Siemens 3RT6926-1ER00 Surge Suppression Protection Accessory

This article provides a comprehensive overview of the Siemens 3RT6926-1ER00 surge suppression protection accessory, tailored for industrial professionals seeking detailed technical information and application insights.

Siemens 3RT6926-1ER00: Enhanced Electrical System Protection

The Siemens 3RT6926-1ER00 is a vital accessory designed to protect electrical systems, particularly motor contactors, from damaging voltage surges. This diode combination surge suppressor offers a robust solution for enhancing the reliability and lifespan of industrial electrical equipment. Its compact design, ease of integration, and effective surge suppression capabilities make it a valuable component in various industrial automation and control applications.

#Product Specifications

| Feature                   | Specification                                    |

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

| Product Number            | 3RT6926-1ER00                                    |

| Product Type              | Surge suppressor, diode combination              |

| Size                      | S0 (for motor contactors)                        |

| Control Supply Voltage    | 24 V DC                                          |

| Packaging Dimensions      | 55.00 x 27.00 x 12.00 mm                         |

| Net Weight                | 0.004 Kg                                         |

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

| Storage Temperature       | -40 to +80 °C                                    |

| Mounting Method           | Clip-on                                          |

| Country of Origin         | China                                            |

| RoHS Compliance           | Since 01.05.2012                                 |

| Lead (CAS-No. 7439-92-1)  | Present (> 0.1 % w/w)                            |

| Life Cycle Status         | Active Product                                   |

| Product Class             | A: Standard product (stock item)                 |

#Core Features & Market Positioning

The Siemens 3RT6926-1ER00 distinguishes itself through its straightforward yet effective design as a surge suppressor. It is specifically engineered for use with Siemens SIRIUS motor contactors of size S0, ensuring seamless integration and optimized performance within the SIRIUS ecosystem. The diode combination effectively absorbs transient voltage spikes that can arise from switching inductive loads, thereby preventing premature failure of contactor coils and associated electronic components. In the competitive landscape of industrial control components, Siemens positions this accessory as a reliable, cost-effective solution for enhancing system longevity and reducing maintenance downtime, leveraging the brand's reputation for quality and durability.

#Key Application Scenarios

This surge suppression accessory finds its primary utility in applications where motor contactors are frequently switched, leading to voltage transients. Common scenarios include:

  Motor Control Circuits: Protecting the coils of motor contactors used in starting, stopping, and reversing electric motors across various industries such as manufacturing, material handling, and HVAC systems.  Industrial Automation: Ensuring the stable operation of control panels and automated machinery where reliable switching is critical for process continuity.  Power Distribution: Safeguarding components within electrical cabinets that are subject to electrical noise and voltage fluctuations.  Machine Tools: Enhancing the reliability of control systems in CNC machines and other automated equipment where precise and consistent operation is paramount.

#Practical System Integration Guidance

Integrating the Siemens 3RT6926-1ER00 into an existing system is a direct process. It is designed to be mounted on top of size S0 SIRIUS motor contactors, utilizing a simple clip-on mechanism. The accessory does not require separate wiring for its basic function, as it is plugged directly into the contactor's auxiliary circuit terminals. For a 24 V DC control supply voltage, it connects directly to the coil circuit of the contactor, providing immediate surge protection. It's important to ensure the contactor is rated for the appropriate size (S0) and that the control voltage matches the accessory's specifications (24 V DC). Always consult the relevant SIRIUS Contactor S0 manual for detailed wiring diagrams and safety precautions before installation.

#Operation and Risk Mitigation

The 3RT6926-1ER00 operates by actively clamping or suppressing voltage spikes that exceed a safe operating threshold. When an inductive load (like a motor coil) is de-energized, it generates a back EMF, which can cause a significant voltage surge. The diode combination within the accessory provides a path for this transient energy to dissipate, preventing it from reaching sensitive control circuitry. This significantly mitigates the risk of coil burnout, insulation breakdown, and erratic behavior in connected electronic devices. While the accessory itself is robust, incorrect installation or use outside of specified parameters (e.g., incorrect voltage) can lead to premature failure. Proper selection and installation are key to risk mitigation.

