Bussmann FNQ-1 Fuse

The FNQ-1 fuse from Bussmann (Eaton) is a time-delay, cartridge fuse in the 5AG “midget” format, rated for 1 A at 500 V AC to handle brief startup surges without nuisance tripping. It measures 0.406 inches in diameter (10.3 mm) and 1.5 inches long (38.1 mm), with ferrule-end terminations and nickel-plated bronze endcaps for durable connections. This non-indicating FNQ-1 provides a 10 kA interrupting rating at 500 V, making it suitable for motor-control circuits, control transformers, and other applications where inrush currents are common. Typical uses include protection of power supplies and panel circuits in industrial or commercial equipment, where reliable time-delay protection helps maintain operation during transient overloads without compromising safety.