QO and QOB one, two, and three pole thermal magnetic circuit breakers provide overcurrent protection and switching on AC and DC systems. These circuit breakers have an over center, trip free toggle mechanism with quick make, quick break action and positive handle indication. A full line of factory installed accessories, such as shunt trips, auxiliary switches, and alarm switches, is also available. This attachment is a fixed attachment for padlocking a one pole QO circuit breaker in the OFF position only. It is applicable to one pole GF, AF, EPD, EPE, and AFGF circuit breakers.