Description
PS 955 — Power Supply
Siemens · PS 955 · 6ES5955-7NC12
Description
SIMATIC S5 PS 955 is a plug-in central-rack power supply for the S5-115U/135U/155U/155H central controllers. It converts 120/230 V AC (wide-range) mains into the regulated +5 V DC logic bus supply plus auxiliary voltages for programmers and communication processors, and includes electronic short-circuit protection with mains buffering. It is the higher-current sibling of the PS 951/PS 952 family used where higher rack loading is required.
Key specifications
Parameter | Value |
Function | Regulated logic power supply for S5-115U/135U/155U/155H rack |
Input voltage | 120/230 V AC, wide range (per PS 95x family; verify nameplate) |
Output (logic bus) | +5 V DC regulated; higher-current variant of PS 951 (verify exact A rating on unit) |
Auxiliary outputs | +5.2 V for PG interface; +24 V for communication processors (typical of PS 95x family) |
Protection / buffering | Electronic short-circuit protection; ~20 ms mains buffering (per family) |
Mounting | Central rack (ZG) power supply slot, S5-115U/155H chassis |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | PS 955 |
Part number | 6ES5955-7NC12 |
Category | Power Supply |
System family | SIMATIC S5-115U/155H |
GT stores quantity | 24 |
Data confidence | medium |
Manuals filed (007 - Manuals)
- S5_155H_CPU948R_M_Vol.1_E06_99.08_e.pdf — S5-155H central controller manual covering rack power supplies including PS 95x family
- Manual CP1430 English Vol1.pdf — General S5-115U/155H system reference (secondary; power supply section only)
Notes
No PS 955-specific Siemens datasheet was located distinct from the PS 951/PS 952 family; specs given are per the PS 95x power-supply family for S5-115U/155H racks. Verify exact output current (A) rating on the physical unit nameplate before use in critical specs.
Source: Sohar 1 DCS field-component stores inventory (Total GT_BOP). Filed in the AI HW Knowledge Base.