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In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.
Britain pre-war had used a combination of 2A, 5A, and 15A round pin sockets. In an appendix to the main report (July 1944), the committee proposed that a completely new socket-outlet with a fuse in the plug to protect an appliance's flexible cord should be adopted as the "all-purpose" one socket and plug domestic standard.
Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks. Circuit breakers, relays, and fuses protect circuit wiring from damage caused by overcurrent.
15a from ballast resistor to coil and starter motor 16 15e battery+ from ignition switch, also when starter motor runs Preheat (Diesel engines) 15 preheat in + 17 start 19 preheat (glow) Starter; 45 starter relay 30f, 30h 45a starter 1 output 30h, 30h I 45b starter 2 output 30h II 50 starter control 50a starter control 50b starter control 50 50c
The BS 1363 plug has a fuse rated to protect its flexible cord from overload and consequent fire risk. Modern appliances may only be sold with a fuse of the appropriate size pre-installed. Modern appliances may only be sold with a fuse of the appropriate size pre-installed.
Safe operation relied on the neutral conductor in turn being connected to system ground at the circuit breaker or fuse box. If the neutral conductor were to break, disconnect, or develop high resistance, the appliance frame could become energized to dangerous voltages.
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