Siemens 6SL3224-0BE33-0UA0 — SINAMICS G120 PM240 Power Module, 30 kW / 480V, Unfiltered with Braking Chopper

Overview

The 6SL3224-0BE33-0UA0 is a 30 kW power module from Siemens' SINAMICS G120 drive family — one of the most widely deployed variable frequency drive (VFD) platforms in industrial automation. Specifically, this is the PM240 variant: unfiltered, with an integrated braking chopper, designed for three-phase AC applications across the 380–480 V voltage band.

At its core, the PM240 is the muscle of a G120 system. It handles all the power conversion work — rectifying incoming AC supply, managing DC bus voltage, and generating the variable-frequency output that controls motor speed and torque. The control intelligence lives in a separate Control Unit (CU230/CU240 series), which snaps directly onto the PM240 via a standardized interface. This modular approach is one of G120's defining strengths: you can swap, upgrade, or reconfigure the drive without touching the power stage or rewiring the panel.

Key Technical Specifications

High Overload vs. Low Overload — Which Mode Applies to You?

This is a detail that catches out first-time G120 users, so it's worth explaining clearly.

High Overload (HO) mode rates the module at 30 kW. It's the correct choice for loads that demand short, sharp torque peaks — conveyor systems that must start under full load, hoists, extruders, or any application where the motor may need to push well beyond its steady-state rating for a few seconds at a time. The drive will sustain 200% rated current for up to 3 seconds, and 150% for up to 57 seconds, before thermal limiting kicks in.

Low Overload (LO) mode rates the same hardware at 37 kW. Here the overload demands are gentler — centrifugal pumps, fans, and compressors rarely see sudden torque spikes. By designing for a softer overload profile, Siemens allows the same PM240 to serve a physically larger motor in these applications, making better use of the hardware you already have.

The distinction matters at the time of motor selection, not during installation. Both modes run on identical hardware.

Integrated Braking Chopper — Why It's There

Standard variable frequency drives dump regenerative energy (from decelerating loads) back into the DC bus. Without somewhere for that energy to go, the DC bus voltage climbs until the drive faults. The PM240 solves this with an onboard braking chopper circuit, which routes excess energy into an external braking resistor (sold separately, sized to the application).

This makes the PM240 well-suited for applications with:

• Frequent or rapid deceleration cycles
• High-inertia loads (large flywheels, centrifuges, winding/unwinding systems)
• Vertical loads or hoisting systems where the load can drive the motor as a generator

If your application runs in a steady-state direction without significant regenerative braking demands, the chopper simply stays inactive — it adds no drawback to install.

What the PM240 Does Not Include

Before ordering, note what ships with the 6SL3224-0BE33-0UA0:

• No Control Unit. The PM240 requires a compatible CU (such as the CU240E-2, CU230P-2, or others in the G120 lineup) to function. The correct CU depends on your fieldbus protocol, safety requirements, and I/O needs.
• No BOP (Basic Operator Panel). Local parameter adjustment requires an optional BOP-2 or connection to a commissioning tool like STARTER or Startdrive.
• No EMC line filter. The "0UA0" suffix in the part number indicates an unfiltered unit. If your installation requires compliance with EMC Category C2 or C3 limits, an external line filter must be added or the filtered variant (suffix "0AA0") should be specified instead.

Typical Applications

The 6SL3224-0BE33-0UA0 is found across a broad range of process and factory automation environments:

• Pump and fan systems (operating in LO mode for maximum motor rating)
• Conveyor lines and material handling (taking advantage of HO mode for load-dependent starting)
• Compressors and mixers
• Machine tool auxiliary axes
• Packaging machinery
• HVAC air handling units in larger commercial or industrial buildings

Its 30/37 kW power range covers motor sizes that sit at the boundary between smaller variable-speed drives and larger, cabinet-mounted drive systems — making the G120 a practical choice where panel space and installation flexibility matter.

Frequently Asked Questions

Q1: Does this power module work with all SINAMICS G120 Control Units?

Most G120 Control Units from the CU230P-2 and CU240E-2 families mount directly to the PM240. However, not every CU-PM combination is valid — Siemens publishes a compatibility matrix in the G120 system manual (available on the Siemens Industry Online Support portal) that confirms which combinations are approved. If you are replacing a drive that was previously working, match the CU part number from the existing installation rather than assuming any CU will work with this PM240.

Q2: What is the difference between the 6SL3224-0BE33-0UA0 (unfiltered) and the 6SL3224-0BE33-0AA0 (filtered)?

The hardware inside both units is essentially the same — same frame size, same power rating, same braking chopper. The filtered variant (0AA0) adds an integrated Class A EMC line filter, making it physically taller (635 mm vs. 497 mm) and better suited for installations where conducted electromagnetic emissions must meet EN 61800-3 Category C2 requirements. The unfiltered 0UA0 is specified where an external filter is already present in the panel, where the drive is connected to an industrial supply exempt from strict EMC requirements, or where the smaller footprint is a priority.

Q3: Can this drive be used on a 480 V supply, as specified in the product title?

Yes. The rated input range of 380–480 V 3AC (±10%) means the drive is designed to operate correctly at any nominal supply voltage between 380 V and 480 V. A 480 V supply falls within this range. The ±10% tolerance means the drive will handle transient voltages up to approximately 528 V without fault — useful in supply systems where voltage regulation is imperfect.

Q4: Is the 6SL3224-0BE33-0UA0 still in production?

This specific part number has been listed by some distributors as discontinued or transitional. Siemens actively develops the G120 platform, and successor configurations may carry updated part numbers reflecting revised hardware revisions. For ongoing projects, it is advisable to confirm current availability and check whether a direct replacement part number applies. Refurbished and exchange units from reputable industrial automation suppliers remain a practical option for maintenance applications.

Q5: What braking resistor should be paired with this module?

The appropriate braking resistor depends on the braking power your application requires — specifically the peak braking power, the duty cycle of braking events, and the total energy to be dissipated per cycle. Siemens publishes resistor sizing guidance in the SINAMICS G120 hardware installation manual (document number 6SL3097-4AL00-0BP3 or equivalent for your firmware version). As a starting point, the resistor must be rated for the PM240's peak chopper power and thermally sized for the repetition rate of your deceleration cycles. Undersizing the resistor is a common commissioning error that leads to premature thermal shutdown.

Note: The 6SL3224-0BE33-0UA0 power module is supplied without a Control Unit or operator panel. Full system function requires a compatible SINAMICS G120 Control Unit, ordered separately. Always verify specifications against the Siemens product datasheet prior to installation.