Siemens 3RT1956-1CD00 Contactor Surge Suppression Protection Module

The Siemens 3RT1956-1CD00 is an RC element surge suppression module designed for use with Siemens 3RT1 S6, S10, and S12 series contactors featuring screw terminals. This module plays a crucial role in protecting control circuits from transient voltage spikes, thereby enhancing the longevity and reliability of connected equipment. Its primary advantages lie in its simple yet effective design, offering robust protection against electrical noise and overvoltage conditions. Key technical parameters include a rated control supply voltage range of 127-240V AC at 50/60Hz, and 150-250V DC, with a voltage type for actuation that is AC/DC compatible. The module is compact, with dimensions of 70.00 x 35.00 x 28.00 mm and a weight of approximately 0.031 Kg, making it easy to integrate into existing control panels.

Product Specifications

| Specification                   | Value                                         |

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

| Product Number                  | 3RT1956-1CD00                                 |

| Product Category                | Surge suppressor                              |

| Product Designation             | RC element                                    |

| Compatibility                   | 3RT1 S6, S10, S12 contactors (screw terminal) |

| Rated Control Supply Voltage AC | 127-240 V (50/60 Hz)                          |

| Rated Control Supply Voltage DC | 150-250 V                                     |

| Voltage Type                    | AC/DC                                         |

| Dimensions (H x W x D)          | 70.00 x 35.00 x 28.00 mm                      |

| Weight                          | Approx. 0.031 Kg                              |

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

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

Core Features & Market Positioning

The Siemens 3RT1956-1CD00 stands out in the industrial automation market as a reliable and cost-effective solution for transient voltage suppression. Its positioning is that of a vital accessory for Siemens' established SIRIUS 3RT1 contactor range, offering seamless integration and ensuring operational integrity. Unlike more complex surge protection devices, this RC element provides essential protection without unnecessary features, making it a preferred choice for applications where simplicity and direct-circuit protection are paramount. Its core strength lies in its ability to absorb voltage peaks generated by inductive loads, a common issue in motor control circuits, thus preventing premature failure of contactor coils and associated control electronics.

Key Application Scenarios

The primary application for the Siemens 3RT1956-1CD00 is in industrial control systems where Siemens SIRIUS 3RT1 series contactors (specifically S6, S10, and S12 with screw terminals) are employed. This includes motor control circuits for pumps, fans, conveyors, and other machinery in manufacturing plants, processing facilities, and building automation systems. By suppressing voltage spikes, it protects the contactor coil from premature burnout and ensures stable operation of the control circuitry, crucial in applications requiring high uptime and reliability. It is particularly beneficial in environments with significant electrical noise or frequent switching of inductive loads.

Practical System Integration Guidance

Integrating the Siemens 3RT1956-1CD00 is straightforward due to its design as a direct accessory for the specified contactors. It typically mounts directly onto the front of the contactor or in close proximity, connecting in parallel with the control circuit terminals of the contactor. Users should ensure the voltage ratings of the module align with the control voltage of the contactor being used (127-240V AC or 150-250V DC). Proper wiring is essential to ensure the RC element effectively shunts transient voltages. No specific programming is required, as it functions passively to absorb voltage spikes.

Operation and Risk Mitigation

The 3RT1956-1CD00 operates by absorbing the energy from transient overvoltages, typically generated when inductive loads like motor coils are switched off. The RC (Resistor-Capacitor) network within the module effectively dampens these voltage spikes, preventing them from reaching sensitive control components. This directly mitigates the risk of premature contactor coil failure, electrical arcing, and potential damage to other control devices connected to the same power supply. While generally very reliable, users should periodically inspect connections and ensure the operating environment remains within the specified temperature range (-25 to +60 °C) to maintain optimal performance and safety.

Scalability & Long-Term Value

While the 3RT1956-1CD00 is a specific accessory for certain 3RT1 contactors, its long-term value is realized through the extended operational lifespan it provides to the protected contactors and control systems. By preventing premature failures, it reduces costly downtime and maintenance expenses. Its compatibility with established Siemens SIRIUS platforms means it aligns with a robust ecosystem of industrial control components, allowing for consistent and reliable system design. Although not directly a "scalable" product in terms of feature expansion, its effective protection ensures the foundational reliability of the control circuits it serves, contributing to the overall longevity and performance of the industrial setup.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 3RT1956-1CD00?

This module acts as a surge suppressor, specifically an RC element, designed to protect the control circuits of Siemens 3RT1 series contactors. It absorbs transient voltage spikes.

It mitigates risks associated with switching inductive loads, preventing damage to contactor coils. This ensures enhanced reliability and operational lifespan for the connected equipment.

The device is crucial for maintaining stable control system performance in industrial environments.

What types of contactors is the Siemens 3RT1956-1CD00 compatible with?

The module is designed for Siemens 3RT1 series contactors, specifically models S6, S10, and S12.

It is intended for use with contactors that feature screw terminals for connections.

Always verify the specific contactor model and terminal type before installation to ensure compatibility.

What are the voltage ratings for the Siemens 3RT1956-1CD00?

The module supports AC control supply voltages ranging from 127 to 240V at both 50Hz and 60Hz frequencies.

For DC control circuits, it accommodates voltages between 150V and 250V.

This dual AC/DC capability makes it versatile for various control system configurations.