Siemens 3RT6023-1BB40 Motor Control Auxiliary Contact Contactor 24VDC 9A 3NO

The Siemens 3RT6023-1BB40 is a high-performance motor control auxiliary contactor designed for reliable and efficient operation in demanding industrial environments. This 24VDC, 9A, 3NO (normally open) contactor offers robust switching capabilities, ensuring the safe and precise control of electric motors. Its compact design, coupled with Siemens' renowned engineering excellence, makes it a preferred choice for applications requiring dependable auxiliary switching functions within motor control circuits. Key advantages include its high switching frequency, long electrical service life, and seamless integration into existing Siemens control systems.

Product Specifications

| Feature             | Specification        |

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

| Product Type        | Auxiliary Contact    |

| Manufacturer        | Siemens              |

| Model Number        | 3RT6023-1BB40        |

| Coil Voltage        | 24V DC               |

| Rated Operational Current (AC-15, 380/400V) | 9 A                |

| Number of NO Contacts | 3                    |

| Number of NC Contacts | 0                    |

| Auxiliary Circuit Type | NO (Normally Open)   |

| Mounting Type       | Rail mount, Screw mount |

| Terminal Type       | Screw terminals      |

| Protection Rating   | IP20                 |

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

| Dimensions (H x W x D) | 85.5 x 45 x 97.5 mm  |

Core Features & Market Positioning

The Siemens 3RT6023-1BB40 distinguishes itself through its superior reliability and durability, hallmarks of the Siemens brand in industrial automation. Its robust construction and high-quality components ensure consistent performance even under heavy operational loads and challenging environmental conditions. The 24VDC coil voltage is a common standard in many control systems, facilitating straightforward integration. This auxiliary contactor is positioned as a dependable solution for extending the functionality of main contactors or for independent switching tasks within motor starters and control panels, offering a cost-effective yet high-quality option compared to less established brands. Its compatibility with other Siemens SIRIUS components further enhances its market appeal for integrated solutions.

Key Application Scenarios

This Siemens 3RT6023-1BB40 auxiliary contactor is ideally suited for a wide array of motor control applications across various industries, including manufacturing, material handling, and building automation. It frequently serves as an additional contact for feedback signals in motor starters, allowing control systems to monitor the status of the main contactor. It is also employed in interlocking circuits to prevent simultaneous activation of opposing functions, enhancing operational safety. Furthermore, it can be utilized for signaling purposes, such as indicating when a motor is running or when a specific control circuit is energized. Its 3 normally open contacts provide flexibility for diverse wiring configurations in control cabinets.

Practical System Integration Guidance

Integrating the Siemens 3RT6023-1BB40 into existing control systems is typically a streamlined process due to its standard form factor and terminal layout. Installation involves securely mounting the contactor onto a 35mm DIN rail or using screw terminals for fixed applications. Wiring the 24VDC coil is straightforward, requiring connection to the appropriate power source and control signal. The auxiliary contacts can be wired in parallel with the main contactor's power poles to provide status feedback or integrated into logic circuits for interlocking and sequencing. Always ensure the power supply is de-energized before making any electrical connections to prevent shock hazards. Compatibility with other SIRIUS components simplifies the design and wiring of complex motor control assemblies.

Operation and Risk Mitigation

The Siemens 3RT6023-1BB40 operates by magnetically actuating its internal contacts when the 24VDC coil is energized. The three normally open (NO) contacts close, allowing current to flow through them. Conversely, when the coil is de-energized, the contacts revert to their open state. To mitigate risks, it is crucial to adhere to the specified operational voltage of 24VDC and ensure the connected load does not exceed the contactor's 9A rating. Proper electrical enclosure and protection against dust and moisture (IP20 rating) are essential to prevent short circuits and ensure longevity. Regular visual inspection for signs of wear or damage is recommended as part of a preventive maintenance schedule to avoid unexpected failures.

Scalability & Long-Term Value

The Siemens 3RT6023-1BB40 auxiliary contactor offers excellent long-term value through its inherent reliability and compatibility within the broader Siemens automation ecosystem. While this specific unit is a dedicated auxiliary contact, its integration capability with Siemens' SIRIUS line of motor starters, circuit breakers, and overload relays allows for scalable and expandable motor control solutions. For more complex requirements, additional auxiliary contact blocks can often be added to compatible main contactors, or entirely new control modules can be incorporated. Its robust design ensures a long operational life, minimizing the need for frequent replacements and contributing to overall system uptime and reduced maintenance costs. Integration with modern IIoT platforms is facilitated through associated intelligent devices and gateways within the Siemens portfolio.

Frequently Asked Questions

What is the primary function of the Siemens 3RT6023-1BB40?

The Siemens 3RT6023-1BB40 acts as an auxiliary contactor, primarily used to extend the control capabilities of main contactors or for independent switching tasks. It provides three normally open (NO) contacts that close when its 24VDC coil is energized. This allows it to be used for signaling motor status, implementing interlocking logic, or controlling secondary circuits within motor control systems.

This auxiliary contactor is essential for feedback loops, informing a control system whether a main contactor has successfully engaged. Its inclusion enhances system visibility and diagnostics, aiding in troubleshooting and operational monitoring. The 3NO configuration offers flexibility for multiple simultaneous control signals or interlock paths, making it a versatile component in complex electrical assemblies.

Its typical use cases include providing a "contactor on" signal, enabling safety interlocks between motor drives, or activating auxiliary equipment only when a primary motor circuit is active. The 24VDC coil voltage is a standard in many industrial control panels, ensuring easy integration with existing power supplies and control logic.

How do I wire the Siemens 3RT6023-1BB40 auxiliary contactor?

Wiring the Siemens 3RT6023-1BB40 involves connecting the control voltage to the coil terminals and integrating the auxiliary contacts into your circuit. The coil is typically marked with "A1" and "A2" for the 24VDC supply. Ensure correct polarity if your system requires it, although many DC coils are not polarity sensitive for basic function.

The three normally open (NO) auxiliary contacts are usually found on the front of the unit. These contacts are closed when the coil is energized. You will wire these contacts in series or parallel with other control components according to your specific application requirements, such as signaling or interlocking.

Always refer to the wiring diagram provided with the product or available from Siemens for precise terminal identification and recommended connection practices. It is critical to disconnect all power before initiating any wiring to prevent electrical shock and equipment damage.

What are the key technical specifications of the Siemens 3RT6023-1BB40?

The Siemens 3RT6023-1BB40 features a 24VDC coil voltage, making it suitable for low-voltage DC control circuits. It has a rated operational current of 9A, typically specified for AC-15 duty at 380/400V, indicating its capacity for switching control circuits. The contactor is equipped with three normally open (NO) auxiliary contacts.

This unit is designed for easy mounting, commonly on a 35mm DIN rail or via screw terminals, and features robust screw terminals for secure electrical connections. It has an IP20 protection rating, meaning it is protected against solid objects greater than 12.5mm but offers no protection against water ingress.

The operating temperature range is between -25°C and +60°C, suitable for most industrial environments. Its compact dimensions (approx. 85.5 x 45 x 97.5 mm) allow for space-saving installation within control panels.