This Schneider Electric QOB21001021 is a 100-amp, 1-pole miniature circuit breaker rated for 120/240 volts. It's designed for residential or light commercial electrical panels, providing overcurrent protection for a single circuit. Schneider is a trusted brand in electrical gear, so you can expect reliable performance. It's compatible with certain load centers—always verify it matches your panel model before installation. The breaker is built to handle up to 600V, but typical home use is lower. If you're replacing a faulty breaker or adding a new circuit, this is a quality part. Remember, electrical work can be dangerous; if you're not experienced, hire a licensed electrician. But if you know what you're doing, this breaker is straightforward to install. A dependable component for keeping your electrical system safe.