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Siemens 6SL3352-1AE33-1AA1 Power Block (S120 Motor Module Power Unit)
Overview
This part is
not an independent control unit, it is a power block spare part for SINAMICS S120 high-power cabinet-type single-axis motor modules, used to replace the internal power conversion unit of the motor module, responsible for DC bus to three-phase AC inversion to drive heavy-duty motors.
It matches S120 cabinet single motor modules with DC bus 510–750 VDC, rated output current 310 A, forced air cooling structure, nickel-plated busbars and anti-corrosion painted circuit board design.
Core Specifications
- Electrical Parameters
- DC bus voltage range: 510 ~ 750 VDC
- Rated output current: 310 A
- Three-phase AC output for asynchronous / synchronous motors
- Built-in IGBT power unit, integrated current sampling and temperature detection circuit
- Environmental & Mechanical
- Protection class: IP20 (cabinet internal installation only)
- Operating temperature: 0 ~ +40°C (derating above 40℃)
- Humidity: ≤80% RH, non-condensing
- Max altitude 1000m without power derating
- Cooling mode: forced air cooling
- Structure
- Integrated power module + busbar assembly
- Standard plug-in replacement design for S120 cabinet motor modules
- Built-in NTC thermistor for power semiconductor overtemperature monitoring
Key Features
- Factory pre-assembled power spare part, direct replacement without separate power component matching
- High efficiency power conversion (efficiency up to 98.7%), low heat loss under continuous heavy load
- Integrated hardware protection logic: overcurrent, short-circuit, overheat, DC bus overvoltage
- Nickel-plated busbars enhance conductivity and anti-oxidation performance for long-term stable operation
- Conformal coated PCB, suitable for dusty, mildly corrosive industrial workshop environments
- Compatible with S120 CU320/CU320-2 control units via DRIVE-CLiQ communication
Applications
Spare power unit for high-power SINAMICS S120 cabinet single-axis drives, widely used in metallurgical rolling lines, mine hoists, large extruders, paper machine main drives, cement kiln main motors and other heavy-duty high-power speed regulation equipment.
The structure and details of the product:

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