The AIRPAX/SENSATA 219-3-1-66-8-2-9 is a hydraulic magnetic circuit protector within the 209 series family. This circuit breaker combines power switching with accurate and reliable circuit protection in a compact, single or multi-pole unit, making it ideal for branch circuit applications such as EDP, air conditioners, panel boards, and lighting controls. Utilizing the hydraulic-magnetic principle, the protector adapts to local applications and environments, minimizing nuisance tripping due to temperature variations. It is designed to withstand high pulses without affecting normal delay curves.