Siemens 6ES5955-3LF41 Power Supply Module for SIMATIC S5

Core Power Delivery for Large S5 Systems

The Siemens 6ES5955-3LF41 is a high-output power supply module for the SIMATIC S5-135U, S5-155U, and EU 185U control systems. This unit provides stable DC power to processors, I/O modules, and memory submodules. It accepts a wide AC input voltage range of 230/120 V AC. Consequently, it delivers a robust 5V DC output at 40 A for demanding applications.

Robust Design and Integration

This power supply module is designed specifically for large S5-135U and S5-155U racks, which are used in complex automation tasks such as continuous casting lines and power plant control. It is part of the 955 product range. The 6ES5955-3LF41 is a discontinued component, with an end-of-life date of October 1, 2010. Furthermore, it is not RoHS compliant due to a lead content exceeding the threshold. As a result, its use is limited, and stocking replacement parts is crucial for legacy system maintenance.

Technical Specifications and Physical Details

Engineers designed this module for straightforward installation in the designated slot of an S5 central rack. Its specifications define the input voltage, output ratings, and form factor. The following table details its key functional and physical parameters.

Application in Legacy S5 Support

Plant engineers rely on this power supply module to maintain and support existing large-scale S5-based automation systems. It is a critical component in heavy industries like steel, automotive, and power generation where S5 controllers remain in operation. The Siemens 6ES5955-3LF41 ensures continued power delivery for proven legacy equipment. Therefore, sourcing tested and functional units is essential for lifecycle management of classic Siemens automation platforms.