Effect of frequency on Circuit Breaker Rating?

Status
Not open for further replies.
P

pablo r. reyes

Member
May I know from someone what is the effect of frequency rating on circuit breaker? In my understanding, it is good if rated 60Hz CB be used in 50Hz system frequency, but it's getting worst if a 50Hz CB be used on 60Hz system frequency. Is there something to do with heating effect, interrupting capacity and continuous ampere rating of CB?


Pabs
 
Re: Effect of frequency on Circuit Breaker Rating?

TUFF QUESTION, I DON'T KNOW THE ANSWER ,BUT WILL SEND IT TO MY BREAKER REPS FOR THERE TECH PEOPLE.WILL GET BACK TO YOU WHEN I GET AN ANSWER.
 
Re: Effect of frequency on Circuit Breaker Rating?

Jeff: Please turn off the ALL CAPS feature. It makes the post more difficult to read. It is also considered impolite, as though you were SHOUTING at us.
 
Re: Effect of frequency on Circuit Breaker Rating?

We have found that 50 or 60hz have almost the same heating effect and IC rating so all of our breakers can be used on both frequencies, even our electronic breakers. This is what Cuttler hammer sent back to me.
 
Re: Effect of frequency on Circuit Breaker Rating?

This is what SQ D sent back to me.

Circuit breaker performance is essentially the same at 50 and 60 Hz. Heating effects due to AC
frequency only come into effect when the frequency is significantly higher. The most common
frequency other than 50 and 60 Hz is 400 Hz. Rerating a circuit breaker (not loading the
breaker as heavily) is required when used on AC system voltages above 60 Hz. UL Listed
Thermal-Magnetic circuit breakers are typically rated 50/60 Hz. Some electronic control type
circuit breakers are UL Listed only at 60 Hz , due to the sampling rate of the electronic
control unit.
 
Status
Not open for further replies.
Top