Siemens 3RT5055-6AF36 Compact SIRIUS 3RT50 Contactor 110-127VAC/DC 150A 3NO

The Siemens 3RT5055-6AF36, a pivotal component within the SIRIUS 3RT50 compact contactor line, stands as a robust solution for demanding industrial control applications. Engineered for reliability and efficiency, this contactor boasts a 110-127VAC/DC coil voltage and a substantial 150A rating, supported by three normally open (3NO) auxiliary contacts. Its compact design minimizes panel space, while its advanced SIRIUS technology ensures superior performance and longevity in environments requiring precise power switching.

Siemens 3RT5055-6AF36: Product Specifications

| Parameter              | Value                  |

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

| Product Type           | Contactor              |

| Series                 | SIRIUS 3RT50           |

| Manufacturer           | Siemens                |

| Model Number           | 3RT5055-6AF36          |

| Coil Voltage           | 110-127VAC/DC          |

| Rated Operational Current (AC-3, 400V) | 150 A                  |

| Number of Auxiliary Contacts | 3 NO (Normally Open)   |

| Auxiliary Contact Type | Spring-loaded terminal |

| Enclosure Type         | IP20                   |

| Mounting Type          | DIN rail or Screw      |

| Dimensions (H x W x D) | 127 x 70 x 153 mm      |

| Standards Compliance   | IEC 60947-4-1, VDE 0660 |

Core Features & Market Positioning

The Siemens 3RT5055-6AF36 distinguishes itself through its exceptional thermal performance and high switching capacity, crucial for heavy-duty motor control and power distribution systems. Its SIRIUS design integrates advanced features like a low-wear, reliable contact system and integrated surge suppression, enhancing operational safety and reducing maintenance requirements. This makes it a preferred choice for engineers seeking a balance of robust performance, compact footprint, and long-term operational cost savings in competitive industrial automation landscapes. The inherent flexibility in mounting options, including DIN rail and direct screw mounting, further solidifies its position as a versatile component for various control panel configurations.

Key Application Scenarios

Engineers frequently deploy the Siemens 3RT5055-6AF36 in demanding industrial settings that require reliable and safe switching of high-power loads. Its primary applications include controlling large electric motors in manufacturing plants, managing power distribution in substations, and implementing complex switching logic in automated production lines. The contactor is particularly well-suited for applications where frequent switching cycles are expected, such as in conveyor systems, pump stations, and HVAC systems within large commercial buildings. Its robust design ensures consistent operation even under challenging environmental conditions, making it a dependable component for critical infrastructure.

Practical System Integration Guidance

Integrating the Siemens 3RT5055-6AF36 into existing control systems is streamlined due to its standardized mounting and connection options. The contactor accepts standard control wiring for its 110-127VAC/DC coil, requiring appropriate circuit protection for both the power and control circuits. For installations demanding high current handling, direct wiring with appropriately sized conductors is essential, ensuring compliance with local electrical codes. The spring-loaded terminal connections offer a secure and vibration-resistant connection, simplifying maintenance and reducing the likelihood of connection failures. When designing control circuits, engineers should consider the inrush current characteristics of the connected load to ensure the contactor's rating is sufficient.

Operation and Risk Mitigation

Proper operation of the Siemens 3RT5055-6AF36 necessitates adherence to specified environmental conditions and electrical parameters to prevent premature failure or safety hazards. Users must ensure the coil voltage remains within the 110-127VAC/DC range and that the connected load does not exceed the 150A rating under AC-3 duty. Overloading can lead to excessive heat generation, potentially damaging the contactor and surrounding equipment, and posing a fire risk. Regular inspection of wiring connections for signs of corrosion or loosening is recommended, alongside periodic checks of contact wear if the application involves extremely high switching frequencies. Earthing the contactor's metal parts is a critical safety measure to prevent electrical shock in the event of insulation failure.

Scalability & Long-Term Value

The Siemens 3RT5055-6AF36 offers significant long-term value through its compatibility with the broader SIRIUS modular system. This allows for easy integration with other SIRIUS components, such as overload relays and circuit breakers, to create comprehensive motor control solutions. For industries embracing Industry 4.0, this contactor can be integrated into smart control cabinets, enabling remote monitoring and diagnostics when paired with appropriate communication modules. Its robust construction and Siemens' reputation for product longevity ensure a reliable performance over an extended operational life, minimizing the need for frequent replacements and contributing to overall system efficiency.

Frequently Asked Questions

What is the primary function of the Siemens 3RT5055-6AF36 contactor?

This device serves as an electrically operated switch. It is designed to safely and reliably control high-power electrical circuits. Its main role is to make or break circuits for motors or other industrial loads.

Its robust construction ensures it can handle demanding switching cycles. The 150A rating makes it suitable for significant power applications. The 3NO configuration allows for basic control logic.

The 3RT5055-6AF36 is crucial for automated systems requiring remote or sequential power switching. It ensures operational safety and efficiency in industrial environments.

How do I correctly wire the Siemens 3RT5055-6AF36 contactor for a motor application?

Ensure the main power terminals are connected to the load and the power source. Use appropriate gauge wiring for the 150A rating. Connect the coil terminals to the 110-127VAC/DC control voltage supply.

Wire the three normally open (3NO) auxiliary contacts to your control logic. These can be used for feedback signals, interlocking, or initiating other actions. Always follow local electrical codes and best practices.

Incorporate proper overload protection, like a Siemens 3RU overload relay, upstream or in conjunction. This safeguards the motor and the contactor from overcurrent conditions.

What are the typical industrial applications for the Siemens 3RT5055-6AF36?

This contactor is widely used for controlling three-phase induction motors. It's ideal for applications like pumps, fans, compressors, and conveyor systems in factories. It’s also used in power distribution systems for load switching.

Its high current rating (150A) suits large machinery and heavy-duty industrial processes. The compact SIRIUS design is advantageous for space-constrained control panels. It ensures reliable operation in challenging manufacturing environments.

You'll find it in sectors like food processing, automotive manufacturing, and material handling. Anywhere robust, reliable motor control is paramount, this contactor is a strong candidate.

Can the Siemens 3RT5055-6AF36 be integrated with PLC systems?

Yes, it integrates seamlessly with Programmable Logic Controllers (PLCs). The 110-127VAC/DC coil can be directly controlled by a PLC output module. Ensure the PLC output can handle the coil's current draw.

The 3NO auxiliary contacts provide valuable feedback to the PLC. This feedback confirms the contactor's state (open or closed) for monitoring and control logic. It allows for advanced automation strategies.

Proper interfacing, potentially including isolation relays for sensitive PLC inputs, ensures reliable communication. This enables sophisticated automation and process control.

What is the significance of the 110-127VAC/DC coil voltage on the 3RT5055-6AF36?

This dual voltage rating offers flexibility in different regions and installations. It can operate on either AC or DC power within this range. This adaptability simplifies inventory for global manufacturers.

The 110-127V range is a common control voltage standard in many industrial settings. It allows for widespread compatibility with existing control power supplies. This reduces the need for voltage converters.

Choosing the correct coil voltage is crucial for proper operation. Incorrect voltage can lead to malfunction or damage to the contactor. Always verify your control circuit voltage matches the contactor's requirement.

How does the SIRIUS 3RT50 series offer advantages over older contactor technologies?

SIRIUS 3RT50 contactors feature advanced contact materials for extended life. They incorporate built-in surge suppression, protecting control circuits from voltage spikes. Their compact, modular design simplifies panel building and maintenance.

These contactors often exhibit lower energy consumption for the coil. They are designed for high switching frequencies and reliability. This leads to reduced downtime and lower operational costs.

The series also offers enhanced safety features and compliance with modern international standards. This makes them a forward-looking choice for new installations and upgrades.

What are the IP rating and mounting options for the Siemens 3RT5055-6AF36?

The contactor has an IP20 rating. This means it is protected against solid objects larger than 12.5mm. It is not protected against water ingress, so it requires installation in a control cabinet.

It offers versatile mounting options. It can be mounted on a standard 35mm DIN rail for quick installation. Alternatively, it can be directly screw-mounted to a panel for permanent fixtures.

These mounting choices provide flexibility for panel designers. They accommodate different installation preferences and cabinet layouts. This enhances its usability across various applications.

What safety precautions should be taken when installing or servicing the 3RT5055-6AF36?

Always de-energize the control circuit and main power supply before installation or maintenance. Lockout/Tagout procedures must be strictly followed to prevent accidental re-energization. Ensure proper earthing of the contactor's metal parts.

Verify that the installed wiring gauge is appropriate for the 150A current rating. Ensure all connections are tight and secure to prevent overheating and potential fire hazards. Wear appropriate personal protective equipment (PPE).

Familiarize yourself with the product's technical data sheet and relevant safety standards. If unsure about any procedure, consult a qualified electrician or technician.

What is the expected lifespan and reliability of the Siemens 3RT5055-6AF36?

Siemens contactors, especially within the SIRIUS line, are engineered for high reliability and long operational life. The lifespan is typically measured in millions of electrical switching cycles. This depends heavily on the application's load conditions and switching frequency.

The 3RT5055-6AF36 utilizes robust materials and proven contact technology. This ensures consistent performance over its service life. Proper installation and adherence to operating limits maximize its reliability.

Regular maintenance and inspection can further extend its lifespan. Minimizing overloads and ensuring clean operating environments contribute to its longevity.

How does the 3RT5055-6AF36 contribute to energy efficiency in industrial systems?

While contactors consume minimal energy during operation, the SIRIUS design optimizes this. They feature low coil power consumption, especially in DC versions. This reduces overall energy draw in control systems.

Efficient switching is also key. Reliable contact closure minimizes resistance, reducing energy loss as heat. This contributes to system efficiency, particularly in high-cycle applications.

By enabling precise motor control and preventing energy waste from uncontrolled starts/stops, the contactor indirectly supports energy savings. Its durability also means fewer replacements, reducing the environmental impact of manufacturing and disposal.