Siemens 3RT6027-1AG20 3RT60 Series High Voltage Power Contactor 110VAC 32A 3NO

The Siemens 3RT6027-1AG20, part of the robust 3RT60 series, is a high-voltage power contactor engineered for demanding industrial applications. This 110VAC, 32A, 3-pole contactor provides reliable switching for motor control and other power circuits. Its core advantages lie in its Siemens SIRIUS lineage, offering high reliability and long service life, suitable for frequent switching operations. Key technical parameters include a 600V rating, 32A continuous current capacity, and a 15kW power rating at 400V.

Product Specifications

| Feature             | Specification                                    |

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

| Manufacturer        | Siemens                                          |

| Series              | SIRIUS 3RT60 / 3RT2                              |

| Part Number         | 3RT6027-1AG20                                    |

| Type                | High Voltage Power Contactor                     |

| Number of Poles     | 3-Pole                                           |

| Coil Voltage        | 110 VAC                                          |

| Current Rating      | 32 A                                             |

| Max Voltage Rating  | 600 V                                            |

| Power Rating (AC-3) | 15 kW at 400 V                                   |

| Auxiliary Contacts  | 1 Normally Open (NO) + 1 Normally Closed (NC)    |

| Terminal Type       | Screw Terminal                                   |

| Size                | S0                                               |

| Mounting            | DIN Rail, Screw Mount                            |

| Operating Temperature | -25 °C to +60 °C                                 |

| Mechanical Life     | 10,000,000 switching cycles                      |

| IP Rating           | IP20                                             |

Core Features & Market Positioning

The Siemens 3RT6027-1AG20 stands out in the industrial automation market due to its integration into the well-established SIRIUS system. This positioning ensures compatibility with a vast array of Siemens control and protection devices, simplifying system design and enhancing overall operational efficiency. The contactor's design prioritizes high contact reliability and a substantial mechanical service life of up to 10 million switching cycles, making it a durable and dependable component for continuous operation. Its suitability for climate-resistant operation and approval for worldwide use, including IEC and UL/CSA standards, further solidify its market presence as a robust, globally accepted solution.

Key Application Scenarios

This Siemens contactor is ideally suited for controlling three-phase motors across various industrial sectors. Common applications include pump systems, conveyor belts, ventilation systems, and general machinery control where precise and reliable power switching is paramount. Its 32A rating and 15kW capacity at 400V make it a versatile choice for medium-duty motor loads. The integrated auxiliary contacts (1 NO + 1 NC) provide essential signaling capabilities for control circuits, enabling feedback on the contactor's operational status for integration into PLC-based automation systems.

Practical System Integration Guidance

Integrating the Siemens 3RT6027-1AG20 into existing control systems is streamlined by its design. The screw terminals offer secure connections, and its S0 size allows for mounting on standard 35mm DIN rails, a common standard in industrial control panels. For applications requiring electronic circuit control with low voltages and currents (e.g., ≤ 110 V and ≤ 100 mA), the use of its dedicated auxiliary contacts is recommended to ensure optimal contact stability, capable of handling currents as low as 1 mA at 17 V. The contactor's compatibility with other SIRIUS components, such as overload relays and link modules, further simplifies wiring and reduces installation complexity, contributing to faster commissioning.

Operation and Risk Mitigation

Safe operation of the Siemens 3RT6027-1AG20 requires adherence to electrical safety standards. The contactor is designed to be touch-proof according to DIN VDE 0106 Part 100, enhancing personnel safety. Proper wiring, ensuring correct coil voltage (110 VAC), and correct termination of power conductors are critical to prevent operational failures or hazards. Users should consult the product's datasheet for detailed information on power loss and environmental operating conditions. While specific fault codes are not commonly listed for basic contactors, operational issues typically stem from incorrect wiring, coil failure, or contact wear over extended use. Regular inspection and maintenance are key to mitigating risks.

Scalability & Long-Term Value

The Siemens 3RT6027-1AG20 offers significant long-term value through its integration with the broader Siemens SIRIUS ecosystem. This allows for easy scalability; for instance, additional auxiliary switch blocks can be added to expand signaling capabilities, and it pairs seamlessly with various thermal and solid-state overload relays for comprehensive motor protection. Its IE3/IE4-ready status indicates its suitability for modern, energy-efficient motor drives, ensuring continued relevance in evolving industrial automation landscapes. The availability of accessories and compatibility with communication modules further enhances its potential for integration into IIoT and digital manufacturing solutions.

Frequently Asked Questions (FAQs)

Q1: What is the primary function of the Siemens 3RT6027-1AG20 contactor?

This high-voltage power contactor serves as an electrically operated switch. It is designed to initiate or break the flow of current in a power circuit, typically for controlling electric motors. Its robust construction allows for frequent and reliable switching operations in industrial settings.

The Siemens 3RT6027-1AG20 is part of the SIRIUS 3RT60 series, known for its durability and performance. It's rated for 32A and operates with a 110VAC coil, making it suitable for a wide range of motor control applications.

