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:
Notes:
1. The above table is for maximum starting current of 400% of FLC, maximum starting time of 5
sec and rated voltage of 400 V.
2. Rating may change with different external conditions such as ambient temperature, forced
cooling etc. Refer to fuse manufacturer catalogs to confirm correct values.
4.2.2
Transient Protection
Line transient voltages can cause a malfunction of the starter and damage to the thyristors. All Solstart Plus
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).
Solstart Plus
Model
Max. thyristor I
2
t
[A
2
Sec]
BUSSMAN
Rate
[A]
P/N
Solstart Plus 31
4,000
90
FWP 90B
Solstart Plus 44
9,100
125
FWP 125B
Solstart Plus 58
18,600
150
FWP 150B
Solstart Plus 72
80,000
175
FWP 175B
Solstart Plus 85
125,000
200
FWP 200A
Solstart Plus 105
125,000
200
FWP 200A.
Solstart Plus 145
281,000
300
FWP 300A
Solstart Plus 170
320,000
300
FWP 300A
