Golf 7 предохранители additional guidance please view our Fuse Technology Reference Guide or contact the Littelfuse products golf 7 предохранители in your area:. Also known as interrupting rating or short circuit rating, this is the maximum approved current which the fuse can safely break at rated voltage. Please refer to the golf 7 предохранители rating definition of this section for additional information.
The nominal amperage value of the fuse. Catalog Fuse part numbers include series identification and amperage ratings. Some common variations of these standards include: fully enclosed fuseholders, high contact resistances, air movement, transient spikes, and changes in connecting cablesize diameter and length.
Fuses are essentially temperature-sensitive devices. The circuit design engineer should clearly understand that the purpose of these controlled test conditions is to enable fuse manufacturers to maintain unified performance standards for their products, and he must account for the variable conditions of his application. The fuse temperature generated by the current passing through the fuse increases or decreases with ambient temperature change. The fuses in this catalog range in size from the approx.
As new products were developed throughout the years, fuse sizes evolved to fill the various electrical circuit protection needs. ByUnderwriters Laboratories had established size and rating specifications to meet safety standards. The renewable type fuses and automotive fuses appeared inand in Littelfuse started making very low amperage fuses for the budding electronics industry. Other non-glass fuse sizes and constructions were determined by functional requirements, but they still retained the length or diameter dimensions of the glass fuses.
Their designation was modified to AB golf 7 предохранители place of AG, indicating that the outer golf 7 предохранители was constructed from Bakelite, fibre, ceramic, or a similar material other than glass.
An important part of developing quality overcurrent protection is an understanding of system needs and overcurrent protective device fundamentals. This section discusses these topics with special attention to the application of fuses. All electrical systems eventually experience overcurrents. Unless removed in time, golf 7 предохранители moderate overcurrents quickly overheat system components, damaging insulation, conductors, and equipment. Large overcurrents may melt conductors and vaporize insulation.
Very high currents produce magnetic forces that bend and twist bus bars. These high currents can pull cables from their terminals and crack insulators and spacers. Too frequently, fires, explosions, poisonous fumes and panic accompany uncontrolled overcurrents. This not only damages electrical systems and equipment, but may cause injury or death to personnel nearby. Industry and governmental organizations have developed performance standards for overcurrent devices and testing procedures that show compliance with the standards and with the NEC.
Electrical systems must meet applicable code requirements including those for overcurrent protection before electric utilities are allowed to provide electric power to a facility.
An overcurrent is any current that exceeds the ampere rating of conductors, equipment, or devices under conditions of use. The golf 7 предохранители "overcurrent" includes both overloads and golf 7 предохранители.
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An overload is an golf 7 предохранители confined to normal current paths in which there is no insulation breakdown. Sustained overloads are commonly caused by installing excessive equipment such as additional lighting fixtures or too many motors.
Sustained overloads are also caused by overloading mechanical equipment and by equipment breakdown such as failed bearings.
If not disconnected within established time limits, sustained overloads eventually overheat circuit components causing thermal damage to insulation and other system components.
Overcurrent protective devices must disconnect circuits and equipment experiencing continuous or sustained overloads before overheating occurs. Temporary overloads occur frequently. Common causes include temporary equipment overloads such as a machine tool taking too deep of a cut, or simply the starting of an inductive load such as a motor. Golf 7 предохранители temporary overloads are by definition harmless, overcurrent protective devices should not golf 7 предохранители or clear the circuit.
It is important to realize that fuses selected must have sufficient time-delay to allow motors to start golf 7 предохранители temporary overloads to subside. However, should the overcurrent continue, fuses must golf 7 предохранители open before system components are damaged.
A short-circuit is an overcurrent flowing outside golf 7 предохранители its normal path. Types of short-circuits are generally divided into three categories: bolted faults, arcing faults, and ground faults. Each type of short-circuit is defined in the Terms and Definitions section.
A short-circuit is caused by an insulation breakdown or faulty connection. A typical electrical system might have a normal load impedance of 10 ohms. But in a single-phase situation, the same system might have a load impedance of 0.
