Siemens 3RT6024-1AN20 Standard Motor Control Unit Contactor 220VAC 12A 3NO

The Siemens 3RT6024-1AN20 is a robust, 3-pole standard motor control unit contactor designed for reliable switching of electrical loads. This industrial-grade component operates on a 220VAC coil voltage, features a 12A current rating at AC-3 utilization category, and is equipped with 3 normally open (NO) auxiliary contacts. Its compact size S0 and screw terminal connections facilitate straightforward integration into control panels.

Product Specifications

| Feature                          | Specification                                  |

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

| Product Number                   | 3RT6024-1AN20                                  |

| Brand                            | Siemens                                        |

| Series                           | SIRIUS 3RT60                                   |

| Type                             | Standard Motor Control Unit Contactor          |

| Poles                            | 3                                              |

| Coil Voltage                     | 220 VAC, 50/60 Hz                              |

| Current Rating (AC-3)            | 12 A (at 400 V)                                |

| Power Rating (AC-3)              | 5.5 kW (at 400 V)                              |

| Auxiliary Contacts               | 3 NO (3RT6024-1AN20 inherently has 3 NO, this differs from some other 3RT60 models that might list 1NO+1NC or require additional blocks) |

| Terminal Type                    | Screw Terminal                                 |

| Size                             | S0                                             |

| Mounting                         | 35 mm DIN rail / Vertical                      |

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

| Storage Temperature              | -55 °C to +80 °C                               |

| IP Rating                        | IP20                                           |

| Compliance                       | RoHS, IEC/EN 60947-1/60947-4-1/60947-5-1, VDE |

| Net Weight                       | 0.390 Kg                                       |

| Packaging Dimensions (L x W x H) | 105.00 x 90.00 x 51.00 mm                      |

Core Features & Market Positioning

The Siemens 3RT6024-1AN20 stands out in the competitive industrial control market due to its robust construction, adherence to stringent international standards, and the trusted SIRIUS brand reputation. As a standard product, it offers a balance of performance and cost-effectiveness, making it a popular choice for general-purpose motor control applications. Its design prioritizes reliability and operational longevity, crucial factors for industrial environments where downtime is costly. The unit's inherent 3 normally open auxiliary contacts provide immediate expandability for control circuits without requiring additional blocks, simplifying panel design and reducing component count. This product is positioned as a dependable workhorse for essential motor switching tasks.

Key Application Scenarios

The Siemens 3RT6024-1AN20 is ideally suited for a wide array of industrial applications. Its primary function is the direct control of standard three-phase induction motors in the power range up to 5.5 kW at 400V. Common use cases include:

  Machine Tools: Controlling spindle motors, feed drives, and auxiliary equipment.  Conveyor Systems: Managing motor operation for belt and roller conveyors.  HVAC Systems: Switching fans, pumps, and compressors in industrial climate control.  Material Handling: Powering lifting mechanisms, automated guided vehicles (AGVs), and other processing equipment.  General Automation: Acting as a reliable switch in various automated production lines and process controls.

The contactor's ability to handle AC-3 loads signifies its suitability for motor starting applications where higher inrush currents are encountered.

Practical System Integration Guidance

Integrating the Siemens 3RT6024-1AN20 into existing control systems is streamlined by its standard S0 size and screw terminals. For DIN rail mounting, ensure the rail is securely fastened; the contactor clips onto the rail, typically by first engaging the spring-loaded end. Wiring the main power circuit involves connecting the three phases to the line-side terminals and the motor to the load-side terminals. Ensure proper torque is applied to the screw terminals according to manufacturer specifications to guarantee a secure connection and prevent overheating. The 220VAC coil voltage requires a corresponding power supply. For applications requiring overload protection, the 3RT6024-1AN20 is designed to be paired with Siemens 3RU overload relays or other compatible protection devices, which are typically mounted directly below the contactor. The integrated 3NO auxiliary contacts can be wired into control circuits for status feedback, interlocking, or signaling purposes.

Operation and Risk Mitigation

The Siemens 3RT6024-1AN20 operates by using a 220VAC coil to create a magnetic field that closes the main power contacts, thereby energizing the motor or load. Conversely, de-energizing the coil opens the contacts, disconnecting the load. To ensure safe operation, always de-energize and lockout the control circuit before performing any maintenance or wiring. The IP20 enclosure rating means the unit is protected against solid objects greater than 12.5mm but is not protected against water ingress; therefore, it should be installed in a clean, dry environment or within a suitable enclosure. While the product is RoHS compliant, indicating a restriction on certain hazardous substances, adherence to general electrical safety practices, including proper grounding and insulation, is paramount. Troubleshooting typically involves checking coil voltage, contact continuity, and verifying that the auxiliary circuits are correctly wired. Faults like contact welding or coil burnout are rare but can occur due to severe overloads or voltage fluctuations.

