Electronic engineers and manufacturers
are realizing the increasing importance for "designing in" an
adequate margin of safety to protect against high energy, short term current
surges or voltage spikes. Likewise, protection also needs to be considered in
the final circuit design where there exists a potential for more frequent, but
less intense power surges.
These transient events, such as a
lightning strike, or in the case of electrical switching, can produce high
energy and result in significant heating within a circuit element, affecting
its performance, and possibly result in premature component failure, or
catastrophic damage to other components throughout the circuit. Repair or
replacement of circuit components not only has devastating financial consequences,
but causes significant downtime to be incurred. Therefore, use of pulse resistors
when designing a circuit should be considered.
Pulse resustors are specifically used in a circuit to literally "withstand" the excess load and heating that accompanies a transient energy event. Hence, they are typically known as Power Withstanding Resistors (PWRs). Fusing with flameproof protection, under specific fault conditions, can also be designed into the resistor performance where necessary. The types of resistor technologies available are wirewound, metal film, metal oxide, and surface mount. Telecommunications, computers, consumer electronics, and office equipment are just a few of the applications in which a pulse resistor may be used.
Guard Against Inrush Current
"Inrush current" is current in a circuit that is generated by the initial magnetizing of a transformer or by the initial capacitor charging. Although for only a short period of time, the circuit components are subjected to significantly higher current than normal, and over time, can result in damage or premature failure of the component. Use of a with fusing characteristics helps to extend the life of the circuitry by dissipating and limiting the adverse effects of inrush current to circuitry downstream.
Short Circuit Protection
A PWR is used to provide short circuit or overload protection. Overload protection can also be referred to as overcurrent protection. Today, current output in circuits is monitored electronically, where resistors are used to divert or limit that is allowed to be ultimately passed through the circuit. A series voltage regulator with constant current limiting capability is one example.
When selecting pulse resustors for use in a circuit, it is important to properly size the resistor to meet the desired performance requirements and determine which resistor technology best matches your application.
Pulse resustors are specifically used in a circuit to literally "withstand" the excess load and heating that accompanies a transient energy event. Hence, they are typically known as Power Withstanding Resistors (PWRs). Fusing with flameproof protection, under specific fault conditions, can also be designed into the resistor performance where necessary. The types of resistor technologies available are wirewound, metal film, metal oxide, and surface mount. Telecommunications, computers, consumer electronics, and office equipment are just a few of the applications in which a pulse resistor may be used.
Guard Against Inrush Current
"Inrush current" is current in a circuit that is generated by the initial magnetizing of a transformer or by the initial capacitor charging. Although for only a short period of time, the circuit components are subjected to significantly higher current than normal, and over time, can result in damage or premature failure of the component. Use of a with fusing characteristics helps to extend the life of the circuitry by dissipating and limiting the adverse effects of inrush current to circuitry downstream.
Short Circuit Protection
A PWR is used to provide short circuit or overload protection. Overload protection can also be referred to as overcurrent protection. Today, current output in circuits is monitored electronically, where resistors are used to divert or limit that is allowed to be ultimately passed through the circuit. A series voltage regulator with constant current limiting capability is one example.
When selecting pulse resustors for use in a circuit, it is important to properly size the resistor to meet the desired performance requirements and determine which resistor technology best matches your application.
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