SIEMENS PS931 6ES5931-8MD11

Siemens SIMATIC S5 Power Supply PS 931

Description

The 6ES5931-8MD11, also known as the PS 931, is a robust power supply unit from Siemens, specifically engineered for the SIMATIC S5-100U PLC series. It ensures a reliable power source for your controller and associated modules, converting standard AC line voltage to a clean 24V DC output. As a legacy component, it is vital for the upkeep and repair of existing S5 automation systems worldwide.

Specifications

• Product Series: SIMATIC S5-100U
• Input Voltage: Selectable 115V AC or 230V AC
• Output Voltage: 24V DC
• Output Current: 2A
• Mounting: S5-100U Rack Integrated

Label Info

• Manufacturer: Siemens
• Model: PS 931
• Part Number (MLFB): 6ES5931-8MD11
• E-Stand (Version): 3

Application

This power supply is exclusively designed for integration into the Siemens SIMATIC S5-100U programmable logic controller racks. It provides the necessary power for the CPU and I/O modules within the system.

Country of Origin

Made in Austria.

CO2 Impact

By purchasing this reconditioned part, you help avoid the production of a new one, saving approximately 20 kg of CO2. This is equivalent to the emissions from driving a car for 100 kilometers.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

Is this power supply compatible with other SIMATIC S5 series like the S5-115U?

No, the PS 931 is specifically designed for the mechanical and electrical interface of the SIMATIC S5-100U mounting rack and is not compatible with other S5 series like the S5-95U, S5-115U, or S5-135U.

What is the significance of “E-Stand: 3”?

The “E-Stand” or version number indicates the hardware and firmware revision of the module. In complex or older systems, matching the E-Stand can be crucial for ensuring 100% compatibility and avoiding unexpected behavior.

Can I replace a 6ES5931-8MD11 with a modern SITOP power supply?

Not directly. While a modern Siemens SITOP power supply can provide 24V DC, it will not physically fit into the S5-100U backplane. The PS 931 is mechanically and electrically integrated into the rack, making it a unique requirement for these systems.

Last Update: Friday, March 13, 2026

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