The **QO2201200** is a specialized electrical component manufactured by **Square D (Schneider Electric)**. It is a "Combination Circuit Breaker" specifically designed for the QO load center family. Below is a breakdown of its technical specifications and electronic functions. ### 1. Technical Specifications The model number reveals specific details about its capacity and configuration: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Square D (Schneider Electric) | | **Product Series** | QO (Plug-on design) | | **Ampere Rating** | 20A (Individual circuits) | | **Voltage Rating** | 120/240V AC | | **Number of Poles** | 2-Pole (Single unit footprint) | | **Interrupt Rating** | 10 kA | --- ### 2. Core Electronic Components and Design The QO2201200 is a **Tandem (Space-Saver) Circuit Breaker**. It is designed to provide two independent 120V circuits while occupying the physical space of only one standard 1-inch breaker slot. #### Internal Mechanisms: * **Thermal Element (Bimetallic Strip):** Provides overload protection. If current exceeds 20A for a prolonged period, the strip heats up and bends, triggering the mechanical trip. * **Magnetic Element (Solenoid):** Provides short-circuit protection. In the event of a high-current spike, the magnetic field pulls a trip lever instantly. * **Plug-On Connector:** Uses the industry-standard Square D "QO" pressure-biting connection for high conductivity and low resistance to the bus bar. * **Visi-Trip Indicator:** A signature electronic/mechanical feature—a highly visible red flag appears in the window when the breaker has tripped, allowing for instant diagnostics. --- ### 3. Usage and Wiring Configuration Because this is a tandem breaker, it is used to expand the capacity of a crowded load center. * **Input:** It draws power from a single phase of the bus bar. * **Output:** It has two separate load lugs. * **Application:** It is typically used for two separate 120V general-purpose lighting or outlet circuits. > **Warning:** This breaker provides two 120V circuits on the *same phase*. It cannot be used to power a 240V appliance (like a dryer), as there is no potential difference between the two hot leads. --- ### 4. Compatibility Requirements Not all panels accept tandem breakers. The QO2201200 requires a panel designed for "Class CTL" (Circuit Total Limiting). * **Mounting:** It features the "plug-on" mounting system. * **Slot Type:** Look for a "notched" bus bar in your QO panel to confirm it can accept tandem breakers. ---