Please take a minute to review and accept our Terms of Use.
Welcome to the PLECS User Forum, where you can ask questions and receive answers from other members of the community.

Many technical questions regarding PLECS are answered on the Technical Solutions page of our website. Tutorial videos, specific application examples, and pre-recorded webinars are available on our YouTube page. Please follow us on LinkedIn for the latest Plexim news.

What components can I use in the library?

0 votes
Please I want to use a fuse and electromechanical relay with my circuit. The circuit I am following is shown below , please what are the right components to select for the fuse and electromechanical relay as shown in the image below?
asked Nov 5, 2023 by Awesome (30 points)

1 Answer

0 votes


A basic fuse model could be implemented as a switch that is initially closed and opens when the current exceeds a certain threshold:


If the current is inductive you'll need to add a finite off-resistance (say, 1e6 ... 1e8 Ohms) in parallel with the switch, in order to avoid errors due to state inconsistencies.

You could also insert a Turn-on Delay between the Relational Operator and the Flip-flop so that the fuse will blow only if the current continuously exceeds the threshold for a certain amount of time.

The output of the flip flop could also directly close the M1/M2/M3 switches in synchronization with the fuse opening event.

answered Nov 17, 2023 by Kris Eberle (1,607 points)