THE BEST VIRTUAL EXPO FOR INDUSTRIAL AUTOMATION PRODUCTS Introduction to : Circuit breakers
Aug 07, 2015
THE BEST VIRTUAL EXPO FOR INDUSTRIAL AUTOMATION PRODUCTS
Introduction to :
Circuit breakers
Circuit breakers
A circuit breaker is an automatically
operated electrical switch designed to protect an electrical
circuit from damage caused by overload or short circuit. Its
basic function is to detect a fault condition and interrupt
current flow. Unlike a fuse, which operates once and then
must be replaced, a circuit breaker can be reset (either
manually or automatically) to resume normal operation.
Miniature circuit breakers Molded case circuits brakers
Motor protective circuit breakers Vacuum
Thermal circuit-breakers High voltage
Medium voltage Air
Outdoor Residual current
M i n i a t u r e c i r c u i t b r e a k e r s
Miniature circuit breakers are types of low-
voltage circuit breakers that are designed to
protect an electric circuit in cases of overloads
that are more than 100A or in cases of short
circuiting of electric current.
These types of electric circuit breakers use either
thermal or thermal- magnetic based operations.
M o l d e d c a s e c i r c u i t
b r e a k e r s
Molded case circuit breakers are types of
protective electrical switches with a rating
electrical current of up to 2,500A. Molded
case circuit breakers normally use thermal or
thermal magnetic operation elements to open
or close electrical circuits protecting
machinery from potential damage.
These types of electrical circuit breakers are
used to a larger extent in control panels,
switchboards, motor control centers and
individual enclosures.
M o t o r p r o t e c t i v e c i r c u i t
b r e a k e r s
Motor protective circuit breakers are electrical
switches whose main purpose is to protect
circuits found in electric motor related
machinery. These types of protective electrical
switches are normally a combination protection
unit that may have functions like that of a switch,
over load relay or those of short circuit
protective devices.
To achieve complete protection and eliminate any
form of malfunction, motor protective circuit
breakers are used with a contractor hence
achieving complete motor protection.
Va c u u m c i r c u i t b r e a k e r s
Vacuum circuit breakers are electrical safety
devices that has two electrical contacts enclosed
in a vacuum.
One of the contacts is fixed to a specific position
while the other is free to move from one point to
another hence in case the vacuum circuit breaker
senses potential danger, the movable contact
pulls away from the fixed contact creating a
vacuum hence breaking the circuit.
Thermal circuit-breaker
This are electrical safety devices that have the ability to break a given circuit through switching it off automatically if the temperature rises above the normal one that it is supposed to work within.
Thermal circuit breakers are also known as commercial circuit breakers or circuit protectors in various electrical or manufacturing industries.
High voltage circuit breakers
High voltage circuit breakers are mechanical
switching safety electrical devices that mainly
connect and break current circuits and are used
to carry the nominal current in closed positions
from one point to another.
These types of circuit breakers are mainly used
in power transmission applications and are
relatively expensive as compared to other types
of circuit breakers.
Medium-voltage circuit breakers
Medium-voltage circuit breakers are safety devices that mainly use current sensing protective relays to decide on the most appropriate action opening electrical circuits to prevent damage of machinery or electrical equipment Medium- voltage circuit breakers are normally rated between 1 and 72kV.
These are the second in terms of handling current following high voltage circuit breakers. These types of circuit breakers may be either assembled into switch gear line ups to be used in indoors applications or installed outdoors in various substations as individual components.
Air circuit breakers
Air circuit breakers are electrical safety devices that usually operate in air at a given atmospheric pressure. Air circuit breakers are rated up to a maximum of 10,000A in the electrical field. Air circuit breakers can be categorized into either plain air circuit breakers or air blast circuit breakers. Air blast circuit breakers are used for the system voltage of of 245 KV and 420 KV where faster breaker operation is required to prevent current flow when hazardous situations arise.
Outdoor circuit breakers
Outdoor circuit breakers are types of electrical
safety devices that are mainly used to protect
electrical circuits from high voltage or voltage
fluctuations in outdoor applications. They can be
identified as either live tank or dead tank outdoor
circuit breakers according to their physical
structural design. The main difference between
the circuit breakers is that the switching device
surrounded at potential ground in dead tank
circuit breakers is at ground potential while that
of a live tank is at a potential above ground.
Residual current circuit
breakers
Residual current circuit breakers are also known as residual current devices. These are electrical wiring safety devices that disconnects circuits in cases involving electrical current imbalance between the energized line conductors and the neutral conductors This ensures protection against earth- leakage that may exist on electric circuits protecting people and electric against direct or indirect contact.
VALVES
Contact details : VISUM Ltd. Letna 40 040 01 Kosice Slovakia - E.U.
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