9
SIVACON S4 - ALPHA
Form
Main criteria
Subcriteria
Form 1
No internal separation
Form 2a
Separation of busbars from all functional units
Terminals not separated from busbars
Form 2b
Terminals separated from busbars
Form 3a
– Separation of busbars from all functional units
– Separation of all functional units from one another
– Separation of terminals for external conductors and the
external conductors from the functional units, but not from
the terminals of the functional units
Terminals not separated from busbars
Form 3b
Terminals for external conductors and external conductors
separated from busbars
Form 4a
– Separation of busbars from all functional units
– Separation of all functional units from one another
– Separation of terminals for external conductors associated
with a functional unit from the terminals of any other
functional unit and the busbars
– Separation of the external conductors from the busbars
– External conductors need not be separated from each other
Terminals in the same compartment as the associated
functional unit
Form 4b
Terminals not in the same compartment as the associated
functional unit
Standards
3
1
2
2
4
4
4
4
4
4
4
Unità funzionale
Functional unit
1 Sbarre principali
Main bus-bars
2 Sbarre di distribuzione
Bus-bars
3 Circuito d’ingresso
Input circuit
4 Circuito di uscita
Output circuit
Forma 1
Form 1
Forma 2a
Form 2a
Forma 2b
Form 2b
Forma 3a
Form 3a
Forma 3b
Form 3b
Forma 4b
Form 4b
Forma 4a
Form 4a
Terminale/i per
conduttori esterni
Terminal/s for external
conductors
3
1
2
2
4
4
4
4
4
4
4
3
1
2
2
4
4
4
4
4
4
4
3
1
2
2
4
4
4
4
4
4
4
3
1
2
2
4
4
4
4
4
4
4
3
1
2
2
4
4
4
4
4
4
4
3
1
2
2
4
4
4
4
4
4
4
Forms of internal separation (Tab. 104 CEI EN 61439-2)
ITA
ENG
