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2. Fuse (electrical) - Wikipedia

   en.wikipedia.org/wiki/Fuse_(electrical)

   Some fuses allow a special purpose micro switch or relay unit to be fixed to the fuse body. When the fuse element blows, the indicating pin extends to activate the micro switch or relay, which, in turn, triggers an event. Some fuses for medium-voltage applications use two or three separate barrels and two or three fuse elements in parallel.

3. Resettable fuse - Wikipedia

   en.wikipedia.org/wiki/Resettable_fuse

   A resettable fuse or polymeric positive temperature coefficient device (PPTC) is a passive electronic component used to protect against overcurrent faults in electronic circuits. The device is also known as a multifuse or polyfuse or polyswitch .

4. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   High-power LEDs are packaged in large-area ceramic packages that attach to a metal heat sink using thermal grease or other material to conduct heat. If an LED lamp does not have free air circulation, the LED is likely to overheat, resulting in reduced life or early failure.