The **8536SHO2V03H30** is a specific NEMA-rated magnetic motor starter from the Square D (Schneider Electric) Type S line. It is primarily used for across-the-line starting and stopping of AC motors. --- ### 1. Technical Specifications Breakdown | Component | Specification | Description | | :--- | :--- | :--- | | **Type** | 8536 | Non-reversing magnetic motor starter | | **Size** | S (NEMA Size 3) | Rated for heavy-duty industrial loads | | **Form/Enclosure** | HO | Open type (no external box/enclosure) | | **Voltage Code** | V03 | 240V AC, 60Hz / 220V AC, 50Hz coil | | **Overload Relay** | H30 | Thermal melting alloy overload protection | | **Phase** | 3-Phase | Designed for three-phase AC motors | | **Current Rating** | 90 Amperes | Maximum continuous current capacity | --- ### 2. Key Electronic & Mechanical Parts The device consists of three main sub-assemblies that work together to control and protect the motor: #### A. The Contactor (Main Body) The core switching mechanism. It uses an electromagnetic coil to pull in a set of heavy-duty power contacts. * **Stationary & Movable Contacts:** Silver-cadmium oxide points designed to withstand high-inrush currents without welding shut. * **Arc Chutes:** Structures that surround the contacts to dissipate the electrical arc created when the motor is turned off. #### B. The Magnetic Coil (V03) This is the "brain" of the switch. When 240V AC is applied to the coil terminals (A1/A2), it creates a magnetic field that closes the main power contacts. * **Voltage:** 240V AC @ 60Hz. * **Inrush/Sealed VA:** The power required to pull the magnet in is significantly higher than the power required to hold it closed. #### C. Thermal Overload Relay (H30) This part protects the motor from burning out due to over-current. * **Melting Alloy Type:** Uses "Heater Elements" (purchased separately based on motor FLA). * **Mechanism:** If the current stays too high for too long, the heat melts a specialized solder inside the relay, tripping a mechanical switch that cuts power to the coil, thus stopping the motor. --- ### 3. Wiring Configuration To operate this unit, the wiring is typically split into two circuits: 1. **Power Circuit:** L1, L2, L3 (Input) $\rightarrow$ T1, T2, T3 (Output to Motor). 2. **Control Circuit:** A separate or tapped 240V line that runs through a "Start/Stop" station and the Overload NC (Normally Closed) contact to the coil. ---