The Airpax/Sensata 209 series hydraulic magnetic circuit protectors combine power switching with accurate and reliable circuit protection in a compact, single or multi-pole unit. Designed for branch circuit applications like EDP, air conditioners, panel boards, and lighting controls, these protectors utilize the hydraulic-magnetic principle to adapt to various environments. They withstand high pulses without tripping and offer standard inertial delay for 50/60Hz units, minimizing nuisance tripping. Available in configurations with screw terminals, stud connectors, or solderless connectors, and with front or back-connected terminal styles, the 209 series provides versatility for diverse industrial applications.