The Airpax/Sensata 209 series hydraulic-magnetic circuit protectors offer a robust solution for branch circuit protection in various applications, including EDP, air conditioners, panel boards, and lighting controls. Utilizing the hydraulic-magnetic principle, these protectors adapt to local conditions, minimizing nuisance tripping caused by temperature variations. The inclusion of inertial delay for 50/60Hz units provides protection against inrush currents from transformers and lamps. Available in one to six pole assemblies with various terminal styles, the 209 series provides versatility for diverse industrial needs. Multi-pole protectors feature common-trip construction, ensuring all poles trip simultaneously in case of an overload.