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LF Seismic vs. Standard Version: Key Differences and Applications

Understand the differences between LF seismic and standard electric relays, including the functions of masselotte and anti-pumping relay. Learn how seismic tests validate LF2-LF3 for NPP applications. Diagram comparison included.

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LF Seismic vs. Standard Version: Key Differences and Applications

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  1. Presentation : The major difference between LF seismic version and standard version concerns the opening and closing releases. There is an additional part called "masselotte" mounted on the standard coils. The function of this part is to bring a counterweight at the coil. If there are vibrations, metal rod of the coil does not move and keep its initial step. A seismic tests have allowed validating our LF2-LF3 in MCset cubicle (test report n°990878)

  2. Second difference is Anti-pumping Relay • On standard version of LF range there is an electronic anti-pumping relay KNE (see diagram). • On seismic version there is a OLD VERSION of anti-pumping relay - electromechanical relay KN (see diagram). • KN is confirmed for NPP application for EMC, also it allows to use closing coil circuit continuity supervision.

  3. KNE anti-pumping relay KNE

  4. KN anti-pumping relay KN

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