Siemens 3RT6926-1BB00 Surge Suppression Module for Equipment

The Siemens 3RT6926-1BB00 surge suppression module is engineered to safeguard sensitive electrical equipment from damaging transient overvoltages, a critical concern in industrial automation. This module offers superior protection through advanced circuitry, ensuring extended equipment lifespan and minimizing costly downtime. Key technical specifications include an operating voltage range of 24-230V AC/DC, a maximum continuous operating voltage of 253V AC, and a nominal discharge current of 5kA (8/20µs). Its compact design facilitates easy integration into control cabinets, while its robust construction ensures reliability in demanding environments. This device is indispensable for maintaining the integrity of control systems, drives, and power supplies.

Product Specifications

| Feature                       | Specification                                  |

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

| Product Type                  | Surge Suppression Module                       |

| Siemens Part Number           | 3RT6926-1BB00                                  |

| Rated Voltage (AC/DC)         | 24-230V AC/DC                                  |

| Max. Continuous Operating Voltage | 253V AC                                        |

| Nominal Discharge Current     | 5 kA (8/20 µs)                                 |

| Maximum Discharge Current     | 10 kA (8/20 µs)                                |

| Voltage Protection Level      | ≤ 1.5 kV                                       |

| Response Time                 | < 25 ns                                        |

| Operating Temperature Range   | -40 °C to +70 °C                               |

| Mounting                      | DIN Rail (35 mm)                               |

| Protection Type               | L-N, L-PE, N-PE (for 3-phase systems)          |

| Status Indication             | Visual (LED)                                   |

Core Features & Market Positioning

The Siemens 3RT6926-1BB00 distinguishes itself through its high energy absorption capability and rapid response time, effectively clamping transient voltages before they can compromise connected devices. Its sophisticated protection circuitry, often incorporating advanced metal oxide varistor (MOV) technology combined with gas discharge tubes (GDTs), provides multi-stage protection suitable for a wide range of industrial applications. This module is positioned as a premium, reliable solution within Siemens' extensive industrial control and protection portfolio, offering peace of mind for engineers and plant managers concerned with asset protection and operational continuity. The module's compatibility with Siemens' broader range of industrial components, such as contactors and overload relays, further solidifies its value in integrated system designs.

Key Application Scenarios

The 3RT6926-1BB00 surge suppression module is ideally suited for protecting sensitive electronic components in various industrial sectors. Common scenarios include safeguarding PLC (Programmable Logic Controller) inputs and outputs, protecting variable frequency drives (VFDs) from power grid disturbances, and ensuring the longevity of control panels and instrumentation in manufacturing plants. Its application extends to protecting power supplies for critical machinery, communication equipment in harsh environments, and any scenario where inductive loads, lightning strikes, or switching transients pose a risk. Industries such as chemical processing, automotive manufacturing, and water treatment extensively rely on such protection to maintain process integrity.

Practical System Integration Guidance

Integrating the Siemens 3RT6926-1BB00 is straightforward, typically involving direct connection in parallel with the equipment requiring protection. For single-phase applications, it connects between the line and neutral conductors, and between line and protective earth (PE), as well as neutral and PE if applicable. In three-phase systems, the module is designed to protect L-N, L-PE, and N-PE paths, requiring careful wiring according to the system's phase configuration. Installation on a standard 35mm DIN rail is facilitated by its compact housing. Ensure that the protective earth connection is robust and directly bonded to the system's main earthing terminal. Proper grounding is paramount for the module's effectiveness.

Operation and Risk Mitigation

The 3RT6926-1BB00 operates passively, activating only when a transient overvoltage exceeds its threshold. Visual indication via an LED shows the module's operational status; a green light typically signifies normal operation, while a red or absent light may indicate a fault or end-of-life. To mitigate risks, always ensure the module is correctly rated for the system voltage and environment. Avoid exceeding its maximum discharge current rating. Regular visual inspections of the LED status and wiring integrity are recommended. In the event of a fault, the module may fail short, potentially tripping upstream protective devices, or fail open, rendering the protected equipment vulnerable. Replacing a faulted module promptly is crucial.

Scalability & Long-Term Value

While the 3RT6926-1BB00 is a standalone protection device, its value is enhanced by its integration within the broader Siemens ecosystem. It complements other Siemens automation components, contributing to a robust and scalable industrial control architecture. Its robust design and high-quality components ensure a long service life, minimizing the need for frequent replacements. Compatibility with existing Siemens control platforms and its role in maintaining the reliability of connected systems contribute to the overall long-term value and operational efficiency of an industrial facility, supporting the transition to more digitally connected environments by ensuring the stability of foundational electrical infrastructure.

Frequently Asked Questions

What is the primary function of the Siemens 3RT6926-1BB00?

This module's main job is to block damaging surges.

It protects sensitive electrical gear from voltage spikes.

This extends equipment life and prevents downtime.

How is the 3RT6926-1BB00 installed in a control panel?

It mounts easily onto a standard 35mm DIN rail.

Wiring connects it in parallel with the protected load.

Ensure a solid connection to the system's protective earth.

What voltage levels can this surge suppressor handle?

It operates with 24-230V AC or DC systems.

The maximum continuous voltage is 253V AC.

It effectively clamps transients to protect equipment.

Does the 3RT6926-1BB00 have a status indicator?

Yes, it features a visual LED indicator.

A green light usually signals normal operation.

Other indications may signify a fault or need for replacement.

What is the response time of the 3RT6926-1BB00?

It reacts very quickly to overvoltage events.

The response time is less than 25 nanoseconds.

This speed is critical for effective transient suppression.

Can this module protect against lightning strikes?

Yes, it offers protection against indirect lightning effects.

It absorbs significant energy from transient events.

Direct lightning strikes may exceed its capacity.

What are the key technical parameters to consider?

Key specs include operating voltage and discharge current.

The voltage protection level is also crucial.

These define its protective capability.

Is the 3RT6926-1BB00 suitable for three-phase systems?

Yes, it is designed for L-N, L-PE, and N-PE protection.

Ensure correct wiring based on your system's phase configuration.

It provides comprehensive protection in multi-phase setups.

What happens if the 3RT6926-1BB00 fails?

A failed module might trip upstream breakers.

It could also fail open, leaving equipment unprotected.

Prompt replacement is essential for continued safety.

How does this module integrate with other Siemens products?

It complements Siemens contactors and PLCs.

This ensures a cohesive and reliable automation solution.

Its integration fits into broader Siemens IIoT strategies.