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Most times it is the surge current the breaker can withstand in kilo-amps. A normal breaker will see several thousand amps in a short condition. The breaker must be able to withstand and break that current safely.
Wiki User
∙ 16y ago
Wiki User
∙ 10y agoKillo Amp interrupting capacity.
Eg.:
14KAIC this meas that your CB is capable to handle 14 kiloampered fault current with out damaging your circuit breaker..
Killo Amp interrupting capacity
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What is the Electrical circuit breaker making and making capacity?
making current is a peak value attain at first cycle when the circuit breaker is close.the making current rating is expressed in "peak" value of the maximum ac current it can safely close on that's why it is always have higher value than breaking current. Making current is limited by the withstand capability of the contacts. Breaking current is based on the ability of the contacts to interrupt the current. If the contacts are not able to interrupt the current when they open, the heat energy in the resulting arc will often destroy the device. the breaking current rating is expressed in RMS value of the current.
What is difference between vacuum circuit breaker and vacuum contactor?
First thing, there is nothing like vacuum circuit contactor. It is a vacuum contactor. It has hrc fuse for protection against short circuit and have vacuum bottles in which contacts move to get close and open. It will never trip bcas it does not have tripping mechanism, it does not have operating mechanism. It's contacts are made only to make and break normal current. It is used to start and stop a motor only. It does not have ka rating for fault current. Vacuum circuit breaker is a real fault current breaker which trips during a fault like short circuit, earth fault, under or over voltage or any one. It encompasses the operating mechanism to break the contacts at a very high speed and also need a spring charging mechanism to turn the breaker on. It has very highly rated contacts inside a heavy capacity vacuum bottles. It has realese ( something like solenoid ) which pulls the plunger after it get signals from various protection relays in case of fault. It is not meant to operate for day to day start and stop operation of motor. It has ka rating for fault current. Analogus to ordinary home circuit, vcb is like a circuit breaker at home inside a panel and vc is a relay in our any of instruments at home. Analogus to low voltage situation, vcb is like a fault current ( air, or bulk oil or minimum oil ) circut breaker and vc is like an ordinary contactor
What is the 'short circuit capacity' of a 32A 60898 MCB?
Depends on manufacturer..Normally the ratings are as follows 1. Service short circuit breaking capacity is 7.5 kA 2. Rated short circuit breaking capacity is 10 kA.
How do you calculate kA for breaker?
It has been some time but here goes. The circuit breaker size can be found when some other information is given. For a given voltage value, the size of the cb is basically found using the formula P(Kw) = IV here the value of I is approx the value of the circuit breaker. The solution is not so simple since there are normally tolerances set by the different regulator organisations as to these values. Another situation to consider is the type of current and voltage you are using ie ac or dc, Vac or Vdc. also the amount of phases if it is ac voltages we are considering . If 3 phase ac voltage and current the formula used is as follows P(kva) = 1.73 x IL x VL x pf where pf , the power factor is the introduced and kva the apparent power is used instead of kw here because under most conditions a power factor of 1 cannot be achieved. IL and VL are the line current and voltage. Gladstone
What does Ka mean on a radar?
It is a carrier Frequency Band between 26.5GHz and 40GHz
Can all circuit breakers interrupt large fault currents?
All Circuit Breakers have a current rating and a FAULT current rating. The current rating refers to the current at which the circuit breaker is designed to 'break' the circuit and this is generally shown in Amperes (A). FAULT current rating is generally alot higher rating and is therefor shown in kilo Amperes (kA). This kA rating refers to the amount of current which a circuit breaker is designed to handle under fault conditions and can still maintain operation and 'break' contact. Most household circuit breakers are around 7.5 kA, so any fault over 7,500 Amperes could potentially damage the circuit breaker contacts to the point which it can not open the circuit. Larger fault ratings are found in larger applications such as MCC's on plants, minesites or power stations.
What does the KAIC rating mean on a circuit breaker?
kAIC means the maixum current interruption capacity of circuit braker. IC stands for interruption capcaity. So if a CB has 10 kAIC means it can cut off current of up to 10 kA without damaging itself.
What is KA in Circuit Breaker?
KA stands for kilo-amps, or thousands of amps. Thus a 2KA breaker means it will trip when the load exceeds 2,000 amps.
What is fault mva rating of circuit breaker?
