Siemens 6SE7031-2EP85-0AA0 SIMOVERT MASTERDRIVES MC Rectifier Unit
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Product Information
The Siemens 6SE7031-2EP85-0AA0 is a Compact-Plus rectifier unit belonging to the SIMOVERT MASTERDRIVES Motion Control (MC) product family. Operating as an AC-to-DC power converter, this unit accepts a 3-phase input voltage of 380 V to 480 V AC at 50/60 Hz and supplies a centralized DC link output ranging from 510 V to 650 V DC. It features a continuous rated output power of 50 kW with a nominal DC output current of 120 A and a nominal input current rating of 108 A. Housed in a compact IP20 enclosure measuring 135 mm wide, 360 mm high, and 260 mm deep with a weight of 8.3 kg, the module is engineered for efficient installation inside industrial control cabinets.
In multi-axis drive architectures, the 6SE7031-2EP85-0AA0 connects directly to a common DC bus framework to deliver centralized power to single or multiple SIMOVERT MASTERDRIVES Motion Control inverter modules. When commissioning a spare unit into an existing installation, physical drop-in compatibility enables straightforward mechanical and electrical replacement. Installing a replacement unit requires verifying line supply connection phases, confirming proper busbar torque settings, and ensuring sufficient thermal clearance within the panel. ABC Industrial Parts provides tested replacement units to support legacy system maintenance and eliminate unnecessary cabinet redesigns.
Troubleshooting power distribution issues in a drive assembly begins with verifying the 3-phase AC input supply, line current balance, and intermediate DC link bus voltage level. Unstable DC voltage or loss of output generally indicates upstream utility disturbances, improper line fusing, or internal power component failure within the module. Because internal board-level components and power electronics are not field-serviceable, replacing a failed unit with a qualified replacement from ABC Industrial Parts is typically the most reliable method for restoring machine uptime.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6SE7031-2EP85-0AA0 |
| Product Family | SIMOVERT MASTERDRIVES |
| Series | Motion Control (MC) Compact-Plus |
| Component Type | Rectifier Unit |
| Input Voltage Range | 380 - 480 V AC |
| Input Frequency | 50/60 Hz |
| Phase Count | 3 |
| Nominal Input Current | 108 A |
| Nominal Output Current | 120 A |
| DC Link Output Voltage Range | 510 - 650 V DC |
| Rated Output Power | 50 kW |
| Protection Rating | IP20 |
| Dimensions (W x H x D) | 135 x 360 x 260 mm |
| Weight | 8.3 kg |
Replacement and Spare Part Considerations
The 6SE7031-2EP85-0AA0 plays a critical role in centralized drive systems by converting incoming 3-phase AC power into shared intermediate DC bus power for downstream inverter modules. When replacing an existing unit, plant personnel must verify that the replacement module matches the exact electrical specifications, including the 380-480 V AC line rating, 50 kW continuous power capacity, and 120 A nominal DC current output. Ensuring mechanical footprint equivalence within the Compact-Plus layout avoids modifications to mounting rails or busbar assemblies.
Because the SIMOVERT MASTERDRIVES lineup is in a phase-out status, sourcing direct drop-in replacement hardware is essential for maintaining continuous production equipment across automated packaging, automotive assembly, and metal forming machinery. Installing a direct replacement unit preserves original cabinet design, avoids full motion control system retrofits, and minimizes planned maintenance windows.
Frequently Asked Questions
What is the primary function of the Siemens 6SE7031-2EP85-0AA0?
The Siemens 6SE7031-2EP85-0AA0 is a Compact-Plus rectifier unit designed to convert 3-phase AC line supply (380-480 V AC) into intermediate DC link power (510-650 V DC) to feed SIMOVERT MASTERDRIVES Motion Control inverter modules.
What power and current ratings does this rectifier module support?
This module provides a continuous power rating of 50 kW with a nominal DC output current of 120 A and a nominal input current rating of 108 A.
Does replacing the 6SE7031-2EP85-0AA0 require system reprogramming?
As a dedicated power supply rectifier module within the DC bus architecture, replacement typically involves physical drop-in installation and power connection checks without needing parameter software programming, provided downstream inverter settings remain intact.
What dimensions and protection rating does the unit have?
The 6SE7031-2EP85-0AA0 features an IP20 protection rating and measures 135 mm in width, 360 mm in height, and 260 mm in depth, with an overall weight of 8.3 kg.
Which drive systems are compatible with this power supply unit?
This unit is compatible with the Siemens SIMOVERT MASTERDRIVES Motion Control (MC) series and integrates into the Compact-Plus DC bus framework.
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Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
We are not an authorised distributor of Siemens.
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