Square D NA/NC/NE/NX molded case circuit breakers provide thermal magnetic protection. Their primary function is automatic opening of a circuit under overload or short circuit conditions or manual opening. They are designed to meet residential, commercial, and industrial requirements to protect electrical systems, equipment, and people. This is a handle padlock attachment for NA/NC/NE/NX circuit breakers. This unit is a fixed lock ON or OFF for 2 or 3 pole NA/NC/NE/NX circuit breakers. This device is UL and CSA listed.