Circuit-Breake Mitsubishi Model TCS-03SV3 Can Be Used To Distribute Electri

Circuit breaker refers to the switching device that can close, carry and
disconnect the current under normal circuit conditions, and can close, carry
and disconnect the current under abnormal circuit conditions within a specified
time. Circuit breakers are divided into high-voltage circuit breakers and low-
voltage circuit breakers according to their scope of use. The division of high-
voltage and low-voltage boundaries is relatively vague. Generally, those above
3KV are called high-voltage appliances.


The circuit breaker can be used to distribute electric energy, start the
asynchronous motor infrequently, and protect the power line and motor. When
they have serious overload, short circuit, undervoltage and other faults, it
can automatically cut off the circuit. Its function is equivalent to the
combination of fuse switch and over and under heating relay. Moreover, it is
generally not necessary to change the parts after breaking the fault current.
At present, it has been widely used.


Power distribution is an extremely important link in the generation,
transmission and use of electricity. The distribution system includes
transformers and various high and low voltage electrical equipment, and the low
voltage circuit breaker is an electrical appliance with large amount and wide
range of use.
working principle
The circuit breaker is generally composed of contact system, arc extinguishing
system, operating mechanism, release, shell, etc.


In case of short circuit, the magnetic field generated by large current
(generally 10 to 12 times) overcomes the reaction spring, the release pulls the
operating mechanism to act, and the switch trips instantaneously. In case of
overload, the current increases, the calorific value intensifies, and the
bimetallic sheet deforms to a certain extent to promote the action of the
mechanism (the greater the current, the shorter the action time).


For the electronic type, the transformer is used to collect the current of each
phase and compare it with the set value. When the current is abnormal, the
microprocessor sends a signal to make the electronic release drive the
operating mechanism.


The function of circuit breaker is to cut off and connect the load circuit and
cut off the fault circuit to prevent the expansion of accident and ensure safe
operation. The high-voltage circuit breaker needs to break the arc with 1500V
and current of 1500-2000a. These arcs can be elongated to 2M and still continue
to burn. Therefore, arc extinguishing is a problem that must be solved for high
voltage circuit breaker.


The principle of arc blowing and arc extinguishing is mainly to cool the arc
and reduce heat dissociation. On the other hand, arc blowing lengthens the arc
to strengthen the recombination and diffusion of charged particles, and blow
away the charged particles in the arc gap to quickly restore the insulation
strength of the medium.


Low voltage circuit breaker, also known as automatic air switch, can be used to
turn on and off load circuit, and can also be used to control infrequently
started motor. Its function is equivalent to the sum of some or all functions
of knife switch, overcurrent relay, voltage loss relay, thermal relay and
leakage protector. It is an important protective appliance in low-voltage
distribution network.


Low voltage circuit breaker has many protection functions (overload, short
circuit, undervoltage protection, etc.), adjustable action value, high breaking
capacity, convenient operation, safety and other advantages, so it is widely
used. Structure and working principle low voltage circuit breaker is composed
of operating mechanism, contact, protection device (various releases), arc
extinguishing system, etc.


The main contact of low-voltage circuit breaker is closed manually or
electrically. After the main contact is closed, the free tripping mechanism
locks the main contact in the closing position. The coil of the overcurrent
release and the thermal element of the thermal release are connected in series
with the main circuit, and the coil of the undervoltage release is connected in
parallel with the power supply. In case of short circuit or serious overload of
the circuit, the armature of the overcurrent release is pulled in to make the
free tripping mechanism act, and the main contact disconnects the main circuit.
When the circuit is overloaded, the thermal element of the thermal release
generates heat, which bends the bimetallic sheet and pushes the free release
mechanism to act. When the circuit is under voltage, the armature of the under
voltage release is released. It also makes the free tripping mechanism act. The
shunt release is used for remote control. During normal operation, its coil is
powered off. When distance control is required, press the start button to power
on the coil.