×
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

630 Amp contactor with SIL 2 trip classification

630 Amp contactor with SIL 2 trip classification

630 Amp contactor with SIL 2 trip classification

(OP)
I have a classified trip request signal from the emergency shutdown system to trip the main contactor in the thyristor control panel for a heater (435kW). The contactor has to be classified to SIL 2 according to IEC 61508, which means it must not fail to trip more than once in 1000 requests to trip (as a worst case).

Is there an off-the-shelf contactor with this classification, rated 400V (50 Hz)630 Amps? There are only four of these in this application and local suppliers are not prepared to go through the certification process for such a few.

Do you think using a contactor with utilisation category AC-4 (according to IEC 947-4) would be a justifiable solution?

Your help will be appreciated.

lembede

RE: 630 Amp contactor with SIL 2 trip classification

(OP)
Thank you very much jbartos. Very useful info. indeed.

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