Siemens SIMATIC S5 Power Supply for 115U Systems

Description

This is the 6ES5951-7LB14, a power supply module from Siemens, designed for the robust and widely-used SIMATIC S5-115U PLC family. It ensures a stable and reliable power source for your controller and associated modules. The unit features a selectable input voltage of 115V or 230V AC, making it versatile for global applications. This is an essential component for maintaining or repairing existing S5-115U automation systems.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Model: PS 951 for S5-115U
• Part Number: 6ES5951-7LB14
• Input Voltage: 115V AC / 230V AC (selectable), 50 Hz
• Output Voltage 1: +5V DC, 3A
• Output Voltage 2: +5.2V DC, 1A
• Output Voltage 3: +24V DC, 0.2A

Label Info

• TYP (DIN 41752): E220G5/3WRGD
• FACT.NO/FABR.-NR: A 3101923

Application

This power supply is specifically used within the main rack of a Siemens SIMATIC S5-115U programmable logic controller. It powers the CPU, memory, and I/O modules, making it a critical component for manufacturing lines, process control, and machine automation still relying on the S5 platform.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned module instead of a new one, you contribute to a circular economy and avoid the emission of approximately 48 kg of CO2, which is equivalent to the savings from driving a car for 240 kilometers.

Availability

This unit is a legacy component but is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question?
Can this 6ES5951-7LB14 power supply be used in any SIMATIC S5 rack?
Answer:

No, this power supply is specifically designed for the SIMATIC S5-115U PLC system and fits into its corresponding mounting rack (e.g., CR700). It is not compatible with other S5 series like the S5-95U or S5-135U.

The +5.2V DC output is a dedicated voltage for programming or erasing EPROMs (Erasable Programmable Read-Only Memory) modules used with the S5-115U CPUs. It provides the slightly higher voltage required for these operations.

Before installation, ensure the voltage selector switch on the front panel is set correctly to match your mains supply (115V or 230V AC). Also, inspect the backplane connector in your S5 rack for any signs of damage or contamination that could have caused the original failure.

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Last Update: Friday, March 13, 2026