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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
Wiki User
∙ 16y ago
Wiki User
∙ 6y agorefer fault level calculation method to understand as to how KA rating of a device is defined
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What is the standard to select circuit breaker?
Add up your amps to calculate your breaker size. Add up your loads (amps), divide by 0.8, and choose that size breaker. If that number does not correspond to a standard size breaker you go to the next higher standard size breaker.
What does the ka rating of a circuit breaker mean?
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.
What is the Breaker size for 130 KW 3 Phase Chip collector fan working on 380 V?
Calculate the ampereage at .8 pf and take a breaker of 150% of ampere nd set the over current protection at 125% of full load current.
How do you calculate breaker capacity of 10 hp three phase induction motor?
The first thing you have to do is find the full load amps of the motor. The wire size feeding the motor has to be 125% of the full load current. The breaker is usually 250% of the full load current. If the voltage and amperage had been added to the question the exact breaker size could have been calculated.
What is circuit breaker handling trolley?
handling the circuit breaker
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.
How can calculate ka rating?
.
How do you calculate selectivity factor?
a = KB/KA
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 size breaker do you need for 3kva?
To calculate an answer a voltage must be stated.
How do you calculate rated kva of a circuit breaker?
You don't calculate the rated kV.A of a circuit breaker; it's determined by the manufacturer. It's important that a circuit breaker's rated kV.A exceeds the fault level kV.A at the point where the circuit breaker is located, otherwise it may fail to interrupt a fault current and, possibly, self destruct.
How we calculate the ka from the original equation?
[products] over [reactants]
What is method is used to calculate weight?
p=ka^3
What is the standard to select circuit breaker?
Add up your amps to calculate your breaker size. Add up your loads (amps), divide by 0.8, and choose that size breaker. If that number does not correspond to a standard size breaker you go to the next higher standard size breaker.
How do calculate CG line of any equal angle?
how do calculate cg line and hole details
How do you calculate the dc circuit breaker rating for a given kw?
the given kw Divide by the your voltage
What does the ka rating of a circuit breaker mean?
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.
