Siemens 3RT6025-1AN20 Industrial AC Control Contactor 220VAC 17A 3NO

The Siemens 3RT6025-1AN20 is a robust industrial AC control contactor engineered for reliable power switching in demanding applications. This 220VAC, 17A contactor features three normally open (3NO) poles, making it ideal for motor control, lighting circuits, and general power distribution. Its compact design, high switching capacity, and Siemens' renowned quality ensure exceptional performance and longevity in diverse industrial environments.

Product Specifications

| Feature          | Specification                                  |

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

| Manufacturer     | Siemens                                        |

| Product Series   | 3RT6                                           |

| Model Number     | 3RT6025-1AN20                                  |

| Type             | AC Control Contactor                           |

| Coil Voltage     | 220 VAC                                        |

| Rated Current    | 17 A                                           |

| Number of Poles  | 3                                              |

| Pole Configuration | 3 Normally Open (3NO)                          |

| Auxiliary Contacts | None included (can be added)                   |

| Mounting         | DIN rail or screw mounting                     |

| Protection Class | IP20                                           |

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

| Terminal Type    | Screw Terminals                                |

Core Features & Market Positioning

The Siemens 3RT6025-1AN20 distinguishes itself through its superior build quality and adherence to international standards, ensuring dependable operation where failure is not an option. As part of Siemens' extensive SIRIUS range, this contactor benefits from a mature and widely adopted platform, offering excellent compatibility and support within industrial automation ecosystems. Its primary competitive advantage lies in its reliable performance under continuous load cycles and its straightforward integration into control panels, positioning it as a preferred choice for plant engineers and system integrators seeking robust and cost-effective switching solutions. The 3RT6025-1AN20 exemplifies the reliability and efficiency expected from a leading global automation provider.

Key Application Scenarios

This Siemens contactor is extensively utilized in motor control circuits for pumps, fans, conveyors, and other machinery requiring reliable on/off switching. Its 17A rating is well-suited for medium-duty loads in HVAC systems, industrial lighting control, and power distribution panels within manufacturing facilities. Furthermore, the 3NO configuration makes it a fundamental component in control logic for sequencing operations and managing power flow to various electrical equipment in process industries and building automation. Its versatility allows for seamless integration into both new installations and upgrades of existing control systems.

Practical System Integration Guidance

Integrating the Siemens 3RT6025-1AN20 into an industrial control system is a streamlined process due to its standard mounting options and clear terminal markings. For DIN rail mounting, simply slide the contactor onto the rail until it clicks into place. Screw mounting requires appropriate fasteners through the designated holes. Wiring involves connecting the power conductors to the main terminals (L1, L2, L3 for loads and T1, T2, T3 for supply) and the control circuit to the coil terminals (A1 and A2) with the correct 220VAC supply. It's crucial to ensure proper wire termination to prevent loose connections and potential arc faults. Overload protection, typically via a Siemens 3RU overload relay or a solid-state motor protection device, should always be wired in series with the contactor's power circuit to safeguard the motor from overcurrent conditions.

Operation and Risk Mitigation

The Siemens 3RT6025-1AN20 operates by using a 220VAC coil to generate a magnetic field that closes the three normally open contacts, thereby completing the power circuit. To mitigate operational risks, always ensure the coil voltage precisely matches the available supply (220VAC) to prevent coil burnout or improper operation. Implement appropriate overload and short-circuit protection devices in the circuit to prevent damage to the contactor and connected equipment. Before performing any maintenance or wiring changes, always de-energize the control panel and verify the absence of voltage using a reliable multimeter. Proper grounding of the control panel and all connected equipment is also essential for electrical safety.

Scalability & Long-Term Value

The Siemens 3RT6025-1AN20 is part of the highly scalable SIRIUS modular system, allowing for easy expansion and integration. While this specific model has 3NO poles, additional auxiliary contact blocks (normally open or normally closed) can be easily attached to the front or side for increased control flexibility, enabling more complex logic functions or signaling capabilities. Its compatibility with other SIRIUS components, such as overload relays and circuit breakers, ensures seamless integration into existing or future automation architectures. For enhanced long-term value and digital integration, the 3RT6025-1AN20 can be incorporated into networked control systems managed by PLCs, facilitating remote monitoring, diagnostics, and participation in Industrial Internet of Things (IIoT) initiatives, thereby optimizing operational efficiency and predictive maintenance strategies.