If the same circuit has a 0. As stated, short-circuits are currents that flow outside of their normal path. Regardless of the magnitude of overcurrent, the golf 7 предохранители current must be removed quickly. If not removed promptly, the large currents associated with short-circuits may have three profound effects on an electrical system: heating, magnetic stress, and arcing.
Heating occurs in every part of an electrical system when current passes through the system.
When overcurrents are large enough, heating is golf 7 предохранители instantaneous. The energy in such overcurrents is measured in ampere-squared seconds I2t. An overcurrent of 10, amperes that lasts for 0. If the current could be reduced from 10, amperes to 1, amperes for the same period of time, the corresponding I2t would be reduced to 10, A2s, or just one percent of the original value.
If the current in a conductor increases 10 times, the I2t increases times. A current of only 7, amperes can melt a 8 AWG copper wire in 0. Within eight milliseconds 0. Any currents larger than this may immediately golf 7 предохранители organic insulations.
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Arcs at the point of fault or from mechanical switching such as automatic transfer switches or circuit breakers may ignite the vapors causing violent explosions and electrical flash.
Magnetic stress or force is a function of the peak current squared. Fault currents ofamperes can exert forces of more than 7, lb. Stresses of this magnitude golf 7 предохранители damage insulation, pull conductors from terminals, and stress equipment terminals sufficiently such that significant damage occurs.
Arcing at the point of fault melts and vaporizes all of the conductors and golf 7 предохранители involved in the golf 7 предохранители. Additional short-circuits are often created when vaporized material is deposited on insulators and other surfaces. Sustained arcing-faults vaporize organic insulation, and the vapors may explode or burn.
Since overcurrent protection is crucial to reliable electrical system operation and safety, overcurrent device selection and application should be carefully considered. When selecting fuses, the following parameters golf 7 предохранители considerations need to be evaluated:. The Class L fuses are the only time-delay fuse series available in these higher ampere ratings.
To select the proper overcurrent protective device for an electrical system, circuit and system designers should ask themselves the following questions before a system is designed:.
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Answers to these questions and other criteria will help to determine the type overcurrent protection device to use for optimum safety, reliability and performance. Littelfuse, Inc. We use cookies to collect information about how you interact with our website and to remember you.
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For example, these cookies remember your preference not to be tracked and identify trusted golf 7 предохранители traffic.
These cookies collect information about how visitors and users use our website, applications, and services. These cookies enable us to golf 7 предохранители our website, for instance, by ensuring that users are finding the required information. All information collected by these cookies is aggregated and anonymous. These cookies allow our website, applications and services to remember choices you make such as your golf 7 предохранители language and provide enhanced, more personal features.
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They remember that you have visited a website and this information is shared with other organizations such as advertisers. Products Automotive Sensors Golf 7 предохранители Sensors Littelfuse Automotive Sensor Products offer a wide range of sensors for use in golf 7 предохранители various vehicular functions in the areas of passenger safety, comfort and convenience plus vehicle powertrain, chassis and emission applications. Chassis Comfort and Convenience.
Fusing & Circuit Protection
Emissions Passenger Safety. Powertrain xEV Sensors. Littelfuse battery management devices provide methods of conserving battery power, protecting against over-discharge, combining and protecting auxiliary equipment such as liftgate motors. Littelfuse battery mini-Breakers provide battery cell protection for high-capacity Lithium Polymer and prismatic cells.
Metal Hybrid Protection. Electrical sockets, plugs and coils used golf 7 предохранители connection of a truck and trailer on commercial golf 7 предохранители or caravans for 12 and 24V systems. Connector Accessories Greycon Connectors. Common Mode Noise Filters CMF attenuate common mode noise in differential and balanced transmission, golf 7 предохранители power supply and audio lines. Littelfuse offers a comprehensive line of fuse blocks, fuse holders, and fuse accessories for automotive, electronic, and electrical markets.
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