SIEMENS 6AT1120-0EA00-0AA0 Automation

( Brand: Siemens ), ( Manufacturer Part Number: 6AT1120-0EA00-0AA0 )

Review SIEMENS 6at11200ea000aa0 Used

The **Siemens 6AT1120-0EA00-0AA0** (and its variant **6AT11200EA000AA0**) is a high-performance, industrial-grade **AC drive (variable frequency drive, or VFD)** designed for precise motor control in demanding automation applications. Part of Siemens **Sinamics G120** series, this drive is engineered to deliver exceptional efficiency, reliability, and flexibility in industrial environments where energy savings, process optimization, and long-term durability are critical. Built with Siemens advanced **SINAMICS** technology, this unit integrates seamlessly into modern automation architectures, offering seamless communication via **PROFINET, PROFIBUS DP, or EtherCAT**, ensuring real-time synchronization with PLCs, SCADA systems, and other industrial networks. The drive is optimized for controlling **three-phase asynchronous motors** (from 0.37 kW to 110 kW, depending on the model variant) with a wide range of speed and torque control capabilities, making it ideal for applications such as conveyor systems, pumps, fans, compressors, and machine tools where variable speed regulation is essential.

One of the standout features of the **6AT1120-0EA00-0AA0** is its **compact yet robust design**, which incorporates a **fan-cooled or air-cooled** configuration (depending on the specific model variant) to ensure efficient heat dissipation even under continuous heavy loads. The drive is equipped with **Siemens advanced digital signal processing (DSP)** and **vector control algorithms**, enabling precise torque and speed regulation with minimal overshoot, reduced mechanical stress on connected equipment, and improved energy efficiency often resulting in **energy savings of up to 50%** compared to traditional constant-speed motor drives. Additionally, the unit supports **regenerative braking**, allowing for energy recovery in applications where deceleration is frequent, further enhancing overall system efficiency.

Safety and reliability are prioritized in the design of this drive, with built-in **overcurrent, overvoltage, undervoltage, and overtemperature protection**, as well as **short-circuit and phase loss detection** to prevent damage to both the drive and the connected motor. The **6AT1120-0EA00-0AA0** also features **Siemens SIMATIC S7-1200/1500 integration**, enabling seamless programming via **TIA Portal**, where users can configure parameters, monitor performance, and implement advanced control strategies with ease. The drive s **user-friendly interface**, including an **integrated LCD display and keypad**, allows for on-site adjustments, diagnostics, and troubleshooting without requiring external tools, reducing downtime and maintenance complexity.

For applications requiring **high-precision motion control**, the **6AT1120-0EA00-0AA0** supports **positioning modes**, including **open-loop and closed-loop control**, making it suitable for applications such as robotic systems, CNC machines, and automated material handling. The drive s **modular input/output (I/O) options** including **analog, digital, and fieldbus interfaces** further enhance its adaptability, allowing it to interface with a wide range of sensors, encoders, and external control systems. Whether deployed in **discrete manufacturing, process industries, or energy-efficient building automation**, this Siemens VFD delivers **superior performance, long-term cost savings, and seamless integration** into existing or new automation infrastructures.

In summary, the **Siemens 6AT1120-0EA00-0AA0 (6AT11200EA000AA0)** is a **highly versatile, energy-efficient, and robust AC drive** that excels in applications requiring **precise motor control, energy savings, and reliable operation**. Its advanced features, seamless integration with Siemens automation ecosystem, and robust protection mechanisms make it a **preferred choice** for industries seeking **cutting-edge drive technology** that balances performance, efficiency, and maintainability.

### **Analysis of Siemens 6AT1120-0EA00-0AA0 (and 6AT11200EA000AA0) Motor Starter**

The **Siemens 6AT1120-0EA00-0AA0** (and its variant **6AT11200EA000AA0**) is a **star-delta starter** designed for controlling three-phase induction motors. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Reliability and Durability**

- Siemens is a well-established brand known for high-quality industrial automation components. These starters are built to withstand harsh environments and prolonged use, reducing the likelihood of frequent failures.

- Robust construction with proper insulation and mechanical protection against dust, moisture, and temperature fluctuations.

2. **Energy Efficiency**

- Star-delta starting reduces inrush current by up to **30-50%** compared to direct-on-line (DOL) starting, extending the lifespan of the motor and reducing electrical stress on the system.

- Lower starting current helps prevent voltage dips in industrial settings with multiple motors.

3. **Smooth Motor Startup**

- The star-delta configuration provides a gentler startup, reducing mechanical stress on belts, gears, and connected equipment.

- Suitable for applications where sudden high torque (e.g., pumps, fans, compressors) could cause damage.

4. **Compatibility with Siemens Systems**

- Designed to integrate seamlessly with other Siemens components (e.g., PLCs, relays, and motor control systems), simplifying automation and control setups.

- Supports standard Siemens wiring and programming conventions, reducing compatibility issues.

5. **Maintenance-Friendly**

- Modular design allows for easier replacement of worn-out components (e.g., contactors, thermal overload relays).

- Clear labeling and accessible terminals simplify troubleshooting and maintenance.

6. **Wide Voltage and Current Ratings**

- Suitable for a broad range of motor sizes (typically **0.75 kW to 110 kW** depending on the variant), making it versatile for various industrial applications.

- Available in different current ratings (e.g., 6A, 10A, 16A, etc.), allowing selection based on specific motor requirements.

