When it comes to circuit
protection, there are several types of devices that you can use. MCBs, Resettable
Fuses, TVS Diodes, and Chokes are just a few of these. Each of them has a
different function. In this article, we will look at some of the different
types of circuit protection and how they work. After reading this article, you
should be able to choose the best circuit protection system for your needs.
Resettable Fuses
Resettable Circuit Protection
fuses can be used in a wide range of applications. Their function is to protect
electronic equipment from damaging overcurrent, short-circuit, and
over-temperature conditions. They are also characterized by being
field-replaceable and cost-effective. Listed below are some of their most
common uses. Read on to learn more about their features and benefits. Whether
they're the best choice for your application depends on the voltage and current
required for your circuit.
Resettable fuses are generally
designed to operate at a temperature less than their maximum operating current.
When they're heated, their materials undergo a unique transformation, changing
from a crystalline to an amorphous phase. This change increases the impedance.
In this way, the material undergoes a circuit trip at the material's
transformation, protecting the load from an overcurrent event.
MCBs
MCBs are used in electrical
circuits for their short-circuit and overload protection. They are useful in
industrial applications such as IT systems. The trip at a specific rate,
typically 5 to 10 times the full load current. MCBs can be rated for different
types of loads, and their short-circuit and load current ratings must be
properly matched to the equipment they protect. The IET Wiring Regulations
provide detailed guidance on how to choose the correct MCB for your
application.
MCBs can be of two types: Type C
and Type D. Both types protect against short-circuits, and Type C and Type D
are designed to protect against high-inrush currents. Type D and Type K MCBs
are rated at up to 20 times the full-load current, but they are generally
slower. In some cases, Type K MCBs are better suited to protect cables without
increasing the risk of nuisance tripping.
TVS Diodes
To choose the best TVS Diode for
circuit protection, consider the following guidelines. To select the most
appropriate TVS, consider the electrical characteristics of the circuit. The
type of transient should also be considered. Voltage overshoots caused by a
lightning strike will be different from those induced by a change in load or a
non-perfect voltage relation. Temperature also plays a role in selecting the
best device. The power rating of TVS Diodes decreases with increased
temperature.
The breakdown voltage is the
maximum voltage that a TVS diode will allow to flow to the ground. It is the
voltage over which TVS Diodes will provide transient protection. The breakdown
voltage should be slightly higher than the reverse stand-off voltage. This
helps to ensure faster protection. To determine the breakdown voltage of your
TVS Diode, look for a graph indicating the maximum power dissipation versus
temperature (VBR).
Chokes
The function of a choke in a
circuit is to prevent high-frequency signals from getting into the circuit and
causing damage. It is also used in the design of automotive CAN buses, which
allow various devices to communicate without requiring a host computer. Chokes
are used in this type of circuit to prevent the peaks in current that occur at
the output of a variable frequency drive or servo motor due to pulse-width
modulation.
A choke can stop unwanted noise
from entering electronic circuits by acting as an inductor and raising the
impedance of the circuit. Chokes can be either common mode or ferrite. Chokes
in a circuit can also be used to filter electromagnetic interference. Chokes
are common in many different industries, including LCD panels, computers,
monitors, USB cables, and communication microcontrollers. It's important to
note that common-mode chokes are made to resist a wide range of frequencies.
When it comes to circuit protection, there are several types of devices that you can use. MCBs, Resettable Fuses, TVS Diodes, and Chokes.#circuitprotection #circuits #electronics #electroniccomponents pic.twitter.com/eTs9YmNMLv
— Joddie Marshall (@joddie_marshall) April 30, 2022
Thermal Switches
There are several types of
circuit protection with thermal switches. Some are compact, and some are
magnetic. Generally, compact switches are designed to protect magnetic fields.
They contain contacts of various materials, but the hardest is made of wolfram
alloy. The softer materials are made of silver, graphite, or a combination of
the two. Thermal magnetic switches are excellent options for circuit protection
in a variety of applications. When choosing a thermal-magnetic switch, make sure
to consider the quality.
A simple thermal-protection
circuit includes two temperature switches. The resistances set the thresholds.
These temperature switches connect to the inputs of a dual-input OR gate. If
there are multiple hot spots, more temperature sensors can be added. The OR
gate will then crowbar the power supply or blow a fuse if the temperature
exceeds a predetermined limit. It may be necessary to install several
temperature sensors to protect multiple hot spots.
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