Protection & Safety
Fuses, breakers, TVS — keeping circuits alive
Fuse (glass/blade/SMD/thermal)
Fuse
A deliberate weak link that melts and breaks the circuit when current exceeds a safe level, protecting wiring and devices from fire and damage. One-shot (or resettable).
Resettable Fuse (PTC / Polyfuse)
Fuse
A thermally-sensitive resistor that increases resistance dramatically when overheated, acting as a self-resetting circuit breaker.
MCB (Miniature Circuit Breaker)
Breaker
A resettable mains circuit breaker that trips on overload or short circuit, protecting house/building wiring. Replaces rewireable fuses; just switch it back on after a trip.
RCCB / RCD / GFCI
Breaker
A device that quickly cuts power when it detects leakage current to ground, protecting against electric shock and fire hazards.
MCCB
Breaker
A moulded-case circuit breaker: the industrial big brother of the MCB. Handles 100–1600 A frames, adjustable trip settings, and can interrupt very large fault currents in panels and machine feeders.