Siemens 3RT6027-1AQ00 Industrial Application Standard Contactor 380VAC 32A 3NO

The Siemens 3RT6027-1AQ00 is a robust, 3-pole standard industrial application contactor designed for reliable power switching in demanding environments. This contactor boasts a 32A rated current and a 380VAC coil voltage, making it suitable for a wide range of motor control and power distribution applications. Key advantages include its high contact reliability, long operational lifespan, and compact design, which facilitates high packing density in control cabinets. The 3RT6027-1AQ00 features 1 normally open (NO) and 1 normally closed (NC) auxiliary contact, providing essential signaling capabilities for control circuits. Its AC3 rating of 15 kW at 400V highlights its suitability for motor starting duties. The product is actively manufactured and considered a standard item within Siemens' extensive SIRIUS industrial control and protection portfolio.

Product Specifications

| Feature              | Specification                                    |

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

| Manufacturer         | Siemens                                          |

| Series               | SIRIUS 3RT6                                      |

| Product Type         | Standard Application Contactor                   |

| Number of Poles      | 3-pole                                           |

| Rated Current (AC3)  | 32A                                              |

| Coil Voltage         | 380VAC                                           |

| Frequency            | 50/60 Hz                                         |

| Power Rating (AC3)   | 15 kW at 400V                                    |

| Auxiliary Contacts   | 1 NO + 1 NC                                      |

| Terminal Type        | Screw terminal                                   |

| Contactor Size       | S0                                               |

| Packaging Dimensions | 90.00 x 105.00 x 55.00 mm                        |

| Net Weight           | 0.390 Kg                                         |

| Product Lifecycle    | Active Product                                   |

| Product Class        | A: Standard product (stock item)                 |

| RoHS Compliance      | Yes (since 2012/05/01)                           |

| Country of Origin    | China                                            |

Core Features & Market Positioning

The Siemens 3RT6027-1AQ00 stands out in the industrial contactor market due to its inherent reliability and suitability for diverse applications within the SIRIUS modular system. Its design prioritizes long-term operational stability and ease of integration. The contactor's rugged construction ensures it performs consistently even under challenging environmental conditions. Siemens positions the 3RT6027-1AQ00 as a dependable, general-purpose solution for motor control and power switching, leveraging the broad compatibility and extensive accessory range of the SIRIUS platform. This allows for customized solutions and future expandability, a critical factor for industrial automation where systems evolve. The availability of integrated auxiliary contacts (1 NO + 1 NC) simplifies control circuit wiring and provides essential feedback for automation systems.

Key Application Scenarios

The Siemens 3RT6027-1AQ00 finds its primary application in the switching and control of three-phase AC motors, particularly in the industrial sector. Its 32A rating and 15 kW power capability at 400V make it well-suited for direct-on-line (DOL) starting of medium-sized motors used in pumps, fans, compressors, and conveyor systems. Beyond motor control, this contactor is also utilized in power distribution circuits for loads that require robust switching, such as heating elements or lighting systems, where its AC3 utilization category is applicable. The 1 NO + 1 NC auxiliary contacts are crucial for interlock circuits, status signaling to PLCs, and integration into safety control systems, ensuring operational integrity.

Practical System Integration Guidance

Integrating the Siemens 3RT6027-1AQ00 into an industrial control system is straightforward due to its standard S0 size and screw terminal connections. For wiring the main circuit, ensure that the incoming power supply is connected to the top terminals and the load (motor) is connected to the bottom terminals, respecting the phase sequence for three-phase motors. The coil voltage of 380VAC must be correctly supplied to terminals A1 and A2 to energize the contactor. The auxiliary contacts (1 NO + 1 NC) can be wired into control logic circuits for signaling or interlocking. It's imperative to consult the specific wiring diagrams provided in the Siemens SIRIUS 3RT system manuals for detailed guidance, especially when integrating with overload relays (like SIRIUS 3RB series) or other control components to ensure proper short-circuit protection and system functionality. Adherence to national installation specifications and standards is mandatory during installation.

Operation and Risk Mitigation

Proper operation of the Siemens 3RT6027-1AQ00 requires adherence to specified environmental conditions and electrical parameters. The contactor is designed for operation within specific ambient temperature ranges and humidity levels. Risk mitigation primarily involves correct installation, including appropriate wiring and secure connections, to prevent overheating and electrical faults. Overload protection should always be implemented in conjunction with the contactor, typically via a separate overload relay, to protect connected motors from damage due to overcurrent. Finger-safe features, as per EN 50274, enhance operational safety, though always exercise caution when working with live electrical equipment. In case of operational issues, visual inspection for signs of wear or damage, and checking control voltage supply are initial troubleshooting steps. Referencing the product's technical documentation or a qualified service technician is recommended for complex faults.

Scalability & Long-Term Value

The Siemens 3RT6027-1AQ00 offers significant long-term value through its integration within the broader SIRIUS ecosystem, facilitating scalability and future-proofing of automation systems. As a standard product, it is readily available and compatible with a wide array of SIRIUS accessories, including auxiliary switch blocks, surge suppressors, and communication modules, allowing for functional expansion without replacing the base contactor. This modular approach enables system upgrades or modifications to accommodate changing production demands or integration with Industry 4.0 initiatives, such as IIoT (Industrial Internet of Things) solutions, often through intelligent link modules. The robust design and high-quality Siemens manufacturing ensure a long mechanical and electrical service life, minimizing downtime and replacement costs over the system's operational period.

