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Circuit Breakers __________________________________________________________________________ The most common use for
circuit breakers is in loadcenters and panelboards. They can be either the plug-in or bolt-on type. Loadcenters use plug-in
breakers. Panelboards use bolt-on breakers that bolt directly to the panelboard bus and to the panel frame for support. The
vast majority of our jobs use bolt-on. Most well-engineered jobs require bolt-on breakers. Use bolt-on for high A.I.C. interrupting
capacities. Circuit breakers are available
with more than one pole. A single handle opens and closes contact between two or more conductors. But single-pole breakers
can be ganged to protect each line. When that's done, the operating handles for all poles on a circuit should be tied together
with a bar device. Usually these breakers are made from single-pole breakers riveted together to form a two- or three-pole
device. Circuit breakers can be
either thermal, magnetic or a combination of the two. Thermal breakers react to changes in temperature, opening the circuit
in response to extra heat from a short. Magnetic breakers react to changes in current flow. A sudden increase in current flow
creates enough magnetic force to activate an armature, opening the circuit.
Thermal-magnetic breakers combine the best features of both types
of breakers and are the type commonly used in panelboards and loadcenters. Magnetic breakers are generally used in special
applications where the breaker must be unaffected by air temperature
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PARKO HOME RENOVATIONS,
Phone: (734) 812-3884
43812 Leeann Lane Canton, Michigan 48187 Written "By
Ron Parko" Author
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