Siemens 3RT6015-1AN21 400V Coil Standard Voltage Contactor 220VAC 7A 3NO

The Siemens 3RT6015-1AN21 is a robust 400V coil standard voltage contactor designed for reliable power control in demanding industrial environments. This 220VAC unit boasts a 7A rating and three normally open (NO) contacts, making it an ideal choice for a wide array of switching applications. Its core advantages lie in its compact design, superior switching performance, and Siemens' renowned reliability, ensuring seamless integration into both new and existing control systems.

Siemens 3RT6015-1AN21: Product Specifications

| Feature                  | Specification                      |

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

| Product Type             | Standard Voltage Contactor         |

| Manufacturer             | Siemens                            |

| Model Number             | 3RT6015-1AN21                      |

| Coil Voltage             | 220VAC                             |

| Rated Current (AC-3)     | 7A                                 |

| Number of NO Contacts    | 3                                  |

| Number of NC Contacts    | 0                                  |

| Auxiliary Contacts       | 1 NO + 1 NC (optional, not standard) |

| Control Circuit Voltage  | 400V (for coil power, not control) |

| Mounting Type            | DIN Rail                           |

| Protection Class         | IP20                               |

| Ambient Operating Temp.  | -25 to +60 °C                      |

| Terminal Type            | Screw Terminals                    |

Core Features & Market Positioning

The Siemens 3RT6015-1AN21 distinguishes itself through its compact footprint, a critical factor in panel building where space is at a premium. This 7A contactor leverages Siemens' extensive experience in industrial control, offering a high degree of operational stability and longevity. Its design prioritizes ease of wiring and maintenance, reducing installation time and potential for errors on the factory floor. In the competitive landscape of industrial contactors, the 3RT6015-1AN21 is positioned as a dependable, cost-effective solution for general-purpose motor control and switching tasks, backed by the trusted Siemens brand.

Key Application Scenarios

This Siemens contactor is widely employed in motor control circuits for starting, stopping, and reversing three-phase motors up to its rated capacity. It is a staple in HVAC systems for controlling fans and compressors, in pump control applications, and within conveyor systems for precise material handling. Machine tool manufacturers frequently specify the 3RT6015-1AN21 for controlling auxiliary equipment such as lighting, heating elements, and control circuits requiring reliable switching. Its suitability extends to general power switching in industrial automation, building automation, and various power distribution panels.

Practical System Integration Guidance

Integrating the Siemens 3RT6015-1AN21 into control systems is straightforward. The contactor is designed for direct mounting on a standard 35mm DIN rail, simplifying mechanical installation. Electrical connections are made via screw terminals, which provide a secure and reliable connection for both the power circuit and the 220VAC coil. For motor control, the power terminals (typically L1, L2, L3 and T1, T2, T3) are connected in series with the motor's power supply, while the coil terminals (A1, A2) are connected to the 220VAC control voltage source. Ensuring the control voltage precisely matches the 220VAC coil rating is paramount for correct operation and to prevent coil damage.

Operation and Risk Mitigation

The 3RT6015-1AN21 operates by energizing its 220VAC coil, which generates a magnetic field that pulls in an armature, closing the three normally open power contacts. When the coil is de-energized, a spring returns the armature, opening the contacts. Safe operation requires adherence to local electrical codes and proper enclosure of the contactor to prevent accidental contact with live parts. Overloading the contactor beyond its 7A AC-3 rating can lead to premature contact wear, coil overheating, or failure. Regular visual inspection for signs of wear or damage, along with periodic testing of its switching function, are recommended mitigation strategies. Ensure the control circuit is properly fused to protect against short circuits.

Scalability & Long-Term Value

The Siemens 3RT6015-1AN21 offers a degree of scalability through its compatibility with other Siemens industrial control components, such as overload relays and control switches, which can be directly mounted to the front of the contactor. This modularity allows for the creation of complex motor control assemblies. While the 3RT6015-1AN21 itself is a discrete component, its integration into larger Siemens control platforms, like SIMATIC PLCs, facilitates its participation in more advanced automation and IIoT strategies. The inherent durability and high switching cycles of Siemens contactors ensure long-term operational value, minimizing downtime and replacement costs over the asset's lifecycle.

Frequently Asked Questions

What is the coil voltage for the Siemens 3RT6015-1AN21?

The Siemens 3RT6015-1AN21 features a 220VAC coil voltage. This specific voltage is crucial for energizing the contactor's electromagnet to initiate the switching operation. Proper supply of 220VAC to the coil terminals (A1 and A2) is essential for its intended function.

What is the rated current of the 3RT6015-1AN21?

This contactor is rated for 7 Amperes under AC-3 duty conditions. AC-3 is the standard for motor control, indicating its capability to handle starting currents and continuous operation of motors. Exceeding this rating can compromise performance and longevity.

How many normally open (NO) contacts does this contactor have?

The Siemens 3RT6015-1AN21 is equipped with three normally open (NO) power contacts. These contacts are in an open state when the coil is de-energized and close when the coil is energized, allowing current to flow to the load.

Can this contactor be used for DC applications?

No, the Siemens 3RT6015-1AN21 is designed for AC applications, specifically with a 220VAC coil and AC-3 rated power contacts. Using it with DC voltage, especially for the coil, will result in malfunction or damage.

What type of mounting does the 3RT6015-1AN21 support?

This contactor is designed for easy mounting onto a standard 35mm DIN rail. This mounting method is common in industrial control panels, allowing for quick and secure installation of various components.

What are the terminal types for wiring this contactor?

The Siemens 3RT6015-1AN21 utilizes screw terminals for its electrical connections. This provides a secure and reliable means of attaching wires for both the power circuit and the control coil.

What is the maximum operating temperature for this Siemens contactor?

The contactor is rated for operation within an ambient temperature range of -25 to +60 degrees Celsius. Operating outside this range can affect performance, lifespan, and reliability.

Does this model come with auxiliary contacts?

The standard Siemens 3RT6015-1AN21 model does not include auxiliary contacts. However, auxiliary contact blocks (typically 1 NO + 1 NC) can often be added to the front for additional signaling or control functions.

What is the IP protection rating of this contactor?

The 3RT6015-1AN21 has an IP20 protection rating. This means it offers protection against solid objects larger than 12.5mm but is not protected against water ingress. It should be installed in a suitable enclosure.

How does the 400V in the product name relate to its operation?

The "400V" in the product name typically refers to the standard voltage rating of the *control circuit* for which the contactor coil might be designed or operate within a system operating at that voltage level. However, this specific model, 3RT6015-1AN21, has a 220VAC coil, meaning it requires 220VAC to be energized, not 400VAC. The 400V designation is often a general product series identifier or system compatibility note.