Siemens 3RT2023-1FB40 Industrial Grade AC Contactor 24VDC 9A 3NO

Siemens 3RT2023-1FB40: The Industrial Grade Contactor for Reliable Motor Control

The Siemens 3RT2023-1FB40 is a robust, industrial-grade AC contactor designed for demanding applications in motor control and power switching. This 3-pole contactor, part of the renowned SIRIUS 3RT series, offers a rated operational current of 9A at AC-3 (400V) and a rated power of 4kW, making it suitable for a wide range of motor loads. Its compact size S0, screw terminal connections, and a 24V DC coil voltage with an integrated diode combination for surge suppression ensure efficient and reliable operation. The integrated 1 NO + 1 NC auxiliary contacts provide essential feedback for control circuits.

Product Specifications

| Specification                     | Value                                                                   |

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

| Article Number (Market Facing)    | 3RT2023-1FB40                                                           |

| Product Description               | Power contactor, AC-3e/AC-3, 9 A, 4 kW / 400 V, 3-pole, 24 V DC           |

| Coil Voltage                      | 24 V DC                                                                 |

| Rated Operational Current (AC-3)  | 9 A                                                                     |

| Rated Power (AC-3 at 400V)        | 4 kW                                                                    |

| Poles                             | 3-pole                                                                  |

| Auxiliary Contacts                | 1 NO + 1 NC                                                             |

| Size                              | S0                                                                      |

| Connection Type                   | Screw terminal                                                          |

| Integrated Diode Combination      | Yes                                                                     |

| Rated Insulation Voltage (Ui)     | 690 V                                                                   |

| Rated Impulse Voltage (Uimp)      | 6 kV                                                                    |

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

| Mechanical Durability             | 10,000,000 operating cycles (typical)                                   |

| Degree of Protection              | IP20                                                                    |

| Compliance                        | RoHS directive, IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, VDE, UL, CSA, CE, CCC, EAC, C-Tick |

Core Features & Market Positioning

The Siemens 3RT2023-1FB40 distinguishes itself through its integration into the modular SIRIUS system, offering a compact yet high-performance solution for motor control. Its key advantage lies in its high contact reliability and the convenience of an integrated diode assembly, which suppresses voltage spikes from the coil, protecting downstream control components. This contacor is designed for fast, maintenance-free, and vibration-proof connections, a critical factor in industrial environments where downtime is costly. The SIRIUS 3RT2 series is positioned as a reliable, efficient, and up-to-date solution for switching motors, offering optimal coordination with other products in the SIRIUS lineup.

Key Application Scenarios

This Siemens 3RT2023-1FB40 contactor is primarily utilized for switching motors in Direct On-Line (DOL) starter configurations, as well as in Full-Voltage Non-Reversing (FVNR) applications. Its robust design makes it suitable for a broad spectrum of industrial sectors, including manufacturing plants, food and beverage processing, water treatment facilities, and HVAC systems, wherever reliable and safe control of electric motors is paramount. It is an integral component in automated production lines, pump control systems, conveyor systems, and other machinery requiring consistent and dependable power switching.

Practical System Integration Guidance

Integrating the Siemens 3RT2023-1FB40 into an electrical system is straightforward due to its standard S0 size and screw terminal connections, facilitating quick and secure wiring. The 24V DC coil voltage allows for direct integration with low-voltage control systems and programmable logic controllers (PLCs). The presence of an integrated diode assembly simplifies wiring by eliminating the need for an external suppressor for the coil. For panel builders and system integrators, Siemens offers a range of complementary components within the SIRIUS modular system, such as overload relays and communication modules, which can be easily combined with this contactor to create complete motor feeders. The device supports various mounting options, including DIN rail or surface mounting, offering flexibility in control cabinet design.

Operation and Risk Mitigation

Safe operation of the Siemens 3RT2023-1FB40 requires adherence to electrical installation standards and best practices. The contactor is designed with an IP20 enclosure, meaning it provides protection against solid objects greater than 12.5mm but is not protected against water. It is crucial to ensure proper wiring and to isolate power before performing any maintenance or inspection. While the integrated diode assembly mitigates some electrical risks associated with coil switching, users should still be aware of potential hazards related to high currents and voltages present in motor circuits. For troubleshooting, common issues might involve the coil not energizing or contacts failing to close, which could be due to incorrect voltage supply, wiring errors, or mechanical issues. Always refer to the official Siemens documentation for detailed troubleshooting steps and error code interpretations.

Scalability & Long-Term Value

The Siemens 3RT2023-1FB40 benefits from its place within the broader SIRIUS ecosystem, allowing for seamless integration with other Siemens automation components. Its modular design supports future upgrades and expansions; for instance, auxiliary switch blocks can be added to expand the number of control contacts, and communication modules can be integrated for enhanced diagnostics and connectivity within Industrial Internet of Things (IIoT) frameworks. This inherent scalability ensures that the contactor remains a valuable component in evolving industrial automation architectures, supporting digital transformation initiatives and IIoT integration for predictive maintenance and remote monitoring.

Frequently Asked Questions (FAQs)

Q1: What is the primary function of the Siemens 3RT2023-1FB40?

The Siemens 3RT2023-1FB40 is an industrial-grade power contactor. It's designed to switch electrical loads, most commonly to start and stop electric motors in industrial applications.

This device acts as a heavy-duty relay, controlled by a low-voltage DC coil. It enables remote or automated control of higher-power circuits.

Its key role is to safely and reliably connect or disconnect power to equipment like motors, pumps, and fans.

Q2: What are the key technical specifications of the 3RT2023-1FB40?

This contactor has a 3-pole configuration with a 9A rating for AC-3 motor control at 400V. It can handle up to 4kW of motor power.

The coil operates on 24V DC and features an integrated diode for surge suppression. It includes one normally open (NO) and one normally closed (NC) auxiliary contact.

The unit is size S0, with screw terminal connections, and an IP20 protection rating.

Q3: In which applications is the Siemens 3RT2023-1FB40 typically used?

It is predominantly used for switching three-phase induction motors in Direct On-Line (DOL) starters. These are common in manufacturing and process industries.

The contactor is also suitable for Full-Voltage Non-Reversing (FVNR) applications, offering reliable control for various industrial machinery.

Typical uses include motor control for pumps, fans, conveyors, compressors, and other equipment requiring robust switching.

Q4: What does the integrated diode combination on the 3RT2023-1FB40 do?

The integrated diode combination acts as a surge suppressor for the DC control coil. When the coil is de-energized, it can generate a back EMF (electromotive force).

This diode provides a path for that induced voltage to dissipate safely, preventing voltage spikes. These spikes could otherwise damage sensitive electronic control circuits.

This feature simplifies wiring by eliminating the need for an external suppressor, enhancing reliability and reducing installation complexity.

Q5: How does the 3RT2023-1FB40 integrate with automation systems?

The 3RT2023-1FB40 is part of Siemens' SIRIUS modular system, designed for easy integration. It can be directly wired to PLCs using its 24V DC coil.

Auxiliary contacts provide crucial feedback signals (e.g., contact status) to automation controllers for monitoring and interlocks.

Siemens offers accessories like communication modules (e.g., IO-Link) that can be added for advanced digital integration and diagnostics within Industry 4.0 environments.

Q6: What is the significance of the 'S0' size designation?

The 'S0' designation refers to the physical size and power handling capacity of the contactor within the Siemens SIRIUS system. Size S0 is a mid-range size.

This size is optimized for its current and power ratings (9A, 4kW), offering a balance between performance and a compact footprint for control panels.

It ensures compatibility with other SIRIUS components of the same size, facilitating the creation of standardized motor feeders.

Q7: What is the difference between AC-3 and AC-1 ratings?

AC-3 rating is specific to the starting of three-phase induction motors. It accounts for the high inrush current during motor start-up.

AC-1 rating applies to the switching of non-inductive or slightly inductive loads, such as resistive heaters. It represents a higher current carrying capacity for continuous operation of such loads.

For the 3RT2023-1FB40, the AC-3 rating is 9A, while its AC-1 rating is 40A, indicating its primary application is motor control.

Q8: Can auxiliary contacts be added to the 3RT2023-1FB40?

Yes, auxiliary contacts can be added to this contactor. It comes standard with 1 NO and 1 NC auxiliary contacts.

Additional auxiliary switch blocks can be mounted on the front or side of the contactor. This expands the number of available control or feedback contacts.

These additional contacts are crucial for more complex control logic, signaling, and interlocking schemes in automation systems.

Q9: What are the environmental and safety considerations for this contactor?

The contactor has an IP20 enclosure, suitable for indoor use in environments protected from dust and moisture. It operates reliably between -25°C and +60°C.

It complies with RoHS directives regarding hazardous substances, although it contains lead above 0.1%. Proper disposal procedures should be followed.

Installation should only be performed by qualified electrical personnel, following all relevant safety standards and local regulations.

Q10: What is the lifespan or mechanical durability of the 3RT2023-1FB40?

The mechanical durability of this contactor is typically rated at 10 million operating cycles. This refers to the number of times the contactor can open and close without its mechanical components failing.

Electrical durability depends heavily on the load conditions (e.g., motor type, frequency of switching, power factor) and environmental factors.

For applications with frequent switching or high electrical stress, periodic inspection and maintenance are recommended to ensure continued reliable operation.