Original Siemens Power Supply Board 6SL3352-6BE00-0AA1 6SL33526BE000AA1 6SL3352-6BEOO-OAA1 6SL3 352-6BE00-0AA1

Siemens 6SL3352-6BE00-0AA1 | SINAMICS/MICROMASTER PX Replacement Power Supply — 380–480V 3AC for AC Drive and Motor Modules

Part Number: 6SL3352-6BE00-0AA1

Manufacturer: Siemens AG (Austria)

Product Type: PX Replacement Power Supply — Internal Switching Power Supply PCB Assembly

Product Family: SINAMICS / MICROMASTER PX

Input Voltage: 380–480V 3AC, 50/60 Hz 

Overview

The 6SL3352-6BE00-0AA1 is the PX replacement power supply for Siemens SINAMICS and MICROMASTER drive platforms.

This internal switching power supply assembly converts the drive's three-phase 380–480V AC bus into the regulated low-voltage DC rails that power the drive's control electronics, gate driver boards, cooling fans, and interface circuits. It is the energy source for everything inside the drive that is not the motor current itself.

The "PX" designation in the part name identifies this as a cross-platform power supply that serves both the SINAMICS drive family and the MICROMASTER series — two distinct Siemens drive platforms that share this power supply board architecture in the overlapping power range.

This cross-platform design reduced Siemens' spare parts inventory requirements and standardised the power supply as a common service part across multiple drive product families.

When this board fails, the drive loses its internal supply voltages and cannot operate — the control board, gate drivers, and communication interfaces all go dark. The symptom is a completely unresponsive drive: no display, no fault codes, no network communication.

The 6SL3352-6BE00-0AA1 is therefore one of the highest-priority spare parts for any site running SINAMICS or MICROMASTER drives in the applicable power range.

Key Specifications

What the PX Power Supply Does Inside a Drive

A SINAMICS or MICROMASTER drive chassis contains two distinct electrical domains: the power section, which operates at DC bus voltage (typically 540–650V DC) and carries the motor current, and the control section, which operates at low voltages (typically 24V DC, 15V DC, and 5V DC) and carries the logic, communication, and gate drive signals.

The 6SL3352-6BE00-0AA1 bridges these two domains.

It draws its primary power from the drive's three-phase AC input — stepping down from the 380–480V AC supply and converting to the regulated DC voltages that the control section requires. 

This design means the control section remains powered from the AC supply even when the drive's DC bus is pre-charging or in fault state, which allows the drive to display fault codes and communicate diagnostics even when the power section is blocked.

The gate driver boards that fire the inverter IGBTs draw their isolated gate voltage from the PX power supply. Fibre-optic transmit and receive circuits, current measurement signal conditioning, temperature monitoring, and the drive's communication interfaces all draw from this same supply.

A degraded power supply that drifts out of regulation on any one rail causes difficult-to-diagnose intermittent faults — partial gate drive failures, erratic current measurement, random communication losses — before the drive fails completely.

Cross-Platform Compatibility: SINAMICS and MICROMASTER

The 6SL3352-6BE00-0AA1's designation as a "SINAMICS/MICROMASTER PX" replacement confirms its role as a shared component across two drive product families. The SINAMICS platform (including SINAMICS G120, S120, and related chassis drives) and the MICROMASTER 4 platform (MM430, MM440) share enough architectural similarity in their control power supply requirements that Siemens standardised this assembly across both.

For maintenance teams managing mixed fleets of SINAMICS and MICROMASTER drives, this cross-compatibility is practically useful: a single spare power supply board can serve drives from both families.

Confirming the compatibility with the specific drive model before installation requires checking the drive's spare parts documentation, which lists which drive configurations accept the 6SL3352-6BE00-0AA1.

Repair vs Replacement

The 6SL3352-6BE00-0AA1 is listed by Siemens as a replacement assembly — meaning Siemens' intent was that a failed board is replaced rather than repaired.

However, with the product now obsolete and only available in the aftermarket, board-level repair is a viable alternative when replacement boards are unavailable or cost-prohibitive.

Specialist drive electronics repair companies can address the most common failure modes: failed primary-side switching transistors or controllers, degraded output filter capacitors on the secondary rails, and damaged primary-side inrush limiting circuits.

A repaired board should be load-tested at all output voltages under representative current loads before installation in a production drive.

FAQ

Q1: The SINAMICS drive is completely unresponsive — no display, no LEDs, no response on any communication interface. The AC supply voltage has been confirmed present and within range. Could the 6SL3352-6BE00-0AA1 be the cause?

A completely dark, unresponsive drive with confirmed AC supply is the classic signature of a failed internal power supply. The drive's control electronics have no power source other than the 6SL3352-6BE00-0AA1.

Before replacing the board, verify that the AC supply fuses and any input circuit breakers within the drive are intact — some drives include internal fusing on the power supply input. If fuses are good and the board has confirmed AC voltage at its input connector, the board has failed and replacement is required.

Q2: The drive works normally for the first 20–30 minutes after power-up, then starts producing erratic fault codes and eventually stops communicating. Could the 6SL3352-6BE00-0AA1 cause this pattern?

Thermal-dependent intermittent behaviour — normal at cold startup, failing after warm-up — is a classic sign of degraded filter capacitors or a marginal switching transistor in a DC-DC converter. As the power supply warms up, a partially failed component drifts out of specification.

Secondary-rail voltages that are borderline at room temperature fall below their valid range at operating temperature, causing the logic-level irregularities that appear as random faults.

Measuring the secondary rail voltages after 30 minutes of operation will confirm if any rail has dropped below its nominal value.

Q3: The 6SL3352-6BE00-0AA1 is listed for both SINAMICS and MICROMASTER drives. If removed from a decommissioned MICROMASTER 440, can it be installed directly into a SINAMICS drive of the appropriate power range?

Cross-installation between MICROMASTER and SINAMICS drives requires confirming compatibility via the specific drives' spare parts documentation. The physical connectors, mounting configuration, and output rail specifications must match.

In cases where the power supply serves both platform families by design, cross-installation is often supported — but this should be confirmed against Siemens' documentation for the specific drive models involved rather than assumed based on the part number alone.

Q4: The 6SL3352-6BE00-0AA1 weight is listed at 1.6 kg. This seems relatively heavy for a control power supply board. What accounts for this weight?

The 1.6 kg weight reflects a substantial assembly that includes the line-frequency transformer or high-frequency isolation transformer for primary-to-secondary galvanic isolation, the bulk filter capacitors on both primary and secondary sides, and the heat-sinking for the primary-side switching devices.

Industrial drive power supplies that draw from 380–480V AC bus must include robust filtering and isolation components that add significant mass compared to lightweight logic-level DC-DC converters.

Q5: A replacement 6SL3352-6BE00-0AA1 has been installed and the drive powers up normally. Should any parameters be re-verified or any commissioning steps be performed after replacement?

The PX power supply does not store drive parameters — all parameters remain on the Control Unit or control board. After power supply replacement, verify that the drive reaches its normal ready state without any supply-related fault codes. Confirm that the cooling fan starts normally (which is powered by the supply).

If the drive uses a 24V external power supply option for maintaining communication during AC power-off events, verify this circuit is also functioning correctly after the replacement.