The **8502SHO2V07** is a specific model of a NEMA-rated magnetic contactor manufactured by Square D (Schneider Electric). These devices are used primarily for switching high-power electrical loads, such as large motors or heating elements, using a low-power control signal. --- ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Manufacturer** | Square D (Schneider Electric) | | **Product Type** | Magnetic Contactor | | **NEMA Size** | Size 00 | | **Pole Configuration** | 3-Pole (3P) | | **Coil Voltage** | 550V AC @ 50Hz / 600V AC @ 60Hz | | **Current Rating** | 9 Amperes (Continuous) | | **Enclosure Type** | Open (No physical outer box) | | **Application** | Non-Reversing Motor Control | --- ### 2. Breakdown of the Part Number The alphanumeric code provides a detailed description of the unit's physical and electrical properties: * **8502**: Designates the product class (Type S Magnetic Contactor). * **S**: Indicates the physical frame size family. * **H**: Refers to the specific design/generation within the series. * **O**: Represents the enclosure type ("Open" — intended for mounting inside a larger control panel). * **2**: Indicates the NEMA size (Size 00). * **V07**: This is the **Coil Voltage Code**. It specifies that the electromagnetic coil is designed for **600VAC at 60Hz** or **550VAC at 50Hz**. --- ### 3. Key Internal Components #### A. The Electromagnetic Coil (V07) The "heart" of the contactor. When 600V is applied to the coil terminals, it creates a magnetic field that pulls the internal plunger down, closing the power contacts. #### B. Power Contacts (3 Poles) These are heavy-duty silver-cadmium oxide pads. They are designed to withstand the arcing that occurs when breaking a 9A inductive load. Being a 3-pole device, it can switch all three phases of a 3-phase motor simultaneously. #### C. Return Spring Once power is removed from the coil, this mechanical spring forces the contacts back into the "Open" position, safely disconnecting the load. #### D. Auxiliary Contacts (Optional) While the base unit handles the main power, these contactors often feature side-mounted auxiliary contacts used for signaling (e.g., turning on a "Run" light on a control panel). --- ### 4. Typical Wiring Logic ```mermaid graph TD A[600V Control Signal] --> B[Coil Terminals A1/A2] B --> C{Magnetic Field Created} C --> D[Main Contacts L1, L2, L3 Close] D --> E[Power Flows to Motor T1, T2, T3] ```