Description
2.5 Protection functions
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
63
This chapter provides an overview of the protection system of 3VA UL molded case circuit
breakers.
The topics discussed in this chapter are listed below:
● Description of functions
● Overload protection (L)
● Short-time delayed short-circuit protection (S)
● Instantaneous short-circuit protection (I)
● Ground-fault protection (G)
● Neutral conductor protection (N)
● ZSI - Zone Selective Interlocking
● Guide to setting the tripping characteristic
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