Siemens 3RT7025-1AN20 Universal Standard Control Contactor 200VAC 18A 3NO

The Siemens 3RT7025-1AN20 Universal Standard Control Contactor is a robust and reliable component designed for demanding industrial control applications. This 200VAC, 18A contactor boasts three normally open (NO) poles, offering straightforward and efficient power switching. Its core advantages lie in its compact design, high switching capacity, and dependable Siemens quality, making it a preferred choice for machine builders and system integrators seeking a dependable solution for motor control and general switching tasks. Key technical parameters include a rated operational voltage of 200VAC, a rated operational current of 18A, and a coil voltage of 200VAC, ensuring compatibility with standard industrial power supplies.

Product Specifications

| Feature                 | Specification                      |

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

| Product Type            | Universal Standard Control Contactor |

| Model Number            | 3RT7025-1AN20                      |

| Rated Operational Voltage | 200VAC                             |

| Rated Operational Current | 18A                                |

| Number of Poles         | 3 NO (Normally Open)               |

| Coil Voltage            | 200VAC                             |

| Terminal Type           | Screw Terminal                     |

| Protection Class        | IP20                               |

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

| Standards Compliance    | IEC, UL, CSA                       |

Core Features & Market Positioning

The Siemens 3RT7025-1AN20 stands out in the competitive industrial control market due to its inherent reliability and ease of integration. Its design emphasizes a compact footprint, crucial for control panel efficiency, while maintaining a high switching capacity for its size, allowing it to handle significant loads. Siemens' reputation for quality manufacturing ensures a long operational lifespan, reducing maintenance costs and downtime for end-users. This contactor is positioned as a versatile, no-nonsense solution for a wide array of basic to intermediate control tasks, fitting seamlessly into both new installations and retrofits where space and performance are key considerations.

Key Application Scenarios

This universal control contactor is ideally suited for a variety of industrial applications where reliable switching of electrical loads is paramount. Common scenarios include direct-on-line starting of three-phase motors up to 18A, control of heating circuits, and general-purpose switching in automation systems. It finds extensive use in manufacturing plants, building automation, and material handling systems. The 3RT7025-1AN20 is particularly valuable in applications requiring a compact, yet powerful switching device that can withstand the rigors of continuous industrial operation.

Practical System Integration Guidance

Integrating the Siemens 3RT7025-1AN20 into existing or new control systems is straightforward, largely due to its standard terminal configurations and clear internal design. The screw terminals provide a secure and reliable connection point for power and control wiring. For motor control applications, it is typically wired in series with the motor and controlled by a separate control circuit, often initiated by a push-button or PLC output. Proper wiring ensures the correct connection of incoming power to the line terminals and outgoing power to the load terminals. Ensuring correct coil voltage matching (200VAC in this case) is critical for proper actuation.

Operation and Risk Mitigation

Safe and effective operation of the Siemens 3RT7025-1AN20 relies on adherence to electrical safety standards and proper installation practices. Users should always ensure the power supply is de-energized before performing any wiring or maintenance. The contactor's IP20 protection class indicates it is suitable for use within enclosures, protecting against direct contact with live parts. Overloading beyond its 18A rating is a primary risk that can lead to premature failure or hazardous conditions; therefore, appropriate overload protection, such as thermal overload relays, should always be specified and integrated into the control circuit.

Scalability & Long-Term Value

The Siemens 3RT7025-1AN20 offers excellent long-term value and scalability within the broader Siemens industrial automation ecosystem. While this specific model is designed for core switching functions, its compatibility with other Siemens control and protection devices, such as overload relays and circuit breakers, allows for the creation of comprehensive and scalable motor control centers. For systems requiring advanced diagnostics or integration into IIoT platforms, this contactor can be part of a larger solution where intelligent control modules are added to monitor its status and operational parameters, providing a pathway to digital transformation without replacing the core switching component.

Frequently Asked Questions

What is the primary function of the Siemens 3RT7025-1AN20?

The Siemens 3RT7025-1AN20 is an industrial control contactor. It acts as a heavy-duty electrical switch for controlling motors and other electrical loads. Its primary role is to safely make and break power circuits.

Its robust design allows it to handle significant current and voltage for frequent switching operations. This makes it ideal for automation and power control applications in various industries.

This specific model is rated for 18A at 200VAC and features three normally open poles. This configuration is standard for switching three-phase power to motors.

