The CAFCI breaker effectively stops the flow of current before an electrical fire from dangerous arcing can start. Typical causes of dangerous arc faults in a residence are: cord insulation damage from furniture, drywall screw piercing insulation, punctured cable by nail or staple. A standard feature in all HomeLine CAFCI circuit breakers is the TIME SAVER diagnostics test that assists in identifying the type of fault that last occurred in a circuit. It saves money by reducing troubleshooting time, simple to use and requires no tools.