Plain English Meaning

Small safety parts that cut off electrical power if too much current flows, stopping wires and equipment from burning up. When one blows, you swap it for a new one of the same size.

Full Definition

Protective devices in an aircraft electrical system that contain a thin metal element designed to melt and break the circuit when current exceeds a safe level, preventing damage to wiring and equipment from overload or short circuits. Once a fuse blows, it must be replaced with a new one of the correct rating; it cannot be reset.

Context Anchor

Seen in aircraft electrical system discussions, maintenance checks, and cockpit troubleshooting when an electrical item stops working.