Siemens 3RT6025-1BF40 Multi-function 3RT60 Contactor with Accessories 110VDC 17A 3NO

The Siemens 3RT6025-1BF40 is a versatile multi-function contactor designed for robust industrial applications. This 110VDC unit, rated for 17A with three normally open (NO) poles, offers exceptional reliability and control for a wide range of electrical systems. Its integrated accessories and advanced features position it as a key component for modern automation and power control needs, emphasizing efficiency and operational continuity.

Product Specifications

| Feature                     | Specification                             |

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

| Product Type                | Multi-function Contactor                |

| Series                      | 3RT60                                     |

| Model Number                | 3RT6025-1BF40                             |

| Coil Voltage                | 110V DC                                   |

| Rated Operational Current   | 17 A                                      |

| Number of NO Poles          | 3                                         |

| Auxiliary Contacts          | Integrated (Specific configuration varies) |

| Mounting Type               | DIN Rail / Screw                          |

| Protection Class            | IP20 (enclosure)                          |

| Ambient Operating Temp.     | -25°C to +60°C                            |

| Certifications              | CE, UL, CSA                               |

Core Features & Market Positioning

The Siemens 3RT6025-1BF40 stands out in the industrial control market due to its multi-functionality and integrated accessory design. This reduces the need for separate components, simplifying installation and minimizing potential failure points. Its robust construction ensures longevity in demanding environments, making it a preferred choice for applications where reliability is paramount. The 3RT60 series is known for its compact footprint, allowing for high-density control panel designs, a significant advantage in space-constrained industrial settings. Siemens' established reputation for quality and innovation further solidifies the market position of this contactor, offering users confidence in its performance and support.

Key Application Scenarios

This 110VDC contactor finds extensive use in motor control circuits, providing reliable switching for pumps, fans, compressors, and conveyors across various industries including manufacturing, water treatment, and building automation. Its suitability for DC applications makes it ideal for battery-powered systems, backup power solutions, and specialized industrial machinery. The 3RT6025-1BF40 is also commonly employed in lighting control systems, HVAC applications, and general power switching where precise and safe control of electrical loads is essential. Its ability to integrate with other control devices enables sophisticated automation sequences.

Practical System Integration Guidance

Integrating the Siemens 3RT6025-1BF40 into existing systems is straightforward due to its standardized DIN rail mounting and clear terminal designations. For motor control, it is typically wired in series with the motor power supply and controlled by a lower-voltage signal from a PLC or control relay connected to the 110VDC coil. Users should ensure that the ambient temperature and humidity are within the specified operating ranges to maintain performance. Wiring should be performed by qualified personnel adhering to local electrical codes and safety standards, ensuring proper torque is applied to terminals to prevent loose connections. For systems requiring remote monitoring or advanced control, the contactor's integrated auxiliary contacts can be wired to digital input modules of a PLC.

Operation and Risk Mitigation

The Siemens 3RT6025-1BF40 operates by energizing its 110VDC coil, which magnetically actuates the internal mechanism to close the three NO contacts, thereby completing the power circuit to the connected load. To mitigate risks, always ensure the power supply is de-energized before performing any wiring or maintenance. Verify correct coil voltage (110VDC) and current ratings (17A) to prevent overload or damage. Proper ventilation around the contactor is crucial to prevent overheating, especially in enclosed control panels. Regular inspection of terminals for signs of corrosion or looseness, and periodic testing of contactor functionality, will help ensure safe and reliable operation.

Scalability & Long-Term Value

The Siemens 3RT60 series, including the 3RT6025-1BF40, offers excellent scalability and long-term value within Siemens' broader automation ecosystem. Its compatibility with other Siemens components, such as PLCs, HMIs, and motor protection devices, facilitates seamless integration into larger, more complex systems. This compatibility ensures that as industrial processes evolve or expand, the contactor can be easily incorporated into upgraded or new control architectures. Furthermore, Siemens' commitment to developing IIoT-ready solutions means that components like the 3RT6025-1BF40 can be part of digital transformation initiatives, enabling enhanced diagnostics, predictive maintenance, and remote monitoring capabilities when integrated with appropriate gateways and software platforms.

Frequently Asked Questions

Q1: What is the coil voltage for the Siemens 3RT6025-1BF40?

The Siemens 3RT6025-1BF40 operates on a 110V DC coil voltage. This specific voltage is crucial for proper activation of the contactor's switching mechanism. Ensuring the correct DC supply is connected to the coil terminals is vital for its intended function and longevity.

This DC voltage requirement dictates its use in systems designed for direct current power sources. Always double-check the power supply specifications before connecting to avoid damage.

Matching the coil voltage precisely prevents under-energization or over-energization issues, both of which can lead to malfunction or premature failure of the device.

Q2: What is the current rating of the Siemens 3RT6025-1BF40?

