IUGN6-1-59-40.0 is a single-pole hydraulic magnetic circuit protector from the Airpax IAG/IUG series designed for reliable circuit protection and power switching in international applications. This unit features a delay 59 characteristic, which provides instantaneous trip response with maximum trip times of 0.120 seconds at 125% rated current, 0.100 seconds at 150% rated current, and 0.050 seconds at 200% rated current, making it suitable for protecting sensitive electronic equipment. The protector is rated for 40.0 amperes and operates at 250V AC (50/60 Hz) with a short circuit rating of 2000 amperes per UL1077 and CSA standards. It is available with standard single-pole mounting configuration and includes a manual ON/OFF toggle handle. This device is commonly used in automation systems, sensitive circuitry applications, and equipment requiring fast-acting protection without intentional delay.