The model number **8502SHO2V05_V01** corresponds to a specific configuration of a Square D (Schneider Electric) **Type S NEMA Magnetic Contactor**. These components are heavy-duty industrial devices used for switching electrical power circuits. --- ## 1. Part Number Breakdown Understanding the electronic and mechanical capabilities requires decoding the nomenclature: | Code | Component Segment | Description | | :--- | :--- | :--- | | **8502** | Class Type | NEMA Magnetic Contactor (Non-reversing) | | **S** | Series | Type S (Heavy Duty) | | **H** | NEMA Size | Size 3 (90 Amperes continuous rating) | | **O** | Enclosure | Open Style (No metal box; for installation in a custom panel) | | **2** | Number of Poles | 2-Pole configuration | | **V05** | Voltage Code | 480V AC, 60Hz / 440V AC, 50Hz Coil | | **V01** | Variation | Specific factory modification (often 120V secondary control or specific accessory) | --- ## 2. Key Electronic Components ### A. The Magnetic Coil (Solenoid) The heart of the unit is the **V05** coil. - **Function:** When energized with 480V, it creates a magnetic field that pulls the armature down. - **Inrush/Sealed Power:** These coils have a high "inrush" current to close the contacts and a lower "sealed" current to hold them closed. ### B. Power Contacts - **Material:** Typically Silver-Cadmium Oxide. - **Rating:** Size 3 units are rated for **90A** of continuous current. - **Arc Suppressors:** The unit includes arc chutes or cooling fins to extinguish the electrical arc created when the contacts open under load. ### C. Auxiliary Contacts The unit likely features side-mounted auxiliary contacts used for control logic (e.g., signaling a PLC that the motor is running or interlocking with another starter). --- ## 3. Technical Specifications | Feature | Specification | | :--- | :--- | | **NEMA Size** | 3 | | **Continuous Ampere Rating** | 90 Amperes | | **Voltage (Coil)** | 480V AC @ 60 Hz | | **Phase/Poles** | 1-Phase (2-Pole) | | **Motor Power (HP)** | ~15 HP @ 230V / 30 HP @ 460V | | **Mounting Type** | Surface (Panel Mount) | --- ## 4. Maintenance & Safety - **Visual Inspection:** Check for "pitting" on the contacts, which indicates heavy electrical arcing. - **Coil Continuity:** Use a multimeter to check the resistance of the V05 coil; an infinite reading indicates a blown coil. - **Mechanical Life:** Type S contactors are modular; the coil and contacts can be replaced without removing the entire baseplate.