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A circuit breaker
- Unlike a fuse, which operates once and then has to be replaced
-- is an automatically-operated electrical
switch designed to protect an electrical circuit from damage
caused by overload or short circuit and can be reset..
Circuit breakers are made in varying sizes, from
small devices up to large switchgear designed to protect high
voltage circuits and ca be divided in:
Low voltage circuit breakers , Magnetic circuit breaker , Thermomagnetic circuit breaker
, Rated circuits ,
Medium-voltage circuit breakers , High-voltage circuit breakers, Sulfur Hexafluoride (SF6) high-voltage circuit-breakers
.
A transformer-- one of the most efficient electrical device --
is a machine that transfers electrical energy from
one circuit to another through inductively coupled electrical
conductors. A changing current in the first circuit (the
primary) creates a changing magnetic field inducing a changing
voltage in the second circuit
General Electric, Allen bradley,
Cutler, Hammer, Whestingouse, Zinsco, Square D & SiemensTransformers
come in a range of sizes from a thumbnail-sized to huge
units weighing hundreds of tons used to interconnect portions of
national power grids. |
