The Airpax/Sensata 209, E-Frame circuit breaker combines power switching with accurate, reliable circuit protection in a compact single or multipole unit. Ideal for branch circuit applications such as EDP, air conditioners, panel boards and lighting controls, this family of circuit breakers is available in various configurations and terminal styles to meet diverse application needs. Utilizing the hydraulic-magnetic principle, these protectors adapt to local environments, minimizing nuisance tripping due to temperature variations. They withstand high pulses without affecting normal delay curves, providing robust protection for a wide range of industrial applications.