#Scalability & Long-Term Value

While the 3RT6926-1ER00 is a specific accessory for size S0 contactors, its long-term value lies in its contribution to the overall reliability and longevity of the control system. By preventing premature component failures, it reduces the likelihood of costly unplanned downtime and repair expenses. For larger systems or different contactor sizes, Siemens offers a range of surge suppression solutions within the broader SIRIUS portfolio, ensuring scalability. The integration of these protection components aligns with the principles of robust industrial automation, where system uptime and maintainability are critical economic factors. Future-proofing can be achieved by selecting contactors and accessories that are compatible with modern industrial communication protocols and IIoT integration platforms, though this specific accessory's function is purely electrical protection.

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Frequently Asked Questions (FAQs)

1. What is the primary function of the Siemens 3RT6926-1ER00?

This accessory acts as a surge suppressor. It protects electrical components from damaging voltage spikes. Its main role is to absorb transient energy.

It is designed to be used with Siemens motor contactors. Specifically, it's for size S0 contactors. It connects directly to the contactor's coil circuit.

The device employs a diode combination to clamp excess voltage. This prevents damage to sensitive control circuitry and contactor coils.

2. Which Siemens contactor sizes is the 3RT6926-1ER00 compatible with?

The 3RT6926-1ER00 is specifically designed for size S0 motor contactors. This ensures a proper fit and electrical connection.

It is engineered to integrate directly onto the top of these S0-sized contactors. This plug-and-play capability simplifies installation.

Using this accessory with contactors of other sizes is not recommended. It may lead to improper function or system damage.

3. What is the rated control supply voltage for this surge suppressor?

The Siemens 3RT6926-1ER00 operates with a DC control supply voltage. The specified rated value is 24 V DC.

This voltage rating must match the coil voltage of the motor contactor it is paired with. Incorrect voltage can cause failure.

Always verify the control voltage of your application before installing this accessory. Check the contactor's specifications as well.

4. Can the Siemens 3RT6926-1ER00 be used with AC control circuits?

No, this surge suppressor is designed exclusively for DC control supply voltages. Its intended use is with 24 V DC circuits.

Using it in an AC control circuit would render it ineffective and could lead to damage. The internal components are not designed for AC transients.

For AC applications, Siemens offers different surge suppression modules. Always select the correct accessory for your specific circuit type.

5. How is the 3RT6926-1ER00 installed onto a motor contactor?

Installation is straightforward and typically tool-free. It clips directly onto the top of a size S0 Siemens motor contactor.

The accessory is designed to plug into the contactor's auxiliary terminals. This provides an integrated surge protection solution.

Ensure the contactor is de-energized and properly isolated before mounting the surge suppressor to avoid electrical hazards.

6. What type of protection does a diode combination surge suppressor offer?

A diode combination suppressor, like the 3RT6926-1ER00, absorbs transient voltage spikes. These spikes often result from switching inductive loads.

It clamps the voltage to a safe level, preventing damage to the contactor coil and connected electronics. This extends equipment lifespan.

This type of protection is effective against rapid voltage fluctuations common in motor control circuits. It enhances system reliability.

7. Are there any known successors or replacements for the 3RT6926-1ER00?

Some sources indicate that the 3RT1926-1ER00, which is closely related, is a phased-out product. Its successor is noted as the SIRIUS 3RT2926-1ER00.

The 3RT6926-1ER00 is also listed as an active product, but it's wise to check current availability and cross-reference with newer models.

For the most current information on product lifecycle and recommended replacements, consulting Siemens' official SiePortal or a Siemens partner is advised.

8. What are the operating and storage temperature ranges for this accessory?

The Siemens 3RT6926-1ER00 can operate within a temperature range of -25 °C to +60 °C. This covers a broad spectrum of industrial environments.

For storage, the acceptable temperature range is wider, from -40 °C to +80 °C. This ensures stability during warehousing.

Adhering to these temperature specifications is crucial for maintaining the product's performance and longevity.

9. Does the 3RT6926-1ER00 contain any hazardous substances according to RoHS?

Yes, the product contains Lead (CAS-No. 7439-92-1) above the 0.1% threshold. This is noted in its compliance information.

However, its compliance with RoHS directive restrictions is confirmed, meaning it adheres to current regulations for its intended use.

Users should refer to the product's data sheet for detailed environmental compliance and substance information.

10. Where can I find more technical documentation for the Siemens 3RT6926-1ER00?

Siemens' official SiePortal is the primary resource for comprehensive documentation. This includes data sheets, manuals, and certificates.

You can also find detailed product information, including specifications and download links for datasheets, on distributor websites like RS Online.

For specific application support or advanced troubleshooting guides, contacting Siemens support or a local Siemens partner is recommended.