Siemens 6ES5955-3LC41 SIMATIC S5 Power Supply Module

The 6ES5955-3LC41 is a high-capacity power supply module from the SIMATIC S5 family, specifically engineered for the S5-135U/155U and EU 183/185U programmable controller systems. This module serves as a central power source, converting standard line voltage into the stable 5V DC output required for CPU and I/O module operation. With an output current rating of 18A, it is designed to handle the power demands of larger, more complex legacy automation configurations.

Features

• Series: SIMATIC S5 (135U/155U)
• Function: Central power supply module
• Input Voltage: Supports 120V / 230V AC
• Output: 5V DC at 18A
• Compatibility: Designed for S5-135U/155U and EU 183/185U central controllers
• Status: Obsolete (Successor: 6ES5955-3LC42)

Applications

• Powering legacy SIMATIC S5 rack-based automation systems
• Maintaining continuous operation in established manufacturing lines
• Control cabinet energy distribution for large-scale automation architectures
• Retrofitting or component replacement in existing S5-135U/155U setups

Technical Specifications

Installation Guidelines

• Module Seating: Ensure the power supply is firmly seated in the dedicated power supply slot of the S5 rack. The module is heavy (6.22 kg); verify that the rack mounting frame is secure before insertion.
• Input Voltage Selection: Confirm the voltage jumper or switch settings match your local facility power (120V or 230V AC) before energizing.
• Ventilation: These units generate significant heat. Maintain the specified clearances above and below the rack to allow for natural convection cooling.
• Connections: Use appropriately rated cables for the AC input and ensure the 5V DC backplane connections are clean and free of corrosion.
• Maintenance: As this is an obsolete component, check for signs of aging in electrolytic capacitors if utilizing surplus or long-term stored units.