Siemens 6ES5955-7NC11 Power Supply Module

Technical Specifications and System Compatibility

The Siemens 6ES5955-7NC11 power supply module belongs to the SIMATIC S5 955 series and serves as the dedicated energy source for the S5-155H and S5-155U high-end PLC systems. This unit converts AC input voltage into stable DC power for the system backplane and all installed modules. It provides a 5V DC output with a rated current of 14A . The module also supports a 24V DC input variant, offering installation flexibility . Its dimensions measure approximately 31.0 cm x 21.0 cm x 19.0 cm, and it weighs about 1.34 kg . The module carries the commodity code 85389091 and has an EAN of 4025515124818 .

Functional Capabilities and High-Power Design

The 6ES5955-7NC11 module actively supplies robust power to large S5-155U configurations, especially those with CPU 948 and numerous I/O modules. Its high-current output, available in both AC/DC and DC/DC variants, ensures the system backplane receives stable voltage. The module includes comprehensive protection features such as short-circuit, overvoltage, and overload protection to safeguard expensive CPUs and I/O modules from electrical faults. Furthermore, its robust construction and efficient cooling design guarantee reliable operation in demanding industrial environments.

Application Scenarios and Legacy Support

This power supply module suits large-scale industrial applications in petrochemical, power generation, and steel production facilities. It integrates with S5-155H and S5-155U systems, serving as the critical power source for extensive control networks. The Siemens 6ES5955-7NC11 is a key replacement component for maintaining legacy S5-155U/H infrastructure. Many facilities continue to rely on this module to sustain their existing automation equipment . For system integrators, this power supply provides a practical solution for extending the service life of established S5-based systems.