Original Siemens CIB Ommunication Component 6SL3351-6FE33-1AA1 6SL33516FE331AA1 6SL3 351-6FE33-1AA1

Siemens 6SL3351-6FE33-1AA1 | MICROMASTER 430 PX Control Interface Board — 380–480V 3AC / 50/60 Hz / 310A

The Interface Layer Specific to MICROMASTER 430

The 6SL3351-6FE33-1AA1 is the Control Interface Board (CIB) for Siemens' MICROMASTER 430 PX drive at the 310A current class. The MICROMASTER 430 is Siemens' drive family optimised for pump and fan applications — vector control for variable-torque centrifugal loads, with the energy-saving capability and application-specific functions that constant-torque general-purpose drives like the MM440 are not primarily designed for.

The "FE" prefix in the 6SL3351 part number identifies this CIB as specific to the MICROMASTER 430 PX platform — distinguishing it from the "GE" variants which serve the MICROMASTER 440 PX. These two CIB families are not interchangeable even at the same voltage and current class, because the MM430 and MM440 power modules carry application-specific circuitry that each CIB is matched to.

The CIB sits between the power module's IGBT stage and the drive's control electronics. It routes the gate drive signals from the control unit to the power transistors and returns the power stage's current and voltage measurements back to the control unit for closed-loop control and protection. At 310A, this board handles the gate drive for the full power transistor switching current at this drive rating.

Key Specifications

MM430 PX CIB Family — Current Class Selection

Each CIB is matched to its specific power module current rating. Installing a CIB from a different current class — even within the MM430 PX family — may produce protection threshold mismatches or gate drive configuration errors. Confirm the power module's current rating before specifying the replacement CIB.

FAQ

Q1: What is the difference between a MICROMASTER 430 PX CIB and a MICROMASTER 440 PX CIB?

The "FE" series CIBs (6SL3351-6FE) serve MICROMASTER 430 PX power modules; the "GE" series (6SL3351-6GE) serves MICROMASTER 440 PX power modules. Though both serve the same CIB function at similar voltage and current classes, the two drive platforms are electrically different and their CIBs are not interchangeable. Confirm the drive model (MM430 vs MM440) before ordering.

Q2: What fault symptoms suggest the CIB on a MM430 PX drive has failed?

CIB failures typically manifest when the drive's output stage is activated — overcurrent, ground fault, or phase imbalance faults at the point of motor energisation, rather than at idle. If the drive's control unit initialises and communicates normally but fails when the gate signals are applied to the power stage, the CIB is in the fault path. Confirm there is no external fault (motor short, cable damage) before concluding CIB failure.

Q3: What does the "AA1" redesign suffix indicate?

The AA1 suffix identifies a design revision update from the AA0 original — typically a component obsolescence update, reliability improvement, or circuit change within the same functional specification. The AA1 redesign is the standard replacement for AA0 installations. Both revisions serve the same 310A MM430 PX power module position.

Q4: Must the drive be fully powered down to replace the CIB?

Yes. The CIB is in direct contact with the power stage's gate drive circuits and current measurement paths, which operate at dangerous DC bus voltages (typically 500–650V DC at 380–480V AC input). De-energise the drive and wait for the DC bus to discharge fully (the drive's charge indicator LED must be extinguished) before opening the drive housing. Do not work on the power module with residual DC bus charge present.

Q5: Where is the 6SL3351-6FE33-1AA1 sourced?

Through the Siemens MICROMASTER 430 drive spare parts supply — Siemens Industry Mall, Siemens-authorised service partners, and the established MM430 drive repair and spare parts aftermarket. Confirm 6SL3351-6FE33-1AA1 exactly — both the "FE" (MM430) designation and the "33-1" (310A) current class suffix must match the installed power module.