This contactor is rated for 17 amps of operational current. This rating specifies the maximum continuous current the contacts can safely handle in their closed state. It's essential to match this rating to the load requirements of the circuit being controlled.

Exceeding the 17A rating can lead to contact overheating, welding, and eventual failure of the contactor. Proper sizing is a key aspect of electrical safety and equipment protection.

For applications with higher current demands, a larger contactor or multiple contactors in parallel would be necessary. Always consult load data and relevant standards.

Q3: How many poles does the Siemens 3RT6025-1BF40 have?

The Siemens 3RT6025-1BF40 features three normally open (NO) poles. "Normally open" means that the contacts are separated when the coil is de-energized and close to conduct current when the coil is energized.

These three NO poles are ideal for controlling three-phase loads or for switching three independent single-phase circuits simultaneously. The independent operation of each pole enhances system reliability.

When designing your control system, ensure the number and type of poles (NO/NC) match your specific switching requirements for each circuit.

Q4: Can the Siemens 3RT6025-1BF40 be used for AC loads?

This specific model, the 3RT6025-1BF40, is designed for 110V DC coil operation and is typically used in DC switching applications. While Siemens offers similar contactor series for AC loads, this particular part number is optimized for direct current.

Using an AC-rated contactor on DC or a DC-rated contactor on AC can lead to arc suppression issues and premature failure. It's crucial to select contactors specifically designed for the type of current (AC or DC) in your application.

Always verify the product's datasheet or markings to confirm its suitability for AC or DC operation before installation. This model's primary application is DC control circuits.

Q5: What accessories are available for the Siemens 3RT6025-1BF40?

The 3RT60 series contactors, including this model, often come with integrated accessories or support modular add-ons. These can include auxiliary contact blocks for additional signaling, surge suppression modules for coil protection, and mechanical interlocks.

The "with Accessories" in the product name suggests it may come pre-equipped with common additions like auxiliary contacts. Check the detailed product description or part number breakdown for specifics.

Users can typically expand functionality by adding further auxiliary contact modules (front or side mounted) or other compatible Siemens accessories designed for the 3RT60 range.

Q6: How is the Siemens 3RT6025-1BF40 mounted?

This contactor is designed for flexible mounting, commonly supporting both DIN rail (35mm) mounting and direct screw mounting. This adaptability allows it to be easily integrated into various control panel configurations and enclosures.

Ensure you use the appropriate mounting method for your specific enclosure and environmental conditions. Secure mounting is critical for vibration resistance and electrical safety.

The included mounting hardware or design features will dictate the exact installation procedure, so always refer to the user manual for best practices.

Q7: What is the IP rating of this contactor?

The Siemens 3RT6025-1BF40 typically has an IP20 rating for the enclosure itself. This means it is protected against solid objects larger than 12.5mm (like fingers) but offers no protection against water ingress.

For applications in dusty or humid environments, it's crucial to install the contactor within a suitable enclosure that provides the necessary environmental protection. The enclosure's IP rating will be the determining factor for overall system protection.

Ensure all cable entries into the enclosure are also properly sealed to maintain the desired level of protection against environmental factors.

Q8: Where is the Siemens 3RT6025-1BF40 typically used in industrial automation?

This contactor is widely used for motor control in various industrial machinery, such as pumps, fans, and conveyors. Its 110VDC coil makes it suitable for DC control circuits found in many automated systems.

It can also be employed in control panels for HVAC systems, lighting circuits, and as a switching element in power distribution units requiring DC control. Its reliability is key for continuous operation.

The 3RT60 series' compatibility with other Siemens automation products allows for seamless integration into larger PLC-controlled systems for complex automation tasks.

Q9: Does this contactor have any built-in surge protection?

While many Siemens contactors offer options for surge suppression, the inclusion of built-in surge protection depends on the specific configuration and any integrated accessories. The "with Accessories" might indicate some protective features.

Often, surge suppression modules are optional add-ons that can be fitted to the coil terminals to protect against voltage spikes when the coil is de-energized. This is especially important in systems prone to electrical noise.

It is advisable to consult the product's exact datasheet or configuration details to confirm if surge protection is included or if it needs to be added as a separate accessory for optimal coil life and system stability.

Q10: How do I wire the Siemens 3RT6025-1BF40 for motor control?

For motor control, the main power terminals of the 3RT6025-1BF40 are wired in series with the motor's power supply. The 110VDC coil is connected to a control voltage source, typically from a PLC output or control relay.

Ensure that the contactor's current rating (17A) is sufficient for the motor's full load ampere (FLA) rating, considering starting current. Overload protection is usually provided by a separate motor protection relay or device.

Always refer to the specific wiring diagrams provided by Siemens for the 3RT60 series and follow all applicable electrical codes and safety regulations during installation.