Product Introduction
The Siemens 6SE7021-0EA51-Z is a SIMOVERT Masterdrives vector control converter unit in compact plus format. Designed as a spare part, this industrial automation module delivers reliable AC drive performance for three-phase systems. With an IP20 enclosure, it suits controlled environments where dust and moisture are minimal. This unit is part of the MASTERDRIVES subrange and is now in the obsolete phase, making it a critical replacement component for existing installations.
Technical Specifications Breakdown
Below are the key parameters for the Siemens 6SE7021-0EA51-Z. Every value comes directly from the product database.
| Parameter |
Value |
| Input Voltage |
380-480 V AC, 3-phase |
| Frequency |
50/60 Hz |
| Rated Current |
10.2 A |
| Rated Power |
4 kW |
| Protection Class |
IP20 |
| Dimensions (cm) |
10.20 x 45.70 x 35.60 |
| Weight |
8.50 kg |
These specifications confirm the Siemens 6SE7021-0EA51-Z is suitable for medium-power vector control applications. The 4 kW rating and 10.2 A current capacity cover many standard motor drives in manufacturing lines.
Real-World Applications
The Siemens 6SE7021-0EA51-Z excels in applications requiring precise torque and speed control. Common use cases include:
- Conveyor systems in automotive assembly plants where variable speed control reduces belt wear and energy consumption.
- Pump and fan drives in HVAC systems that benefit from the unit’s vector control algorithm to maintain constant pressure or airflow.
- Extruder drives in plastic processing, where the Siemens 6SE7021-0EA51-Z delivers consistent torque even at low speeds.
Each scenario leverages the converter’s ability to handle 3-phase 380-480 VAC input and provide up to 4 kW of output power.
Installation & Setup Guidance
Mount the Siemens 6SE7021-0EA51-Z on a flat, non-flammable surface inside an enclosure that meets IP20 requirements. Ensure adequate clearance for air circulation around the heatsink. Use shielded motor cables to minimize electromagnetic interference. Connect the three-phase supply to the L1, L2, L3 terminals, respecting the phase sequence. The control terminals allow for start/stop commands and analog speed reference inputs. Refer to the product manual for detailed wiring diagrams specific to your application.
Selection Guide & Purchasing Advice
Because the Siemens 6SE7021-0EA51-Z is obsolete, verify compatibility with your existing SIMOVERT Masterdrives system before ordering. Check the exact firmware revision required and ensure the unit matches your motor’s voltage and power ratings. For reliable sourcing, consider suppliers like ubest101 that specialize in industrial automation spares. Always confirm product condition (new or refurbished) and availability before purchase.