Frequently Asked Questions

What is the primary function of the Siemens 3RT6027-1AQ00 contactor?

The Siemens 3RT6027-1AQ00 is primarily used for switching and controlling electric motors in industrial applications. It acts as a remote-controlled switch, allowing for safe and efficient operation of machinery.

Its 32A rating and 15kW power capability at 400V are suitable for direct-on-line starting of many common industrial motors. The contactor ensures reliable connection and disconnection of power supply to the motor.

This device is a key component in motor control circuits, often used in conjunction with overload relays for comprehensive protection. It can also be used for switching other types of industrial loads.

What is the coil voltage for the Siemens 3RT6027-1AQ00?

The Siemens 3RT6027-1AQ00 contactor is specified with a coil voltage of 380VAC. This is the voltage required to energize the coil and close the main power contacts.

It is crucial to supply the correct voltage to the A1 and A2 terminals of the contactor for its proper operation. Incorrect coil voltage can lead to malfunction or damage.

While the product is rated for 380VAC, some Siemens contactors in the SIRIUS range offer multi-voltage coils covering a wider range, but this specific model is designed for 380VAC.

Can the Siemens 3RT6027-1AQ00 be used for DC applications?

No, the Siemens 3RT6027-1AQ00 is an AC contactor and is not designed for DC applications. Its specifications, including the 380VAC coil voltage and AC3 power rating, are specific to alternating current.

Using this AC contactor in a DC circuit would likely result in improper operation and potential damage due to the different arc quenching characteristics of DC circuits.

For DC applications, Siemens offers specific DC contactors within the SIRIUS range, which are engineered with different contact and coil designs to safely handle direct current.

What type of auxiliary contacts does the 3RT6027-1AQ00 have?

The Siemens 3RT6027-1AQ00 features one normally open (NO) and one normally closed (NC) auxiliary contact. These are typically used for control and signaling purposes.

The NO contact will close when the main contacts are energized, while the NC contact will open. These signals can be used for interlocks, status feedback to a PLC, or alarm functions.

These auxiliary contacts are essential for building complex control circuits and ensuring the overall system operates safely and efficiently according to design logic.

What is the maximum power rating for this contactor?

The Siemens 3RT6027-1AQ00 has a maximum power rating of 15 kW at 400V under AC3 utilization category. This rating is specific to the switching of three-phase squirrel-cage motors.

This means it can reliably switch motors up to this power output during normal operation. For starting duty, it's important to ensure the motor's starting current is within the contactor's capabilities.

It's always recommended to consult the motor's nameplate and relevant motor control standards to ensure the contactor is appropriately sized for the specific application and motor characteristics.

How do I wire the Siemens 3RT6027-1AQ00?

Wiring involves connecting the incoming power to the top terminals and the load (e.g., motor) to the bottom terminals of the main poles. The 380VAC coil voltage is connected to terminals A1 and A2.

The 1 NO and 1 NC auxiliary contacts are wired into the control circuit for signaling or interlocks. Always refer to the official Siemens wiring diagrams for precise connections.

Ensure all connections are secure to prevent loose contacts, overheating, and potential faults. Proper installation following national electrical codes is mandatory.

What is the contactor size of the Siemens 3RT6027-1AQ00?

The Siemens 3RT6027-1AQ00 is classified as a size S0 contactor. This designation indicates its physical dimensions and its corresponding power and current handling capabilities within the SIRIUS 3RT series.

Size S0 contactors are typically used for medium power ratings, fitting into compact control panels. Siemens provides a range of accessories that are compatible with this size.

The S0 size classification helps in selecting appropriate enclosures, mounting hardware, and other complementary devices within the SIRIUS modular system.

Is the Siemens 3RT6027-1AQ00 suitable for frequent switching cycles?

Yes, the Siemens 3RT6027-1AQ00 is designed for industrial applications, which often involve frequent switching. Siemens SIRIUS contactors are known for their high mechanical and electrical endurance.

With a typical mechanical service life of 10 million operating cycles, it can handle a considerable number of actuations over its lifespan. Proper application within its rated electrical limits ensures longevity.

For applications requiring extremely high switching frequencies, specialized contactors or solid-state switching devices might be considered, but this standard contactor offers robust performance for typical industrial motor control duties.

Does this contactor come with overload protection?

No, the Siemens 3RT6027-1AQ00 is a contactor and does not include integrated overload protection. It is designed to work in conjunction with a separate overload relay, such as those from the Siemens SIRIUS 3RB series.

The overload relay monitors motor current and trips the control circuit if an overcurrent condition persists, thereby protecting the motor from thermal damage. The contactor handles the main power switching.

Implementing a proper overload protection system is crucial for the safe and reliable operation of motor-driven machinery and is a standard practice in industrial electrical installations.

What is the warranty period for this Siemens contactor?

While specific warranty terms can vary by distributor, new Siemens 3RT6027-1AQ00 contactors are typically covered by a manufacturer's warranty. Some distributors, like Bommro Automation, offer up to a 1-year warranty on new and original items.

It is essential to check the warranty details provided by the specific supplier at the time of purchase, as terms and duration can differ.

For products purchased through unauthorized channels or second-hand, the manufacturer's warranty may not apply, and any warranty would be offered by the seller. Always purchase from reputable distributors.