Its core application is in motor starters, acting as the main switching element that connects or disconnects the motor from the power supply based on control signals.

Q2: What are the main technical specifications of the Siemens 3RT6027-1AG20?

The Siemens 3RT6027-1AG20 is a 3-pole contactor with a 110 VAC coil voltage and a 32A current rating. It is designed for a maximum system voltage of 600V and can handle a power output of 15 kW at 400V.

It features 1 normally open (NO) and 1 normally closed (NC) auxiliary contact for control circuit feedback. The contactor is size S0 and utilizes screw terminals for secure connections.

This unit is built for industrial environments, offering a mechanical service life of up to 10 million switching cycles and operating within a temperature range of -25°C to +60°C.

Q3: In which industrial applications is the 3RT6027-1AG20 commonly used?

This Siemens contactor is widely deployed for controlling three-phase electric motors in various industrial machinery. Common uses include pump systems, fans, compressors, and conveyor belts.

Its robust design makes it suitable for applications requiring frequent starting and stopping of motors. The 32A rating allows it to handle significant motor loads efficiently and reliably.

The 3RT6027-1AG20 is a key component in motor control centers (MCCs) and control panels, ensuring safe and effective power management for industrial equipment.

Q4: What does the "3NO" in the Siemens 3RT6027-1AG20 refer to?

The "3NO" in the product name or description typically refers to the main power contacts. In this case, it indicates that the contactor is equipped with three normally open (NO) main poles.

These three NO poles are used to switch the three phases of a three-phase power supply to a motor or other equipment. When the coil is energized, these contacts close, allowing current to flow.

While the main contacts are typically described by their pole count (e.g., 3-pole), the "3NO" specification emphasizes their default open state before activation.

Q5: How is the Siemens 3RT6027-1AG20 installed and wired?

Installation is typically done via a 35mm DIN rail mount or direct screw mounting in control panels. The contactor features screw terminals for secure electrical connections.

For wiring, the 110 VAC coil requires connection to the appropriate control voltage source. The main power terminals (L1, L2, L3 and T1, T2, T3) are connected in series with the load, such as a motor.

The auxiliary contacts (1 NO, 1 NC) are wired into the control circuit for feedback signals, interlocking, or status indication to control systems like PLCs.

Q6: Can the Siemens 3RT6027-1AG20 be used with different coil voltages?

The specific model 3RT6027-1AG20 is designed with a 110 VAC coil voltage. While Siemens offers other contactors in the SIRIUS series with different coil voltages (e.g., 24V, 230V), this particular unit is optimized for 110V AC control circuits.

Using the wrong coil voltage can lead to improper operation or damage to the contactor. Always verify the coil voltage rating against the available control power supply before installation.

If a different coil voltage is required, you would need to select a different Siemens contactor model that matches the desired control voltage specification.

Q7: What are the advantages of using the Siemens SIRIUS 3RT60 series contactors?

The SIRIUS 3RT60 series offers high reliability and durability, ensuring long operational life even in demanding environments. They are designed for efficient motor control and power switching.

These contactors integrate seamlessly with other Siemens SIRIUS components, simplifying system design and reducing wiring complexity. Accessories like auxiliary contacts and overload relays are readily available.

They are built to meet global standards (IEC, UL/CSA) and are climate-resistant, making them suitable for worldwide applications and ensuring dependable performance.

Q8: How do I troubleshoot common issues with the 3RT6027-1AG20?

Common issues can arise from incorrect wiring, a faulty coil, or worn-out contacts. Ensure the coil voltage is correct and that all power and control wiring is securely connected.

If the contactor fails to engage, check the control signal to the coil and verify continuity of the coil itself. If it engages but doesn't pass power, inspect the main power contacts for signs of burning or damage.

Regular visual inspection for any physical damage or excessive wear is recommended. For persistent issues, consult the Siemens technical documentation or contact customer support.

Q9: Is the Siemens 3RT6027-1AG20 compatible with PLC systems?

Yes, the Siemens 3RT6027-1AG20 is highly compatible with PLC (Programmable Logic Controller) systems. Its integrated auxiliary contacts (1 NO, 1 NC) provide crucial feedback signals to the PLC, indicating the contactor's state (energized or de-energized).

These auxiliary contacts can be wired to PLC input modules, allowing the PLC to monitor the status of the motor or power circuit. This enables sophisticated control logic, safety interlocks, and system diagnostics.

The standard 110V AC coil voltage is commonly used in industrial control circuits that interface with PLCs, facilitating straightforward integration.

Q10: What is the typical lifespan or mechanical life of this contactor?

The Siemens 3RT6027-1AG20 boasts a significant mechanical service life of up to 10 million switching cycles under typical operating conditions. This indicates a robust design intended for long-term industrial use.

The electrical life, however, can vary depending on the load being switched, the frequency of switching, and environmental factors. For critical applications or high switching rates, it's advisable to consult Siemens' application guidelines.

Regular maintenance and proper application within its rated parameters will help ensure the contactor achieves its maximum intended lifespan.