This is a Ferraz Shawmut ATQR-1/2 time delay fuse - rated for 0.5 amps at 600 volts AC. The ATQR series are slow-blow fuses, meaning they can handle temporary overloads without blowing, but will protect against sustained faults. Brand is Ferraz Shawmut (now part of Mersen), a reputable name in electrical protection. Comes brand new in original packaging. These fuses are used in industrial controls, motor circuits, or any application where you need time-delay characteristics. The 1/2 amp rating is pretty low current, so it's for sensitive circuits. 600VAC rating means it can handle higher voltage systems safely. If you're replacing a blown fuse in equipment and it says ATQR-1/2 or ATQR 0.5A, this is the exact match. Using the correct time-delay fuse matters - fast-acting might nuisance trip on motor startups. No other specs listed, but it's the genuine article. Keep spares on hand for maintenance. Essential for electricians, plant maintenance, or anyone working with industrial controls. Simple component, but critical for safety and equipment protection.
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