The Square D QOB240 is a 40 A Miniature Circuit Breaker designed for use in electrical systems with a voltage rating of 120/240 Vac. This circuit breaker is a 2-pole model from Square D, a well-known brand in electrical equipment. With a current rating between 31-40 A, the QOB240 is suitable for protecting circuits from overloads and short circuits in various industrial and commercial settings.