Siemens 3RT6916-1CF00 Surge Voltage Overvoltage Protection Module

The Siemens 3RT6916-1CF00 Surge Voltage Overvoltage Protection Module is a vital component for safeguarding sensitive industrial electrical equipment from damaging transient overvoltages. This module offers robust protection with a fast response time, ensuring operational continuity and extending the lifespan of connected devices. Its key technical parameters include a rated voltage of 24V AC/DC, a maximum continuous operating voltage (Umax) of 30V AC/DC, and a nominal discharge current (In) of 5kA (8/20µs). The module boasts a voltage protection level (Up) of ≤ 0.6 kV, indicating its effectiveness in clamping surges to safe levels.

Product Specifications

| Parameter                         | Value                 |

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

| Product Type                      | Surge Voltage Module  |

| Siemens Product Number            | 3RT6916-1CF00         |

| Rated Voltage (U_N)               | 24V AC/DC             |

| Max. Continuous Operating Voltage (U_max) | 30V AC/DC             |

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

| Voltage Protection Level (U_p)    | ≤ 0.6 kV              |

| Ambient Temperature Range         | -40 °C to +85 °C      |

| Protection Type                   | Type 2 / Class II     |

| Connection Type                   | Spring-loaded terminal |

| Housing Material                  | Polycarbonate         |

| Dimensions (H x W x D)            | 89 mm x 17.5 mm x 60 mm |

Core Features & Market Positioning

The Siemens 3RT6916-1CF00 distinguishes itself through its high level of protection and compact design, crucial for space-constrained industrial control panels. As a Type 2 surge protection device, it is designed for direct connection within power distribution systems, offering an excellent balance between performance and cost-effectiveness. This module is positioned to address the increasing need for reliable protection against lightning-induced surges and switching transients in automation and control applications. Its integration into the Siemens industrial ecosystem signifies a commitment to robust, reliable, and future-proof solutions for modern industrial environments.

Key Application Scenarios

This surge voltage module finds critical applications across various industrial sectors where sensitive electronics are prevalent. It is indispensable in protecting control systems, Programmable Logic Controllers (PLCs), and human-machine interfaces (HMIs) within manufacturing plants, process industries, and building automation systems. Specifically, the 3RT6916-1CF00 is ideal for safeguarding low-voltage DC circuits, commonly found in power supplies for control devices, sensors, and actuators, against transient overvoltages that can cause data corruption or complete component failure. Its suitability for use in conjunction with Siemens' Sirius motor management system further enhances its value in motor control applications.

Practical System Integration Guidance

Integrating the Siemens 3RT6916-1CF00 is straightforward due to its DIN rail mountable design and spring-loaded terminals, facilitating quick and secure connections. For optimal performance, the module should be installed as close as possible to the equipment it is protecting, typically at the interface between the power supply and the sensitive load. Ensure correct polarity when connecting to DC circuits. The module's protective elements are connected between the live conductor(s) and ground. Proper grounding is paramount for effective surge dissipation; consult the system's grounding scheme and ensure a low-impedance path to earth. When used in series with contactors, such as Siemens 3RT2 series, it provides enhanced protection for the coil and associated electronics.

Operation and Risk Mitigation

The Siemens 3RT6916-1CF00 operates by diverting excess voltage to ground when a surge is detected, thereby clamping the voltage to a safe level (Up ≤ 0.6 kV). This rapid response prevents destructive overvoltages from reaching sensitive components. While the module itself is designed for high reliability and long service life under normal operating conditions, risk mitigation involves regular visual inspection for any signs of physical damage or overheating. Though specific fault codes are not inherent to the module, a complete loss of function or an indication of a short circuit in the protected line could suggest module failure, necessitating replacement. Adherence to the specified operating voltage (U_N = 24V AC/DC) and maximum continuous operating voltage (U_max = 30V AC/DC) is critical to prevent premature degradation or failure.

Scalability & Long-Term Value

The Siemens 3RT6916-1CF00 integrates seamlessly into existing Siemens industrial automation platforms, offering excellent scalability for evolving system requirements. Its compatibility with a wide range of Siemens components, including Sirius contactors and overload relays, allows for a cohesive and protected system architecture. For businesses looking to leverage Industry 4.0 and IIoT initiatives, integrating this surge protection module into a networked system contributes to the overall reliability and data integrity of connected assets. By preventing unexpected downtime due to electrical disturbances, it significantly contributes to the long-term operational efficiency and economic value of industrial installations.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 3RT6916-1CF00?

The primary function is to protect electrical equipment from damaging voltage spikes. It acts as a safety device.

It diverts excess electrical energy to ground. This prevents sensitive components from failing.

This module safeguards control circuits, PLCs, and HMIs in industrial settings.

What is the maximum continuous operating voltage for this module?

The maximum continuous operating voltage (Umax) is 30V AC/DC. Operating above this can lead to failure.

Exceeding Umax may cause the module to degrade over time. It can shorten its operational lifespan significantly.

Always ensure the system voltage remains below 30V AC/DC for optimal protection.

Can the 3RT6916-1CF00 be used in high-energy applications?

It's designed for Type 2 protection, suitable for standard industrial power distribution. It has a nominal discharge current of 5kA.

For very high energy events like direct lightning strikes, a Type 1 arrester might be needed upstream. This module complements such systems.

It effectively handles switching transients and moderate lightning-induced surges commonly encountered.

How do I install the Siemens 3RT6916-1CF00 module?

Installation is typically on a standard 35mm DIN rail. Use its spring-loaded terminals for secure connections.

Connect the module between the power line and ground. Ensure proper, low-impedance grounding for effectiveness.

Mount it close to the equipment being protected for the best surge clamping performance.

What is the voltage protection level (Up) of this device?

The voltage protection level (Up) is a maximum of 0.6 kV (600V). This indicates the residual voltage.

This low Up value ensures that surges are effectively limited. It keeps voltage safe for connected electronics.

A lower Up value signifies better protection for sensitive equipment.

What is the rated voltage (U_N) for the 3RT6916-1CF00?

The rated voltage (U_N) for this module is 24V AC/DC. This is the nominal operating voltage.

It is designed to operate reliably at 24V AC or 24V DC power systems. Ensure your system matches this specification.

Using it with voltages significantly higher than 24V may compromise its protective capabilities.

What does 'Type 2' protection mean for this module?

Type 2 surge protective devices are intended for installation in main distribution boards or sub-distribution boards. They handle indirect lightning effects and switching surges.

This classification means it is suitable for protecting against surges that have already been somewhat attenuated. It's a common level of protection in industrial settings.

It's designed to protect against medium levels of surge energy, offering a balance of performance and size.

What is the discharge current rating of the 3RT6916-1CF00?

The nominal discharge current (I_n) is 5 kA per pole for an 8/20 µs waveform. This is a key performance metric.

This rating signifies its capacity to safely conduct surge current to ground. It handles common industrial surge events.

While 5 kA is substantial, for extreme surge conditions, cascaded protection might be considered.

Where is the best place to install this surge protection module?

Install it as close as possible to the equipment you need to protect. This minimizes the length of unprotected wiring.

It should be installed at the point where power enters the sensitive load or control panel. This creates a protective barrier.

Proper grounding of the module and the protected equipment is crucial for effective operation.

What ambient temperature range can the 3RT6916-1CF00 operate in?

The module can operate in a wide ambient temperature range from -40 °C to +85 °C. This suits harsh industrial environments.

This broad operating temperature range ensures reliable performance across various climate conditions and industrial applications. It maintains functionality in extreme heat or cold.

Ensure the surrounding environment does not exceed these limits for optimal longevity and performance.