Pre 1970 (72?) breakers were specified with a MVA assymmetrical interrupting rating. Breakers are now spec'd with a symmetrical rating, which is provided in amps or kA. There is an ANSI standard that provides conversion from assymetrical to symmetrical and vice versa. Converting from Asym. to symmetrical involves analyzing the open close interval, time between successive openings, breaker operating speed, breaker operating voltage, and whether the breaker is connected to a generator bus or not (usually has an unusually high X/R ratio which results in more DC offset). So...it is the interrupting rating, or how much (short circuit) power the breaker can interrupt. The faster the breaker operates, the higher the voltage, the closer it is to a generator, and the more times it is expected to open results in a lower interrupting amperage capability. If it is used beyond this rating, it is likely to internally fault when attempting to open.
What is ics icu icw of load breaker?
Ics: Service breaking capacity for a short circuit (in kA)Icu: Ultimate breaking capacity (in kA)Icw: Withstand capacity (usually in kA for 1 sec)
What circuit breaker rating is commonly used for a radial circuit?
In the terms of voltage it should be in kV but when we are using the current term than it should be in kiloamperes or kA because the short circuit current level of the circuit breaker is very high.AnswerIt depends entirely on the voltage level and load currents you are talking about. It will be completely different for, say, a 132-kV system than for, say, a 230 V system. So, does your question apply to high-voltage systems or low-voltage systems?
What is the Electrical circuit breaker making and making capacity?
making current is a peak value attain at first cycle when the circuit breaker is close.the making current rating is expressed in "peak" value of the maximum ac current it can safely close on that's why it is always have higher value than breaking current. Making current is limited by the withstand capability of the contacts. Breaking current is based on the ability of the contacts to interrupt the current. If the contacts are not able to interrupt the current when they open, the heat energy in the resulting arc will often destroy the device. the breaking current rating is expressed in RMS value of the current.
How can calculate ka rating?
.
What is difference between vacuum circuit breaker and vacuum contactor?
First thing, there is nothing like vacuum circuit contactor. It is a vacuum contactor. It has hrc fuse for protection against short circuit and have vacuum bottles in which contacts move to get close and open. It will never trip bcas it does not have tripping mechanism, it does not have operating mechanism. It's contacts are made only to make and break normal current. It is used to start and stop a motor only. It does not have ka rating for fault current. Vacuum circuit breaker is a real fault current breaker which trips during a fault like short circuit, earth fault, under or over voltage or any one. It encompasses the operating mechanism to break the contacts at a very high speed and also need a spring charging mechanism to turn the breaker on. It has very highly rated contacts inside a heavy capacity vacuum bottles. It has realese ( something like solenoid ) which pulls the plunger after it get signals from various protection relays in case of fault. It is not meant to operate for day to day start and stop operation of motor. It has ka rating for fault current. Analogus to ordinary home circuit, vcb is like a circuit breaker at home inside a panel and vc is a relay in our any of instruments at home. Analogus to low voltage situation, vcb is like a fault current ( air, or bulk oil or minimum oil ) circut breaker and vc is like an ordinary contactor
How the ka rating of mccb is calculated?
ka of mccb=transformer(KVA)x100/1.732xsecondary voltagex%impedence of transformer
What happened to the video game rating KA?
It was replaced by "Everyone" in 1998.
What is the difference between the rupturing capacity and the short circuit breaking capacity?
Rupturing capacity:Rupturing capacity or breaking capacity expresses the current that a circuit breaker is capable of breaking at a given recovery voltage under certain set conditions of operation. It is expressed in MVA The set conditions are power factor,recovery voltage and rate of rise of restriking voltage. When the current broken is symmetrical it is called symmetrical breaking capacity. When the current broken is asymmetrical it is called asymmetrical breaking capacity. It is common to designate circuit breaker capacity based on asymmetrical breaking capacity. Breaking capacity of a circuit breaker =√3xVxIx10-6MVA Short circuit breaking capacity: It is the highest value of short circuit current which a circuit breaker is capable of breaking under specified conditions of transient recovery voltage and power frequency voltage. It is expressed in kA. The breaking current is expressed in two ways1)The r.m.s value of a.c component of current at the instant of contact separtation.2)The percentage of d.c component of current at the instant of contact separtation. While selecting the circuit breaker for a particular location in the power system the fault level at that point is determined.
