The AIRPAX/Sensata 209, 219, 229, 249, and 279 series hydraulic magnetic circuit protectors combine power switching with accurate and reliable circuit protection. Utilizing the hydraulic-magnetic principle, these protectors adapt to local applications and environments, minimizing nuisance tripping due to temperature variations. They withstand high pulses without affecting normal delay curves and are suitable for various applications including EDP, air conditioners, panel boards, lighting controls, and power selector breaker systems. The multi-pole protectors feature common-trip construction, ensuring all poles trip simultaneously in case of an overload, and offer a wide range of configurations for versatile design engineering.