What type of loads can the 3RT7025-1AN20 control?

This contactor is primarily designed for controlling inductive loads like three-phase induction motors. It can also manage resistive loads such as heating elements.

Its 18A rating defines the maximum continuous current it can safely switch. Exceeding this limit can cause overheating and premature failure of the contactor.

It's crucial to consider the motor's starting current, which is higher than its running current, when selecting an appropriately sized contactor. Ensure the contactor is correctly specified for the motor's power rating.

How do I wire the Siemens 3RT7025-1AN20 for motor control?

For motor control, the main power terminals (L1, L2, L3) of the contactor are connected to the incoming power supply. The load terminals (T1, T2, T3) are then connected to the motor.

The coil terminals (A1, A2) are connected to the control circuit. This circuit, typically low voltage, energizes the coil to close the main contacts and supply power to the motor.

Always follow local electrical codes and ensure the power is off before wiring. Use appropriately sized conductors and ensure all connections are secure.

What does the 200VAC rating signify for this contactor?

The 200VAC rating indicates the voltage at which the contactor is designed to operate. This refers to both the power circuit it switches and the coil voltage that energizes it.

This means the main contacts can handle up to 200 volts AC when switching loads. The coil also requires a 200-volt AC supply to activate and close the contacts.

When selecting and installing, ensure your system's power supply and control voltage match this specification precisely. Using incorrect voltages can lead to malfunction or damage.

Can this contactor be used with PLC control systems?

Yes, the Siemens 3RT7025-1AN20 is well-suited for integration with PLC (Programmable Logic Controller) systems. The contactor's coil is typically controlled by an output module from the PLC.

The PLC's digital output signal energizes or de-energizes the contactor's coil, thereby switching the higher power load connected to the main contacts. This allows for automated control.

Ensure the PLC output module's voltage and current ratings are compatible with the contactor's coil requirements. Proper interfacing, potentially with a relay or optocoupler, might be necessary depending on the PLC specifications.

What are the advantages of using a Siemens contactor like the 3RT7025-1AN20?

Siemens contactors are known for their high reliability and long operational life, even under demanding industrial conditions. This minimizes downtime and maintenance costs.

They offer excellent switching performance and durability, adhering to stringent international standards. Their compact design also saves valuable space in control panels.

The brand's reputation ensures consistent quality and readily available support and documentation, making them a trusted choice for critical applications.

How do I protect the motor controlled by this contactor?

Motor protection is typically achieved using a separate overload relay, often mounted directly onto the contactor or wired in series with the control circuit. This relay monitors motor current.

If the motor current exceeds a set threshold for a sustained period, indicating an overload or phase loss, the overload relay trips and opens its auxiliary contact. This breaks the contactor coil circuit, de-energizing the contactor and stopping the motor.

Selecting the correct overload relay size and type is crucial. It should be matched to the motor's full load current and protection requirements as specified by the motor manufacturer.

What is the significance of "3NO" in the product description?

"3NO" stands for "three Normally Open" contacts. This means that in its default, un-energized state, all three main contacts are open, preventing current flow.

When the contactor's coil is energized (with 200VAC), these three contacts close simultaneously. This action completes the power circuit to the connected load, such as a three-phase motor.

This configuration is standard for switching a three-phase motor on, as all three phases require to be connected to the motor for it to operate correctly.

What ambient temperature range is suitable for operating this contactor?

The Siemens 3RT7025-1AN20 is designed to operate reliably within an ambient temperature range of -25 to +60 degrees Celsius. This covers a wide spectrum of industrial environments.

Operating outside this specified temperature range can affect the performance and lifespan of the contactor. Extreme cold might impact mechanical operation, while extreme heat can degrade insulation and components.

Ensure adequate ventilation within the control panel, especially if multiple contactors or other heat-generating components are present, to maintain the ambient temperature within the recommended limits.

Where can I find the official datasheet or manual for the Siemens 3RT7025-1AN20?

Official datasheets and technical manuals for Siemens products are typically available on the Siemens Industry Online Support (SIOS) portal. You can search for the product number (3RT7025-1AN20) on their website.

These documents provide comprehensive details on specifications, dimensions, wiring diagrams, application guidelines, and safety information. They are essential resources for proper installation and operation.

Downloading the latest version of the datasheet is recommended to ensure you have the most up-to-date technical information for your specific application needs.