System overview
3.3 Connection methods
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
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Spring-loaded connection
Spring-loaded connection
All SIRIUS monitoring relays have spring-loaded connections. They make wiring quick and
maintenance-free, while also meeting high demands in terms of vibration and shock
resistance. If the cross-section of a connectable wire is greater than 6 mm², the forces
required for operation of the tension spring are so high that the spring-loaded connection can
no longer be used in a problem-free manner. For this reason, size S2 current monitoring
relays are only offered with screw-type or spring-loaded terminals in the control circuit. The
terminals of the main current paths are always screw-type terminals.
Finely stranded with end sleeve
Image 3-1 Spring-loaded terminal
The conductors can be clamped directly or you can pre-treat them to add a form of splice
protection. This could involve attaching end sleeves or pin cable lugs to the ends of the
conductors; the tidiest solution is to use conductors whose ends have been sealed by means
of ultrasound.
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