Our Brands

Welcome to the Schneider Electric Website

Welcome to our website.
		
How can we help you today?
What is Class 5 timing accuracy as described in the Sepam Operation manual?
Issue
User needs clarification of what Sepam class 5 timing accuracy is as a percentage

Product Line
Sepam series 20, 40, and 80

Environment
Accuracy specifications

Resolution
Class 5 accuracy is defined in the IEC 60255-151 standard. Class 5 accuracy is ±5%.

This 5% has factors to be considered referring to different parts of the IDMT curve. These factors are defined in part 5.2(Accuracy related to the operate time) table 1 IEC60255-151(2009). This table is provided below.

This table gives the factors for different ranges (Gs= threshold). To determine the real accuracy, multiply the assigned error of 5% by the limiting error from the above table. The assigned error is based on the accuracy class 5 for the Sepam relay. The real accuracy values for each of these ranges is below:
  • For current between 2 to 5, real accuracy would be 2.5*5% = 12.5%
  • For current between 5 to 10, real accuracy would be 1.5*5% = 7.5%
  • For current higher than 10*Gs or 10 times threshold, real accuracy would be 1*5% = 5%

Schneider Electric Ireland

What is Class 5 timing accuracy as described in the Sepam Operation manual?
Issue     
User needs clarification of what Sepam class 5 timing accuracy is as a percentage

Product Line    
Sepam series 20, 40, and 80

Environment   
Accuracy specifications

Resolution
Class 5 accuracy is defined in the IEC 60255-151 standard. Class 5 accuracy is ±5%. 

This 5% has factors to be considered referring to different parts of the IDMT curve. These factors are defined in part 5.2(Accuracy related to the operate time) table 1 IEC60255-151(2009). This table is provided below. 

This table gives the factors for different ranges (Gs= threshold). To determine the real accuracy, multiply the assigned error of 5% by the limiting error from the above table. The assigned error is based on the accuracy class 5 for the Sepam relay. The real accuracy values for each of these ranges is below:
  • For current between 2 to 5, real accuracy would be 2.5*5% = 12.5% 
  • For current between 5 to 10, real accuracy would be 1.5*5% = 7.5% 
  • For current higher than 10*Gs or 10 times threshold, real accuracy would be 1*5% = 5% 

Schneider Electric Ireland

Explore more
Range:
Explore more
Range:
Users group

Discuss this topic with experts

Visit our community and get advice from experts and peers on this topic and more
Users group

Discuss this topic with experts

Visit our community and get advice from experts and peers on this topic and more
Explore more
Range:
Explore more
Range:

Need help?

  • Where to buy?

    Easily find the nearest Schneider Electric distributor in your location.

  • Search FAQs

    Search topic-related frequently asked questions to find answers you need.

  • Contact Sales

    Start your sales enquiry online and an expert will connect with you.

  • All Support & Contact

    Find answers now. Search for a solution on your own, or connect with one of our experts.

I'd like to receive news and commercial info from Schneider Electric and its affiliates via electronic communication means such as email, and I agree to the collection of information on the opening and clicks on these emails (using invisible pixels in the images), to measure performance of our communications and improve them. For more details, please read our Privacy Policy.

  • Products Documentation
  • Software Downloads
  • Product Selector
  • Product Substitution and Replacement
  • Help and Contact Centre
  • Find our Offices
  • Where to buy
  • Careers
  • Company Profile
  • Report a misconduct
  • Accessibility
  • Newsroom
  • Investors
  • EcoStruxure
  • Job Search
  • Blog
  • Privacy Policy
  • Cookie Notice
  • Terms of use
  • Change your cookie settings
Your browser is out of date and has known security issues.

It also may not display all features of this website or other websites.

Please upgrade your browser to access all of the features of this website.

Latest version for Google Chrome, Mozilla Firefox or Microsoft Edgeis recommended for optimal functionality.