How does shipping work for orders on MRO Exchange?

Most orders ship within 1–2 business days via UPS. Larger equipment ships via freight carrier, and customers can use the shipping estimator on the product page for a location-specific quote. Local pickup is also available at the Fairfield, IL facility, typically ready within 4 hours.

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MRO Exchange accepts all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available, with payment due prior to shipment. Custom terms are available for established accounts.

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Siemens 6SN1121-0BA11-0AA1 600 V DC Closed Loop Control Module

$1,599.00 USD

Sale Sold out

ConditionSurplus - Untested MPN6SN1121 Stock #0226-00381

Photos reflect current condition. Items differing from description may be eligible for return or refund — see our condition guide.

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Estimated package weight: 10.0 lbs

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The Siemens 6SN1121-0BA11-0AA1 is a plug-in closed-loop control module for the SIMODRIVE 611-A drive system, configured for main spindle drives using 1PH asynchronous motors in the universal analog HSA configuration. This module installs into the SIMODRIVE 611-A power module chassis and manages closed-loop speed and torque regulation for the spindle axis via analog setpoint interface. Compatible CNC platforms include SINUMERIK 840C, 840D, 810D, and earlier Siemens control generations built around the 611-A drive family.

Siemens discontinued this part number in September 2018, making surplus stock the primary source for facilities maintaining installed SIMODRIVE 611-A spindle systems. The unit ships in its original Siemens cardboard box. Version C is marked on the module label; the box carries Version D with a separate serial number (T-M12035527 on box, T-K22024418 on module label), indicating the module and packaging were separately serialized. Both are included. The module shows no visible signs of installation or damage. Buyers should confirm version and firmware compatibility with their existing 611-A drive chassis and SINUMERIK control revision prior to installation.

Stock # 0226-381

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Frequently Asked Questions

Shipping & Handling

Most orders ship within 1–2 business days via UPS, but expedited same-day handling is available as an add-on to orders in cart. Larger equipment ships via freight carrier. Use the shipping estimator above for a location-specific quote. Local pickup is also available at our Fairfield, IL facility, typically ready within 4 hours.

Returns & Condition

All items are sold as-described based on the photos and condition listed. If an item arrives differing from its description, it may be eligible for return or refund. See our full condition guide for details on our grading terms.

Payment Options

We accept all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available by selecting "Purchase Order / Wire Transfer" at checkout. Payment is due prior to shipment. Contact us for custom terms on established accounts. Tax exemptions are honored if proper documentation is provided.