7. **Safety Features**

- Built-in thermal overload protection prevents motor overheating due to faults like stalled rotation or overload.

- Can be equipped with auxiliary contacts for additional safety interlocks (e.g., emergency stop integration).

8. **Cost-Effective for Medium-Duty Applications**

- More affordable than soft starters or variable frequency drives (VFDs) for applications where precise speed control is unnecessary.

- Lower initial cost compared to advanced motor control solutions.

---

### **Cons**

1. **Limited Speed Control**

- Star-delta starters only provide **two-speed operation** (start in star, then switch to delta for full speed). They do not offer variable speed control, which may be a limitation for applications requiring adjustable motor speeds (e.g., conveyor systems, HVAC with variable airflow needs).

- For precise speed control, a **VFD (Variable Frequency Drive)** would be required, increasing system complexity and cost.

2. **Higher Inrush Current Than VFDs**

- While star-delta reduces inrush current compared to DOL, it is still higher than what a VFD provides. This can cause temporary voltage drops in systems with weak grids or multiple motors starting simultaneously.

- May require additional capacitors or grid stabilization measures in sensitive applications.

3. **Mechanical Wear During Switching**

- The physical switching between star and delta configurations can introduce **transient torque spikes**, which may stress mechanical components (e.g., belts, couplings) over time.

- Not ideal for applications with high starting torque requirements or frequent starts/stops.

4. **Size and Installation Space**

- Bulkier than electronic alternatives like VFDs or solid-state relays. Requires adequate panel space and proper ventilation to prevent overheating.

- May not be suitable for compact or retrofitted systems where space is limited.

5. **Dependence on Electrical Grid Stability**

- Sensitive to voltage fluctuations or harmonics in the power supply. Poor grid quality can lead to erratic operation or premature failure of contactors.

- Unlike VFDs, which can mitigate some grid issues, star-delta starters rely on stable input conditions.

6. **Limited Longevity Compared to Modern Solutions**

- Mechanical contactors (used in star-delta starters) have a finite lifespan due to wear from repeated switching. VFDs or electronic starters (e.g., Siemens Sinamics) offer longer operational lifespans with minimal moving parts.

- Requires periodic inspection and replacement of contactors, increasing maintenance overhead.

7. **Not Ideal for High-Torque or Heavy Load Applications**

- May struggle with motors requiring **high starting torque** (e.g., pumps with blocked discharge, conveyors with heavy loads). In such cases, a **soft starter or VFD** would be more appropriate.

- Can cause **voltage sag** in systems with weak wiring or long cable runs, leading to inconsistent performance.

8. **Single-Speed Operation Limitations**

- Once the motor switches to delta configuration, there is no way to adjust speed further. This restricts flexibility in applications where partial loads or variable speeds are needed.

---

### **Conclusion**

The **Siemens 6AT1120-0EA00-0AA0 (and 6AT11200EA000AA0)** star-delta starter is a **cost-effective, reliable, and energy-efficient solution** for applications requiring **standard two-speed motor control** without the need for variable speed. It excels in environments where **mechanical simplicity, durability, and compatibility with Siemens systems** are priorities, such as:

- **Pumps and fans** (e.g., water pumps, HVAC systems).

- **Conveyor belts** (with moderate load requirements).

- **Industrial machinery** where sudden high torque is not a concern.

- **Variable speed control** (requires a VFD).

- **High starting torque or frequent starts/stops** (may need a soft starter or VFD).

- **Precision speed or torque regulation** (e.g., robotics, CNC machines).

- **Compact or space-constrained installations** (VFDs or electronic starters may be better).

For **modern industrial setups** where energy efficiency, flexibility, and reduced mechanical stress are critical, **VFDs (e.g., Siemens Sinamics G120)** or **electronic starters** may be preferable despite their higher upfront cost. Conversely, the Siemens 6AT1120 series remains a **practical and proven choice** for traditional star-delta applications.

---

### **Recommendation**

- You need a **simple, reliable, and cost-effective** solution for standard star-delta starting.

- Your application involves **pumps, fans, or conveyors** with moderate load requirements.

- You are working within a **Siemens ecosystem** and require seamless integration.

- Budget constraints prevent the use of more advanced motor control solutions.

- You require **variable speed control** or **precise torque regulation**.

- Your motors experience **high starting torque or frequent cycling**.

- The application involves **sensitive equipment** where mechanical stress from switching is a concern.

- You operate in a **highly automated or energy-efficient** environment where VFDs offer long-term savings.

- Evaluate **Siemens Sinamics G120 VFD** or **electronic starters** if budget allows, as they provide **better energy savings, smoother operation, and longer lifespan**.

- If sticking with star-delta, ensure the **motor and wiring are appropriately sized** to handle the transient currents and torque spikes.

- Regularly inspect **contactors and thermal overload relays** for wear and replace as needed.

- Ensure proper **ventilation and cooling** to prevent overheating in enclosed spaces.

- Consider adding **surge protection** if operating in environments with poor power quality.

In summary, the Siemens 6AT1120 series is a **solid, traditional solution** for its intended purpose but may not be the best long-term investment for applications requiring advanced motor control. Assess your specific needs carefully before purchasing.

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. Sells new and surplus product develops channels to purchase such. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. Call to use a shipping service other than the ones listed.

part #: 6at11200ea000aa0 price

• $1070.65

specifications automationjack:

• brand: Siemens
• mpn: 6at1120-0ea00-0aa0

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• condition: Used

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• started: March 31, 2026
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