Description, device design, dimension drawing
2.1 Device description
SITOP expansion modules
24 Equipment Manual, 09.2022, A5E36605235-2-76
2.1.3.2 SITOP inrush current limiter
The SITOP inrush current limiter is used to reliably reduce inrush currents, e.g. caused by
transformers or switched-mode power supplies as a result of the rectifier circuit at the input
with capacitor charging.
It is used for 1-phase AC line supplies with 100 V, 120 V or 230 V or for 2 and 3- phase line
supplies with 208 V to 480 V line voltage on the line side, upstream of transformers or power
supplies. Using the integrated fixed resistor, it limits the inrush current to e.g. < 10 A at
230 V. In steady-state operation, the limiting resistor is bypassed after approx. 120 ms,
therefore minimizing the associated power loss.
Figure 2-8 Design
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