Siemens 6EP1961-3BA21 SITOP Power Buffer Module for UPS Applications

The Siemens 6EP1961-3BA21 SITOP Power Buffer Module is engineered to provide robust, reliable power for critical industrial applications, functioning as an uninterruptible power supply (UPS) solution. This module excels in bridging short-term mains failures and voltage dips, ensuring continuous operation of sensitive loads and preventing costly downtime. Key advantages include its compact design, high efficiency, and seamless integration with Siemens SITOP power supplies. Core features encompass a high buffering capacity, rapid response time, and comprehensive diagnostics. Technical parameters highlight an input voltage range of 24V DC, a maximum output current of 40A, and an impressive buffering time of up to 10 seconds at nominal load, making it an indispensable component for maintaining operational integrity in demanding environments.

Product Specifications

| Feature                 | Specification                                  |

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

| Product Number          | 6EP1961-3BA21                                  |

| Product Type            | SITOP Power Buffer Module                      |

| Application             | UPS Functionality                              |

| Input Voltage           | 24V DC                                         |

| Output Voltage          | 24V DC                                         |

| Max. Output Current     | 40A                                            |

| Buffering Time          | Up to 10s at nominal load                      |

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

| Dimensions (WxHxD)      | 62mm x 125mm x 130mm                           |

| Protection Class        | IP20                                           |

| Mounting                | DIN rail                                       |

Core Features & Market Positioning

The Siemens 6EP1961-3BA21 SITOP Power Buffer Module distinguishes itself through its sophisticated capacitor-based energy storage, offering a maintenance-free UPS solution that surpasses traditional battery-based systems in terms of longevity and environmental resistance. Its unique selling proposition lies in its ability to deliver high currents instantaneously during power interruptions, ensuring that critical processes, such as programmable logic controllers (PLCs) and control systems, remain operational without interruption. This positions it as a premium choice for industries where uptime is paramount and the cost of an unplanned shutdown far outweighs the investment in reliable power protection. The module's compatibility with the broader SITOP portfolio further enhances its market appeal, allowing for a cohesive and scalable power supply architecture.

Key Application Scenarios

This Siemens SITOP power buffer module is ideally suited for applications demanding high availability, including industrial automation, process control, and critical infrastructure monitoring. It is frequently deployed to safeguard data acquisition systems, emergency shutdown systems, and safety-critical equipment in sectors such as manufacturing, oil and gas, and utilities. Users often search for solutions to prevent data loss during brief power glitches, ensure continuous operation of conveyor systems, or maintain communication links in remote facilities. The 6EP1961-3BA21 effectively addresses these needs by providing immediate backup power, thereby preventing cascading failures and maintaining the integrity of complex operational sequences.

Practical System Integration Guidance

Integrating the Siemens 6EP1961-3BA21 into an existing power system is straightforward, primarily involving its connection in series between a SITOP power supply and the DC load. The module utilizes standard 24V DC input and output terminals, simplifying wiring. For optimal performance, it is recommended to connect it directly to the output of a SITOP power supply, ensuring that the power supply can adequately charge the buffer module's internal capacitors. No complex programming is required for basic UPS functionality; however, diagnostic signals (e.g., for "buffer active" or "buffer discharged") can be integrated into a PLC's monitoring system for advanced fault detection and reporting. Ensure appropriate fusing and cable cross-sections are used according to local electrical codes and the module's specifications to maintain safety and performance.

Operation and Risk Mitigation

The 6EP1961-3BA21 operates autonomously once charged by the primary 24V DC power supply. During a mains failure, it seamlessly discharges its stored energy to maintain the 24V DC output, typically for several seconds, allowing for controlled shutdown sequences or uninterrupted operation until primary power is restored. Risk mitigation is inherent in its design, reducing the likelihood of data corruption or mechanical damage caused by sudden power loss. While the module itself is highly reliable, users should be aware of its operational limits, particularly ambient temperature and continuous load, to prevent premature component degradation. Proper ventilation and adherence to the specified operating temperature range are crucial. Fault indicators on the module provide immediate status feedback, aiding in prompt issue identification.

Scalability & Long-Term Value

The scalability of the Siemens 6EP1961-3BA21 is achieved through its modular design and compatibility with other SITOP units. While the module itself offers a fixed buffering capacity, multiple power supplies can be paralleled to increase overall system capacity, and additional buffer modules can be added in parallel if longer buffering times are required (though this requires specific engineering considerations). Its long-term value is underscored by its maintenance-free capacitor technology, eliminating the recurring costs and environmental concerns associated with battery replacement. Furthermore, its integration into Siemens' broader industrial automation ecosystem, including potential connectivity with TIA Portal and MindSphere for IIoT applications, ensures its relevance and continued contribution to smart, connected industrial environments.

Frequently Asked Questions

What is the primary function of the Siemens 6EP1961-3BA21?

The Siemens 6EP1961-3BA21 serves as a power buffer module designed for UPS applications. It bridges short mains failures and voltage dips. This ensures continuous operation of critical 24V DC loads.

How does the 6EP1961-3BA21 provide UPS functionality?

It utilizes internal capacitors to store energy. When the primary 24V DC supply fails, it discharges this energy. This maintains the output voltage for a specified period.

What are the key benefits of using this buffer module over traditional UPS systems?

This module offers a maintenance-free operation due to its capacitor technology. It boasts a longer service life and is more resistant to temperature fluctuations than battery-based UPS. It also provides a faster response time.

What is the maximum buffering time for the 6EP1961-3BA21?

The module provides up to 10 seconds of buffering at its nominal load. This duration is sufficient for controlled shutdowns or bridging brief power interruptions. Actual time depends on the load current.

How is the 6EP1961-3BA21 integrated into a power system?

It connects in series between a 24V DC SITOP power supply and the load. Ensure correct polarity and adequate conductor sizing. It requires no complex configuration.

What kind of loads can be protected by this SITOP power buffer?

Critical 24V DC loads such as PLCs, sensors, and control systems can be protected. It is ideal for applications where even momentary power loss is unacceptable. It ensures process continuity.

Does the 6EP1961-3BA21 require any special maintenance?

No, the capacitor technology means it is virtually maintenance-free. Unlike batteries, there's no need for periodic replacement or specific storage conditions. This reduces operational costs.

What diagnostic capabilities does the 6EP1961-3BA21 offer?

It provides status signals for 'buffer active' and 'buffer discharged'. These signals can be integrated into a PLC's monitoring system. This allows for proactive fault detection and reporting.

What is the operating temperature range of this SITOP module?

The module operates reliably within a wide temperature range of -25°C to +60°C. This makes it suitable for harsh industrial environments. Ensure proper ventilation.

Can the buffering time be extended with the 6EP1961-3BA21?

Extending buffering time typically involves using larger capacity buffer modules or multiple units in parallel. Engineering considerations are crucial for such configurations. Consult Siemens documentation for specifics.