×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

ATS short circuit rating

ATS short circuit rating

ATS short circuit rating

(OP)
Guys,
I have an ATS data sheet and wondering what is 100KA? Is this the current that ATS can stand (not interrupt) for no more than 0.05 second?

An investment in knowledge pays the best interest (Benjamin Franklin).
www.kookypedia.com

RE: ATS short circuit rating

Yes.

RE: ATS short circuit rating

This is a 3-cycle rated ATS per UL 1008. This unit is able to withstand a fault of 100 kA for 3-cycles (0.05 sec) and up to 42 kA for 18 cycles (0.3 sec)and not exceed certain damage criteria.
Should be noted that If circuit breaker is used, must have an instantaneous trip and clear as follow:
. ATS ≤ 400 A Continuous 1.5-cycles clearing time and tested for 10 kA.
. ATS > 400 A Continuous 3-cycles clearing time
When protected by current-limiting fuses, the ATS, regardless of manufacturer, amp size, and options used, have higher interrupting rating same as the fuse up to 200,000 A.

WARNINGS:
The ATS rated for 3 cycles (0.050 sec) are not suitable for mission critical or life safety systems such as heath care facilities where continuity of service is crucial. The NEC requires ATSs to be “listed for emergency system use”
Use circuit breakers with short time delay cannot be used for 3 cycle rated ATS.


RE: ATS short circuit rating

(OP)
So what is the interrupting current for this breaker?

An investment in knowledge pays the best interest (Benjamin Franklin).
www.kookypedia.com

RE: ATS short circuit rating

The ATS is not intended to interrupt fault currents. It is intended to be protected by a breaker that meets the limits stated on the rating plate.
The withstand rating as opposed to the interrupting rating is given in a previous post.

Bill
--------------------
"Why not the best?"
Jimmy Carter

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources