Siemens 3RT7046-1AN20 SIRIUS 3RT70 Coil Contactor 200VAC 95A 3NO

The Siemens 3RT7046-1AN20 SIRIUS 3RT70 Coil Contactor is a robust and reliable component designed for demanding industrial applications. This 200VAC, 95A contactor, featuring 3 normally open (NO) contacts, offers superior switching performance and extended operational lifespan. Its compact design and high switching capacity make it an ideal solution for motor control, power switching, and automation tasks across various sectors.

Product Specifications

| Feature             | Specification                      |

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

| Manufacturer        | Siemens                            |

| Series              | SIRIUS 3RT70                       |

| Model Number        | 3RT7046-1AN20                      |

| Coil Voltage        | 200 VAC                            |

| Rated Operational Current (AC-3) | 95 A                               |

| Number of NO Contacts | 3                                  |

| Auxiliary Contacts  | 0 NO, 0 NC                         |

| Mounting Type       | Screw Terminal                     |

| Enclosure Type      | IP20                               |

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

| Terminal Type       | Spring-loaded or Screw Terminal    |

| Certifications      | UL, CSA, CE                        |

Core Features & Market Positioning

The Siemens 3RT7046-1AN20 distinguishes itself through its robust construction and high reliability, key factors in industrial settings where downtime is costly. It leverages Siemens' extensive experience in control gear, positioning it as a premium choice for users prioritizing long-term performance and safety. The SIRIUS 3RT70 series is engineered for efficient heat dissipation and superior electrical contact integrity, ensuring stable operation even under heavy loads and frequent switching cycles. This focus on quality engineering translates into a reduced total cost of ownership by minimizing maintenance requirements and preventing premature failures, a significant advantage over less durable alternatives.

Key Application Scenarios

This Siemens contactor is exceptionally well-suited for direct-on-line (DOL) motor starting and stopping applications, where its 95A rating ensures adequate capacity for a wide range of industrial motors. It also excels in switching resistive loads, capacitor banks, and lighting circuits. In automation systems, the 3RT7046-1AN20 acts as a critical switching element for control panels, power distribution units, and machine tools. Its compatibility with various control voltages and integrated safety features makes it a versatile component for general-purpose switching tasks in manufacturing plants, process industries, and building automation systems.

Practical System Integration Guidance

Integrating the Siemens 3RT7046-1AN20 is straightforward due to its standardized mounting and terminal options. For motor control circuits, it is typically wired in series with the motor windings and controlled by a separate low-voltage control signal. The contactor coil is energized by the 200VAC supply, closing the main power contacts. Ensuring proper wiring, with strain relief and correct conductor sizing, is paramount for safe and reliable operation. Users should refer to the Siemens SIRIUS catalog for detailed wiring diagrams and load/controller matching guidelines to prevent damage and ensure optimal performance within their specific system architecture.

Operation and Risk Mitigation

Safe operation of the Siemens 3RT7046-1AN20 involves adhering to its specified electrical parameters and environmental conditions. Users must ensure that the supply voltage precisely matches the coil voltage (200VAC) and that the load current does not exceed the rated operational current (95A at AC-3 utilization category). Overloading can lead to overheating and contact welding, causing operational failure. Regular visual inspections for signs of wear, dust accumulation, or physical damage are recommended. In the event of operational anomalies, immediate de-energization and consultation of the product manual are advised to identify potential issues such as coil failure, contact wear, or external environmental factors.

Scalability & Long-Term Value

The SIRIUS 3RT70 series, and by extension the 3RT7046-1AN20, offers inherent long-term value through its compatibility with other Siemens automation components and adherence to international standards. This ensures that it can be seamlessly integrated into existing or future control systems, including those embracing Industry 4.0 concepts. While the 3RT70 itself is a foundational component, its integration into modular control systems allows for system expansion and upgrade paths. For advanced digital integration, pairing this contactor with Siemens' intelligent motor management systems or PLCs provides enhanced monitoring, diagnostics, and predictive maintenance capabilities, maximizing operational efficiency and asset longevity.

FAQs

What is the primary function of the Siemens 3RT7046-1AN20?

This Siemens contactor primarily serves as an electrically operated switch. It is designed to make and break power circuits, most commonly for controlling electric motors.

It allows for remote operation and automation by switching high-current circuits using a lower-power control signal. The 3RT7046-1AN20 is rated for 95A and a 200VAC coil.

Its robust design ensures reliability in demanding industrial environments, offering a long operational life for critical switching tasks.

