The Square D HOM120CAFI is a single-pole, plug-in combination arc fault circuit interrupter (CAFI) designed to provide enhanced protection against both parallel and series arc faults in 120V AC residential branch circuits. It features a 20A thermal-magnetic trip with long-time and instantaneous (LI) functions, housed within a compact 100A/HOM frame measuring 79.5 mm H x 25.4 mm W x 75.69 mm D and weighing 0.65 lb. This breaker is CSA Certified, HACR rated, and UL Listed for safety, with a 10kA interrupting rating at 120V and screw clamp terminals accepting 14 to 8 AWG aluminum or copper wire. It is engineered for installation in Homeline load centers to protect circuits in living areas where arc fault protection is mandated by the National Electrical Code.