Description
2.6 Protection system
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
69
2.6
Protection system
This chapter contains an overview of the protection system of 3VA 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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