The AIRPAX/Sensata 209/219/229/249/279 series hydraulic magnetic circuit protectors offer a robust solution for branch circuit protection. These circuit breakers combine power switching with accurate and reliable protection in a compact, single or multi-pole unit. Utilizing the hydraulic-magnetic principle, they adapt to local applications and environments, minimizing nuisance tripping due to temperature variations. The design withstands high pulses without affecting normal delay curves, making them suitable for applications with ferroresonant transformers, lamps, and capacitive filters. Available in various configurations and terminal styles, these protectors cater to a wide range of industrial needs.