10 • Recommended Wiring Schemes
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4.2.1
Short Circuit Protection
For “class 2 coordination”, protect the starter against a short circuit by thyristor protection fuses for I²t and
fuses as in dictated in the following table:
RVS-AX type
I²t (A²S)
Ferraz Fuses
RVS-AX 8
400
6,6 URS 35
RVS-AX 17
2,000
6,6 URS 45
RVS-AX 31
3,000
6,6 URS 63
RVS-AX 44
6,000
6,6 URB 100
RVS-AX 58
12,000
6,6 URB 150
RVS-AX 72
18,000
6,6 URB 160
RVS-AX 85
40,000
6,6 URD 200
RVS-AX 105
60,000
6,6 URD 250
RVS-AX 145
100,000
6,6 URD 355
RVS-AX 170
140,000
6,6 URD 400
4.2.2
Transient Protection
Line transient voltages can cause a malfunction of the starter and damage to the thyristors. All RVS-AX
starters incorporate Metal Oxide Varistors (MOV) to protect from normal line voltage spikes.
When higher transients are expected, additional external protection should be used (consult factory).
