Definition
A specialized electrical fuse used in aircraft generator field circuits that opens the circuit very rapidly when an overload or fault occurs. It is designed to break the field circuit faster than a standard fuse, preventing damaging voltage spikes and protecting the generator and connected equipment.
Plain English
A fuse that snaps open extra fast to protect the generator system the moment something goes wrong in the circuit.
Context Anchor
Seen in aircraft electrical system descriptions, wiring diagrams, maintenance manuals, and circuit protection discussions.
Derivation
The name comes straight from what it does: it 'breaks' the circuit 'quickly.' The 'quick' part is the key — ordinary fuses melt and open the circuit, but not fast enough for sensitive generator field circuits, where a slow break can let damaging voltage build up.
Why Pilots Care
Rapid fault clearing prevents electrical fires, protects expensive avionics, and maintains reliable power to critical flight instruments.
Analogy
It is like a weak link placed on purpose in a chain: if the pull becomes too strong, that link gives way first so the rest of the system is protected.
Intuition Check
Quick-break does not mean the fuse can be switched off and back on quickly. It means the fuse opens the circuit very fast when too much current flows, and after it opens it must be replaced.
Example Sentence 1
When the generator developed a fault, the quick-break fuse opened the field circuit before the voltage spike could damage the regulator.
Example Sentence 2
Technicians replaced the quick-break fuse after it cleared a momentary overload in the pitot heat system.