The **8502SDO2V02SX20** is a specific model of a **Magnetic Contactor** from the Square D (Schneider Electric) Type S NEMA line. These devices are used to remotely switch power to electric motors or other heavy electrical loads. --- ### ## Technical Specifications Breakdown The alphanumeric code provides specific information about the internal components and electronic ratings: | Feature | Description | | :--- | :--- | | **Series/Type** | **8502S**: NEMA Magnetic Contactor (Non-reversing) | | **NEMA Size** | **D**: Size 2 (Rated for 45A continuous, up to 25 HP at 460V) | | **Enclosure** | **O**: Open type (No external metal box; for installation inside a panel) | | **Poles** | **2**: 2nd digit in sequence (Standard 3-pole configuration for 3-phase) | | **Voltage Code** | **V02**: 120V AC, 60Hz / 110V AC, 50Hz Control Coil | | **Special Suffix** | **SX20**: Custom internal configuration (Typically 2 N.O. Auxiliary contacts) | --- ### ### Core Electronic Components 1. **Electromagnetic Coil (V02):** The "heart" of the device. When 120V AC is applied to terminals A1 and A2, it creates a magnetic field that pulls the armature down to close the power contacts. 2. **Power Contacts:** High-durability silver-alloy contacts designed to break high-current arcs. For a Size 2 contactor, these are rated for up to **45 Amperes**. 3. **Auxiliary Contacts (SX20):** The "S" and "X20" indicate additional low-power contacts used for signaling. * **X20:** Usually signifies two Normally Open (N.O.) auxiliary contacts. * These are used for "Seal-in" circuits (keeping the motor running after a button is released) or status lights. 4. **Arc Chutes:** The internal structure includes ceramic or plastic barriers designed to quench the electrical arc created when the contacts open under load, preventing damage to the device. --- ### ### Application Diagram (Typical) ```mermaid graph TD A[120V Control Source] --> B[Start Button] B --> C[8502 Coil - A1] C --> D[Contactor Closes] D --> E[L1/L2/L3 Power Flows to Motor] D -.-> F[Aux Contacts X20 Close for Status] ``` --- ### ### Maintenance & Safety * **Replacement Coils:** If the device fails to click, the V02 coil can be replaced without replacing the entire unit. * **Contact Kits:** If the contacts are pitted or burned, "Size 2" contact kits are available for refurbishing. * **Note:** This is a **contactor only**. It does not provide thermal overload protection unless coupled with a separate overload relay (making it a "starter").