ST950S Plus+ Installation and Commissioning Manual
Figure 13. Master Switch Unit - Standard
3.5. Fuses
There are several user replaceable fuses present on the board that provide protection where power
supplies from the system leave the board to power the users’ equipment.
Important:
When replacing a fuse, it is important to fit the correct type for continued protection of the
ST950 CPU Card and user’s equipment.
F1 – Handset – 500mA Quick blow
F2 – Aux RS232 Modem power supply output – 500mA Quick blow
The replacement fuse for F1 and F2 is Yunex Traffic part number 518/4/97070/004. This part number
calls up the holder and fuse. Remove the fuse and discard the holder.
3.6. 48V PSU
The 48V (480W) DIN rail mounted PSUs distribute the 48V supply to the Nodes via a redundancy
module and subsequently the CIC/CTB PCBs.
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