The product is a used Square D Bolt On QOB3100 3 Pole 100 Amp Circuit Breaker. It is a miniature circuit breaker with an on/off operation method, suitable for electrical equipment and supplies. The circuit breaker has a maximum amperage of 100A and operates at a voltage of 120/240 Vac. With its bolt-on mounting style, it is designed for easy installation and maintenance in commercial or industrial settings. The Square D brand ensures reliability and quality in electrical systems.