Siemens 3RT6028-1AN20 3RT60 Coil Standard Contactor 220VAC 38A 3NO

The Siemens 3RT6028-1AN20 3RT60 coil standard contactor is a robust 220VAC, 38A, 3NO (normally open) device engineered for reliable power switching in demanding industrial environments. Its core advantages lie in its proven Siemens quality, compact design, and efficient electrical performance, making it a preferred choice for motor control, lighting, and general power distribution applications. This contactor offers superior durability and consistent operation, ensuring minimal downtime and optimized system efficiency.

Siemens 3RT6028-1AN20: Product Specifications

| Feature                   | Specification                     |

| :------------------------ | :-------------------------------- |

| Product Type              | Standard Contactor                |

| Manufacturer              | Siemens                             |

| Series                    | 3RT60                             |

| Coil Voltage              | 220VAC                            |

| Rated Operational Current | 38A                               |

| Number of NO Contacts     | 3                                 |

| Auxiliary Contacts        | Typically requires separate blocks |

| Mounting Type             | DIN rail or screw mounting        |

| Protection Rating         | Varies by enclosure/application   |

| Dimensions (H x W x D)    | Approx. 90mm x 55mm x 100mm       |

| Standards Compliance      | IEC 60947-4-1                     |

Core Features & Market Positioning

The Siemens 3RT6028-1AN20 stands out in the market due to its exceptional reliability, a hallmark of Siemens industrial automation components. Its solid-state coil technology (when applicable for specific variants, though this model specifies AC coil) ensures consistent activation and reduced wear compared to older electromagnetic designs. This contactor is positioned as a cost-effective yet high-performance solution for general-purpose switching tasks, competing effectively with other leading brands by offering a balance of durability, ease of integration, and long operational life. Its straightforward design minimizes potential failure points, contributing to its reputation for robust performance in diverse industrial settings.

Key Application Scenarios

This Siemens contactor is ideally suited for a wide array of industrial applications, primarily focusing on motor control for pumps, fans, conveyors, and HVAC systems. Its 38A rating makes it capable of handling significant loads, while the 3NO configuration is standard for three-phase motor starting and stopping. Beyond motor control, the 3RT6028-1AN20 is frequently employed in building automation for controlling lighting circuits, heating elements, and other power loads within commercial and industrial facilities. Its versatility extends to power distribution panels and control cabinets where reliable on/off switching of circuits is paramount.

Practical System Integration Guidance

Integrating the Siemens 3RT6028-1AN20 into an existing control system is straightforward due to its standard mounting options and clear terminal markings. For DIN rail mounting, simply slide the contactor onto the rail and secure it. Screw mounting requires using appropriate M4 screws for fixed installation. Wiring involves connecting the power terminals (L1, L2, L3 and T1, T2, T3) to the load and supply, ensuring correct phase sequencing for motor applications. The 220VAC coil is connected to terminals A1 and A2. It's crucial to ensure the control voltage supply matches the coil specification precisely to prevent damage. For more complex circuits, auxiliary contact blocks can be easily snapped onto the front of the contactor to provide additional signaling contacts for interlocking or status feedback. Always consult the official Siemens wiring diagrams for specific application configurations.

Operation and Risk Mitigation

The 3RT6028-1AN20 operates by energizing its coil, which creates a magnetic field that pulls in an armature, closing the main power contacts. When the coil is de-energized, a spring returns the armature, opening the contacts. Safe operation requires adherence to proper installation procedures, including correct wiring and ensuring the contactor is rated for the intended load. Risks include overload conditions, short circuits, and incorrect coil voltage. To mitigate these, always use appropriate overcurrent protection devices (fuses or circuit breakers) upstream of the contactor. Regularly inspect terminals for signs of wear or overheating, and verify that the control voltage remains within the specified 220VAC tolerance. Failure to do so can lead to premature contact wear, coil burnout, or electrical hazards.

Scalability & Long-Term Value

The Siemens 3RT6028-1AN20 offers excellent long-term value through its inherent durability and compatibility with broader Siemens automation ecosystems. While this specific contactor is a standalone component, its integration into larger systems can be scaled by employing multiple units for complex machine controls or by combining it with other Siemens devices like overload relays (e.g., 3RU series) for comprehensive motor protection. Its modular design, allowing for the addition of auxiliary contacts, also provides a degree of flexibility. For future-proofing, these contactors seamlessly integrate into distributed control architectures, and their reliable performance contributes to overall system uptime, a critical factor in industrial efficiency and reduced total cost of ownership.

Frequently Asked Questions

What is the primary function of the Siemens 3RT6028-1AN20?

The Siemens 3RT6028-1AN20 is a standard industrial contactor. It functions as an electrically operated switch. Its main purpose is to safely connect or disconnect electrical power to a load, typically a motor.

It handles significant current loads, up to 38A. The 220VAC coil voltage dictates how it is controlled by the automation system. It has three normally open (NO) contacts for power switching.

This makes it ideal for starting and stopping three-phase machinery and other power-intensive equipment in manufacturing and building automation.

How do I properly wire the Siemens 3RT6028-1AN20 contactor?

Wiring involves connecting the power source to the main terminals (L1, L2, L3) and the load to the output terminals (T1, T2, T3). The coil is energized via terminals A1 and A2 using the 220VAC control supply.

Ensure correct phase rotation for motor applications to prevent damage and ensure proper operation. Always verify that the control voltage precisely matches the 220VAC rating to avoid coil failure.

For safety and complex logic, auxiliary contact blocks can be added. These provide additional contacts for signaling or interlocking functions.

What types of loads can the Siemens 3RT6028-1AN20 handle?

This contactor is rated for 38A, making it suitable for a wide range of industrial loads. Its primary use is for controlling electric motors, especially three-phase motors commonly found in pumps, fans, and conveyor systems.

It can also be used for switching resistive loads like heating elements or lighting circuits. However, for inductive loads like transformers or fluorescent ballasts, derating might be necessary depending on the inrush current.

Always consult the product datasheet and relevant IEC standards for specific load type ratings and application guidelines to ensure safe and reliable operation.