Scalability & Long-Term Value

The SIRIUS 3RT60 contactor series offers excellent scalability. While the 3RT6024-1AN20 is a standard component, it is part of a broader range of Siemens motor control solutions. This allows for straightforward upgrades to higher current or power ratings by selecting larger frame sizes within the SIRIUS family if motor loads increase. Furthermore, Siemens' commitment to industrial interoperability means that components like the 3RT6024-1AN20 can often be integrated into larger automation systems, including those leveraging Industrial Internet of Things (IIoT) capabilities, through compatible gateways and communication modules. The availability of spare parts and the established support network for Siemens industrial products ensure long-term value and maintainability for facilities relying on this contactor.

Frequently Asked Questions

What is the primary function of the Siemens 3RT6024-1AN20?

The Siemens 3RT6024-1AN20 is a contactor, a heavy-duty electromagnetically operated switch. Its main function is to switch an electrical power circuit on or off, typically used for controlling electric motors in industrial settings. It provides a remote control capability for high-power loads.

This device acts as a high-power relay, allowing a low-power control signal to manage a high-power circuit. It's designed for frequent switching operations and offers a robust solution for motor starting and stopping.

The 3RT6024-1AN20 specifically is rated for 12A at AC-3 utilization and is designed for 220VAC coil operation. It features 3 normally open auxiliary contacts.

What type of motors can the 3RT6024-1AN20 control?

This contactor is rated for controlling standard three-phase induction motors. Its AC-3 rating signifies its suitability for motor starting applications.

It can handle motor loads up to 5.5 kW at 400V. This makes it appropriate for a wide range of industrial machinery.

Always consult the motor's nameplate and the contactor's datasheet to ensure compatibility for current, voltage, and power ratings.

How do I wire the Siemens 3RT6024-1AN20?

Wiring involves connecting the incoming power supply to the line-side terminals and the motor to the load-side terminals. The 220VAC coil needs a separate control voltage supply.

Ensure proper torque is applied to the screw terminals for secure connections. The three NO auxiliary contacts can be used for control logic, feedback, or interlocks.

For overload protection, a compatible Siemens overload relay (e.g., 3RU series) should be installed directly below the contactor.

What are the key technical specifications of the 3RT6024-1AN20?

Key specifications include a 220VAC coil voltage, a 12A current rating (AC-3), and 3 normally open auxiliary contacts. It is a 3-pole contactor in size S0.

The device operates within a temperature range of -25°C to +60°C during operation. It features screw terminals for easy connection.

It is compliant with RoHS directives and various international standards like IEC/EN 60947.

Can the Siemens 3RT6024-1AN20 be used for DC loads?

No, the Siemens 3RT6024-1AN20 is designed specifically for AC (Alternating Current) loads. Its coil is also AC-powered.

Using this contactor on DC circuits could lead to damage, malfunction, or unsafe conditions. DC arc suppression is different from AC, and this unit is not equipped for it.

For DC applications, a different type of contactor or relay designed for DC switching would be required.

What is the purpose of the auxiliary contacts on the 3RT6024-1AN20?

The auxiliary contacts are low-power contacts that operate in conjunction with the main power contacts. They are used for control, signaling, and interlocking purposes.

The 3RT6024-1AN20 features three normally open (NO) auxiliary contacts. These contacts close when the main coil is energized.

They can be wired into control circuits to indicate the contactor's state, prevent conflicting operations, or trigger other control logic.

How is the Siemens 3RT6024-1AN20 mounted?

This contactor is designed for mounting on a standard 35mm DIN rail. It can be mounted vertically or horizontally.

Installation typically involves clipping the unit onto the DIN rail. The specific method may involve engaging a spring-loaded clip on one end first.

Ensure the DIN rail is securely mounted in the control panel for stable installation.

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

AC-1 is a general-purpose rating for non-inductive or slightly inductive loads, such as resistive heaters. AC-3 is specifically for starting squirrel-cage motors and includes considerations for higher inrush currents.

The 3RT6024-1AN20 has a higher current rating for AC-1 (40A) compared to AC-3 (12A) because motor starting current is much higher than steady-state running current.

It is crucial to select the correct rating based on the intended application to ensure reliable operation and prevent premature failure.

Is the Siemens 3RT6024-1AN20 RoHS compliant?

Yes, the Siemens 3RT6024-1AN20 is compliant with RoHS (Restriction of Hazardous Substances) directives.

This means it adheres to regulations that limit the use of specific hazardous materials in its manufacturing.

RoHS compliance is an important environmental and safety consideration for electrical and electronic equipment.

What is the expected mechanical lifespan of this contactor?

The Siemens 3RT6024-1AN20 has a typical mechanical service life of 10 million operating cycles.

This figure represents the number of times the contactor can open and close its internal mechanisms without mechanical failure.

Electrical life depends heavily on the load being switched and the frequency of operation. Proper application and protection will maximize its electrical service life.