The Siemens 6SL3121-2TE21-8AA3 is a spare-part SINAMICS S120 Double Motor Module that drives two independent motors from a single booksize unit. It accepts 600 V DC input and delivers 400 V 3 AC output at 18 A per channel, so it handles two 7.5 kW induction motors on a common DC bus — typical for dual-spindle or twin-conveyor sections in a machine tool or packaging line. External air cooling means the module rejects heat to forced cabinet airflow rather than a built-in fan; plan for adequate enclosure ventilation and keep the clearance above and below the module per the SINAMICS S120 booksize mounting rules. The module supports optimized pulse patterns and extended Safety Integrated functions including DRIVE-CLiQ cabling for safe torque off and safe stop 1, so it integrates directly into a safety-rated drive system without a separate safety relay.
Siemens 6SL3121-2TE21-8AA3 SINAMICS S120 Double Motor Module
MPN6SL3121-2TE21-8AA3
Siemens SINAMICS S120 Double Motor Module, 6SL3121-2TE21-8AA3, spare part, input 600 V DC, output 400 V 3 AC, 18 A/18 A, booksize, external air cooling.
$2,091.75Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
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| Datum: 09.02.2021 | Änderungen vorbehalten © Copyright Siemens 2021 |
Product details
Frequently asked questions
What is the 6SL3121-2TE21-8AA3 used for?
It is a SINAMICS S120 Double Motor Module that drives two motors independently from a 600 V DC bus, outputting 400 V 3 AC at 18 A per channel. It is a spare part for machine-tool and automation systems using the booksize form factor with external air cooling.
Where can I buy 6SL3121-2TE21-8AA3?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
6SL3121-2TE21-8AA3