2 Contactor_C_Rev -- Swapped --> Motor_T1 end ```