Can the Siemens 3RT7046-1AN20 be used for DC applications?

No, the Siemens 3RT7046-1AN20 is specifically designed for AC (Alternating Current) applications. Its coil voltage is rated at 200VAC, and its operational current rating (AC-3) is also for AC loads.

Using this contactor with DC circuits could lead to improper operation, arcing, and premature failure. DC circuits require contactors with different designs to manage the unique arc-quenching needs.

Always verify the product's specifications and intended use before integrating it into any electrical system to ensure safety and prevent equipment damage.

What is the maximum load this contactor can handle?

The Siemens 3RT7046-1AN20 is rated for a maximum operational current of 95 Amperes under AC-3 utilization category. This rating is crucial for motor control applications.

The AC-3 rating signifies its suitability for starting squirrel-cage motors and switching them off during normal running. It's important not to exceed this current to prevent contact welding or overheating.

Always consult the product's datasheet for specific environmental derating factors or if the application deviates from standard AC-3 motor control usage.

How do I wire the Siemens 3RT7046-1AN20 contactor?

Wiring involves connecting the main power terminals to the load and the power source, and the control circuit to the coil terminals. The 200VAC coil requires a stable power supply.

Ensure that all connections are secure, using appropriate cable sizes and terminal torque settings. Follow local electrical codes and wiring diagrams provided by Siemens for safety and optimal performance.

This contactor uses screw terminals for power and coil connections, facilitating a secure mechanical connection.

What are the key technical specifications of the Siemens 3RT7046-1AN20?

Key specifications include a 200VAC coil voltage and a 95A operational current rating (AC-3). It features three normally open (NO) main contacts.

The device is designed for screw terminal mounting and has an IP20 enclosure rating, protecting against solid objects larger than 12.5mm. It operates within an ambient temperature range of -25°C to +60°C.

It also holds certifications like UL, CSA, and CE, ensuring compliance with international safety and performance standards for industrial use.

What are common issues encountered with Siemens 3RT70 contactors?

Common issues can include coil failure due to voltage fluctuations or overheating, and contact wear or welding from overloading or frequent switching.

Environmental factors such as excessive dust, humidity, or vibration can also impact performance and longevity. Improper installation or undersized wiring can lead to operational problems.

Regular inspection and maintenance, along with adherence to operational limits, can mitigate most common issues.

How does the 3RT7046-1AN20 compare to other Siemens SIRIUS contactors?

The 3RT70 series is part of the broader SIRIUS line, known for its modularity and reliability. This specific model offers a balance of capacity and compactness.

Compared to smaller SIRIUS models, the 3RT7046-1AN20 provides a higher current rating (95A) suitable for larger motor applications. It may differ in auxiliary contact options or specific overload relay compatibility.

It represents a robust, general-purpose contactor within the SIRIUS ecosystem, suitable for a wide array of standard industrial tasks.

Can I add auxiliary contacts to the 3RT7046-1AN20?

The Siemens 3RT7046-1AN20 itself is specified with no additional auxiliary contacts (0 NO, 0 NC). However, many SIRIUS contactors in this range are designed to accept add-on auxiliary contact blocks.

Users typically need to purchase and install these blocks separately if additional NO or NC contacts are required for control or signaling purposes. Compatibility with specific add-on blocks should be verified.

Consulting the Siemens SIRIUS accessories catalog is essential to identify the correct auxiliary contact modules that can be attached to this specific contactor base unit.

What is the IP rating of the Siemens 3RT7046-1AN20 and what does it mean?

The Siemens 3RT7046-1AN20 has an IP20 rating. This means it is protected against solid objects greater than 12.5 mm in diameter, such as fingers.

However, it offers no protection against water ingress. This rating is typical for components installed within control cabinets or enclosures where protection from the environment is provided by the enclosure itself.

For applications requiring higher environmental protection, an appropriately rated enclosure must be used in conjunction with the contactor.

What is the operational life expectancy of this contactor?

The operational life expectancy of the Siemens 3RT7046-1AN20 is dependent on several factors, including the electrical load, switching frequency, and environmental conditions. Siemens generally rates their SIRIUS contactors for millions of switching cycles under ideal conditions.

For example, under AC-3 utilization category with a full load, a contactor might be rated for hundreds of thousands to over a million mechanical and electrical cycles. However, frequent switching or operating at the maximum rated current will reduce this lifespan.

To ensure maximum longevity, it is critical to operate the contactor within its specified parameters, maintain proper ventilation, and perform regular inspections as per Siemens' recommendations.