The Challenger C240 is a 40-Amp, 2-pole miniature circuit breaker designed for 120/240V systems, typically used to protect heavy residential/commercial loads like air conditioners and water heaters. It features a Type C trip curve, 10kAIC interrupting rating, and a plug-in mount.

The Challenger brand was acquired by Eaton, making modern Eaton Type BR breakers direct-fit replacements.