The 279-2-1REC4-53F-9-9-85 is a two-pole hydraulic magnetic circuit protector from the Airpax 279 Series, engineered for accurate and reliable circuit protection in compact single or multi-pole configurations. This unit combines power switching capabilities with magnetic circuit protection technology, making it suitable for branch circuit applications including EDP systems, air conditioners, panel boards, and lighting controls. The protector features a compact design with standardized dimensions of 2.750 inches (69.85 mm) width and 1.750 inches (44.45 mm) height, enabling flexible installation in various electrical enclosures. The two-pole configuration with REC4 terminal style and 53F frame size provides reliable protection for dual-circuit applications. These circuit protectors are ideal for industrial and commercial installations where dependable overcurrent protection and switching functionality are essential.