Frequently Asked Questions

What is the purpose of a Siemens 3RT6025-1AN20 contactor?

This contactor serves as an electrically operated switch for controlling power circuits. It's designed for frequent switching operations in industrial settings.

It's commonly used to start and stop electric motors. The 3RT6025-1AN20 can also control lighting or heating elements. Its primary function is remote control of electrical loads.

The device uses a 220VAC coil to electromagnetically actuate its contacts. This allows a low-voltage control signal to switch high-power circuits safely.

How do I wire a Siemens 3RT6025-1AN20 contactor?

Connect the control circuit to the coil terminals A1 and A2 with 220VAC. Ensure correct polarity if DC coil is used (not applicable here).

Wire the main power circuit through terminals L1, L2, L3 and T1, T2, T3. L terminals are for supply, T terminals are for load.

Always verify wiring against the schematic and product manual. Use appropriate wire gauges for the current rating.

What is the maximum current rating for the Siemens 3RT6025-1AN20?

The contactor is rated for a maximum continuous current of 17 Amperes. This rating is for AC-3 duty (motor control).

Ensure the connected load does not exceed this 17A limit. Exceeding this can cause overheating and contact damage.

For specific applications, always refer to the detailed AC-3 utilization category data in the Siemens manual.

Can I add auxiliary contacts to the 3RT6025-1AN20?

Yes, auxiliary contact blocks can be easily added. They mount to the front or side of the contactor.

You can add normally open (NO) or normally closed (NC) contacts. This expands control and signaling capabilities.

These auxiliary contacts are ideal for interlocks, status feedback, or interlocking with other devices.

What coil voltage does the Siemens 3RT6025-1AN20 use?

The coil voltage for this specific model is 220 VAC. This is the standard industrial mains voltage in many regions.

It is crucial to supply the correct voltage to the coil terminals (A1 and A2). Incorrect voltage can damage the coil.

Always double-check the coil voltage rating on the contactor label before connecting power.

What does 3NO mean for this contactor?

3NO signifies that the contactor has three poles, each with a normally open contact configuration. This means the contacts are open when the coil is de-energized.

When the 220VAC coil is energized, these three normally open contacts close simultaneously. This allows current to flow to the connected load.

This configuration is standard for direct motor starting applications or switching power to loads.

Is the Siemens 3RT6025-1AN20 suitable for DC loads?

No, this contactor is specifically designed for AC control circuits and AC loads. Using it for DC loads is not recommended.

DC circuits have different arc quenching requirements than AC circuits. This contactor lacks the necessary features for reliable DC switching.

For DC applications, you would need a contactor specifically rated and designed for DC voltage and current.

What are the dimensions of the 3RT6025-1AN20?

The contactor has a compact footprint suitable for standard control panels. Its exact dimensions are typically detailed in the product datasheet.

It's designed to fit on standard 35mm DIN rails, facilitating easy mounting. Screw mounting options are also available.

Refer to the official Siemens datasheet for precise width, height, and depth measurements to ensure panel space compatibility.

What is the protection class (IP rating) of this contactor?

The Siemens 3RT6025-1AN20 typically has an IP20 protection rating. This means it is protected against solid objects larger than 12.5mm.

This rating indicates it's suitable for indoor use within control cabinets. It does not offer protection against water or dust ingress.

For harsh environments, additional enclosures or contactors with higher IP ratings may be necessary.

Where can I find the official datasheet for the 3RT6025-1AN20?

You can find the official datasheet on the Siemens Industry Online Support (SIOS) portal. It's the most reliable source for technical information.

Search the SIOS portal using the exact product number "3RT6025-1AN20". This will provide access to the product's technical data, manuals, and certifications.

Alternatively, authorized Siemens distributors often provide links to datasheets for the products they sell.