Siemens 6SL3351-6GE36-1AB3 Spare for S120 Automation

Siemens 6SL3351-6GE36-1AB3 Maintenance-Ready Spare for S120 Automation

The Siemens 6SL3351-6GE36-1AB3 is a high-capacity 400kW Booksize Power Module within the SINAMICS S120 drive system — a cornerstone component in heavy industrial automation environments including steel processing, paper mills, mining conveyors, and large-scale HVAC installations. When this module fails or reaches end-of-service life, the downstream impact is immediate: production lines halt, process continuity is broken, and every hour of unplanned downtime translates directly into measurable financial loss. Holding a verified original spare of the 6SL3351-6GE36-1AB3 in your maintenance inventory is not optional for critical operations — it is a fundamental risk mitigation strategy.

This listing provides an original Siemens 6SL3351-6GE36-1AB3 Power Module, sourced, inspected, and dispatched with full functional verification. Each unit ships with a 12-month warranty covering manufacturing defects and operational failure under normal industrial use conditions. Our supply chain supports long-term procurement for maintenance engineers managing aging S120 infrastructure, ensuring you are never left without a qualified replacement when it matters most.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

Replacing the 6SL3351-6GE36-1AB3 in a live S120 system is rarely an isolated task. Experienced maintenance engineers understand that a power module failure is often symptomatic of broader stress across the drive cabinet. A thorough replacement procedure should include inspection and, where necessary, simultaneous replacement of adjacent components to prevent repeat failures and ensure system stability after recommissioning.

Begin with the CU320-2 DP or CU320-2 PN Control Unit, which governs the entire S120 axis group. A power surge or DC bus fault that damages the 6SL3351-6GE36-1AB3 may have also corrupted firmware or damaged the control unit’s internal logic. Verify parameter sets and DRIVE-CLiQ topology before restarting. Next, inspect the 6SL3120-1TE26-0AA3 or equivalent Single Motor Module connected downstream — these axis modules share the DC bus and are exposed to the same transient conditions.

The DRIVE-CLiQ cables (6FX2002 series) connecting the power module to the control unit and motor modules should be visually inspected for connector damage, pin corrosion, or cable jacket deterioration. A faulty DRIVE-CLiQ link will prevent the replacement module from being recognized by the CU320-2, causing commissioning failures that are easily misdiagnosed as hardware faults.

Check the 24V DC SITOP PSU300S or equivalent power supply module that feeds the control electronics. Undervoltage or ripple on the 24V rail is a common root cause of intermittent S120 faults and can accelerate power module degradation. Simultaneously, inspect the main circuit breaker and input fusing — a 400kW module draws significant inrush current, and undersized or aged fuses may have operated partially without tripping fully.

For systems using Siemens SIMATIC S7-300 or S7-400 PLCs as the supervisory controller, verify that the PLC’s analog output cards and digital I/O modules (such as the 6ES7321 or 6ES7322 series) are correctly signaling speed references and enable commands to the S120 drive. A misconfigured or failed I/O card can cause the replacement module to behave erratically post-installation. If the system uses PROFIBUS DP or PROFINET for drive communication, confirm network termination resistors are in place and that the CU320-2’s communication parameters match the PLC configuration.

Finally, review the braking resistor or regenerative feedback unit if the application involves dynamic braking. Overloaded or failed braking resistors are a frequent cause of DC bus overvoltage faults that can destroy power modules prematurely. Replacing the 6SL3351-6GE36-1AB3 without addressing a faulty braking circuit will result in repeat failure within a short operating period.

Site Replacement Workflow

Step 1 — Isolation and Lockout/Tagout: De-energize the drive cabinet, apply LOTO procedures, and allow the DC bus to fully discharge (minimum 5 minutes after power-off, verify with a calibrated voltmeter before touching any bus bars).

Step 2 — DRIVE-CLiQ Topology Backup: Before removing the faulty module, use STARTER or Startdrive commissioning software to export the current drive topology and parameter set. This backup is essential for rapid recommissioning of the replacement 6SL3351-6GE36-1AB3.

Step 3 — Physical Removal: Disconnect DRIVE-CLiQ cables, DC bus connectors, and motor output terminals in sequence. Note cable routing and labeling before removal. The Booksize format allows the module to slide out of the cabinet rail without disturbing adjacent modules.

Step 4 — Installation of Replacement Module: Slide the new 6SL3351-6GE36-1AB3 into position, reconnect all terminals in reverse order, and verify torque specifications on power terminals per Siemens installation guidelines.

Step 5 — Recommissioning: Restore the parameter backup via STARTER/Startdrive. Power up in stages — control voltage first, then main power. Verify DRIVE-CLiQ recognition, check for fault codes, and run a no-load test before reconnecting the mechanical load.

Step 6 — Load Test and Handover: Perform a graduated load test, monitor DC bus voltage, output current, and thermal readings. Document the replacement in the maintenance log and update the spare parts inventory accordingly.

This structured workflow minimizes recommissioning time, reduces the risk of secondary faults, and ensures the replacement module operates within its rated parameters from the first power-up.

Spare Parts Support FAQ

Q1: Is this 6SL3351-6GE36-1AB3 an original Siemens component or a compatible substitute?
This is an original Siemens 6SL3351-6GE36-1AB3 Power Module — not a third-party compatible or remanufactured substitute. Each unit is sourced from authorized supply channels and undergoes functional verification prior to dispatch. The 12-month warranty applies to original units only.

Q2: How do I confirm compatibility with my existing S120 system before ordering?
The 6SL3351-6GE36-1AB3 is designed for the SINAMICS S120 Booksize platform and is compatible with CU320-2 DP and CU320-2 PN Control Units. Confirm your cabinet’s DC bus voltage rating, cooling configuration, and DRIVE-CLiQ firmware version. If you require compatibility verification against your specific system configuration, contact our technical team with your existing module’s nameplate data and CU320-2 firmware version.

Q3: What pre-shipment testing is performed, and what does the 12-month warranty cover?
Every 6SL3351-6GE36-1AB3 unit undergoes full functional testing before dispatch, including DC bus charge/discharge verification, DRIVE-CLiQ interface check, and thermal performance assessment. The 12-month warranty covers manufacturing defects and operational failure under normal industrial operating conditions. It does not cover damage resulting from incorrect installation, overvoltage events, or operation outside rated parameters.

Q4: Can you support long-term or repeat procurement for maintenance stock programs?
Yes. We maintain ongoing inventory of the 6SL3351-6GE36-1AB3 and related S120 components to support planned maintenance programs, annual spare parts budgets, and emergency procurement. For facilities managing multiple S120 drive systems, we recommend establishing a standing supply agreement to ensure availability during peak demand periods or when Siemens standard lead times are extended.

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