IUG66-1-63-40.0-01 is a single-pole hydraulic magnetic circuit protector from the Airpax IAG/IUG/IEG/CEG/LEG series designed for low-cost power switching and accurate circuit control in international applications. This unit features a 50/60Hz motor start delay (type 63) with screw terminals, providing reliable protection for equipment requiring longer delay times to accommodate motor inrush currents and transformer/capacitor loads. The protector operates with a rated current of 40.0 amperes and includes a toggle handle for manual operation. With its compact single-pole design and proven hydraulic-magnetic technology, it is well-suited for motor protection, transformer circuits, and sensitive electronic equipment applications where controlled delay characteristics are essential for preventing nuisance trips.