Siemens 6ES5955-7NC12 Power Supply Module

This power supply module provides stable DC power for SIMATIC S5 racks. It converts AC line voltage to regulated outputs for backplane modules. Therefore, this component ensures reliable system operation in industrial environments.

Physical Dimensions and Weight Specifications

The Siemens 6ES5955-7NC12 features a rugged metal housing for heat dissipation. Its width occupies two standard slots in the S5 rack. The total depth reaches 233 mm for backplane connectivity. Consequently, technicians can install this unit alongside other modules without spacing issues.

Interface Types and Connection Layout

The Siemens 6ES5955-7NC12 provides a 3-terminal AC input block on the top. A 4-terminal DC output block connects directly to the backplane bus. The front panel carries LED indicators for output status and overload warnings. Hence, operators can monitor power conditions at a quick glance.

Component Count and Internal Architecture

This power supply contains one main transformer and a rectifier bridge circuit. The board holds four large electrolytic capacitors for output filtering. You will also find a switching regulator for multiple DC voltage rails. An onboard temperature sensor shuts down the unit during overheating events.

Energy Storage and Hold-Up Time

The Siemens 6ES5955-7NC12 stores energy in four 2200µF output capacitors. This storage provides a 25 ms hold-up time after AC loss. Therefore, the backplane modules continue operating during brief power interruptions. The unit requires no external battery for this function.

Protection Features and Operating Limits

The module includes short-circuit protection on all output rails. It also features over-voltage clamping for sensitive backplane components. Users can operate this supply in temperatures from 0°C to 60°C. A built-in fan cools the internal components under heavy loads.