Siemens 3RT7035-1AN20 High Capacity AC Control Contactor 200VAC 40A 3NO
The Siemens 3RT7035-1AN20 is a high-capacity AC control contactor designed for robust industrial applications. This 3-pole contactor features a 220 VAC coil and a rated current of 40A, making it suitable for demanding switching tasks. Its compact Size S2 design and screw terminals facilitate straightforward integration into control panels. The 3RT7035-1AN20 is engineered for reliability and longevity in environments where consistent performance is critical.
| Parameter | Specification |
| :------------------------ | :------------------------------------------- |
| Product Type | AC Control Contactor |
| Manufacturer | Siemens |
| Model Number | 3RT7035-1AN20 |
| Number of Poles | 3-pole |
| Coil Voltage | 220 VAC (50/60 Hz) |
| Rated Current (AC-3) | 40 A |
| Rated Operational Power | 18.5 kW @ 400V (AC-3) |
| Size | S2 |
| Auxiliary Contacts | 1 NO + 1 NC (front-mounted) |
| Terminal Type | Screw terminals |
| Mounting | DIN rail or screw mounting |
| Compliance | RoHS directive (substance restrictions) |
| Origin | China |
| Condition | New and Original |
Core Features & Market Positioning
The Siemens 3RT7035-1AN20 stands out in the industrial control market due to its high-capacity rating within a compact S2 frame size. This balance of power and physical footprint offers significant advantages in control panel design and space optimization. Siemens' SIRIUS line is renowned for its robust construction and adherence to international standards, positioning the 3RT7035-1AN20 as a reliable choice for critical motor control and power switching applications. Its compatibility with auxiliary components, such as overload relays and additional contact blocks, enhances its versatility and market appeal for complex automation systems.
Key Application Scenarios
This Siemens contactor is ideally suited for a wide array of industrial applications, primarily focused on controlling motors, lighting circuits, and general power distribution. Its 40A rating at AC-3 utilization category makes it perfect for direct on-line motor starting and control in manufacturing plants, processing facilities, and building automation systems. Common uses include motor control centers, HVAC systems, pump control, and conveyor systems where reliable, high-power switching is essential. The 220 VAC coil voltage aligns with standard industrial power supplies, simplifying integration into existing electrical infrastructure.
Practical System Integration Guidance
Integrating the Siemens 3RT7035-1AN20 into an electrical system is a straightforward process due to its user-friendly design. The contactor mounts easily onto a standard 35mm DIN rail or can be fixed with screws, allowing for flexible installation within control cabinets. It features screw terminals for secure and reliable connections of main power and control circuits. For motor control applications, it is often paired with Siemens overload relays (e.g., 3RU2136 or 3RB3036) that can be directly mounted to the bottom of the contactor for integrated motor protection. Up to eight additional auxiliary contacts can be added to the unit for expanded signaling and control logic, providing significant flexibility for complex automation tasks.
Operation and Risk Mitigation
Safe operation of the Siemens 3RT7035-1AN20 relies on adherence to standard electrical safety practices and the unit's built-in protective features. The contactor is designed to be touch-safe according to DIN VDE 0106 Part 100, minimizing the risk of accidental contact with live components during maintenance or operation. For comprehensive risk mitigation, it is crucial to ensure proper wiring, correct coil voltage application, and appropriate overload protection is in place. In the event of operational anomalies, such as overheating or failure to switch, immediate inspection of the power source, control signal, and mechanical linkages is recommended. While specific error codes are not typically associated with contactors of this type, visual inspection for signs of arcing, contact welding, or mechanical damage is paramount.
Scalability & Long-Term Value
The Siemens 3RT7035-1AN20 offers considerable long-term value through its compatibility with the broader Siemens SIRIUS system. This modularity allows for seamless expansion and adaptation of control systems. Additional auxiliary contact blocks can be added to increase signaling capabilities, and compatible overload relays ensure robust motor protection that can be adjusted for various load conditions. While direct integration into IIoT platforms might require additional gateway devices or controllers, the inherent reliability and standardization of Siemens components provide a solid foundation for future upgrades and integration into smart manufacturing environments. The availability of spare parts and the robust design ensure a long operational lifespan, contributing to the overall value proposition.
Frequently Asked Questions (FAQs)
What is the primary application for the Siemens 3RT7035-1AN20?
This contactor excels in motor control. It's designed for direct on-line starting and switching.
It's also suitable for general power distribution tasks. Applications include HVAC and pump control.
Its 40A rating (AC-3) ensures reliable operation in industrial settings.
Can I use the Siemens 3RT7035-1AN20 with different coil voltages?
No, this specific model is designed for a 220 VAC coil voltage.
Using a different voltage can damage the coil and the contactor. Always verify your system's voltage.
Consult the product manual for voltage variations if available.
What type of overload protection is recommended for the 3RT7035-1AN20?
Siemens recommends direct-mounting overload relays like the 3RU2136.
Other compatible Siemens overload relays can also be used. Proper sizing is critical.
Ensure the overload relay's trip class matches the motor's requirements.
How many auxiliary contacts can be added to this contactor?
Up to eight additional auxiliary contacts can be fitted.
These provide expanded signaling and control functions. Ensure proper mounting.
Refer to the manual for correct installation procedures.
What is the mounting method for the Siemens 3RT7035-1AN20?
It can be mounted on a standard 35mm DIN rail.
Alternatively, it supports direct screw mounting. Choose based on your panel layout.
Ensure secure mounting for reliable operation.
Does this contactor come with auxiliary contacts pre-installed?
Yes, the 3RT7035-1AN20 typically includes one NO and one NC front-mounted auxiliary contact.
These are useful for basic control feedback and interlocking. Check the specific product listing.
These are integrated into the basic unit for size S2.
What is the operational power rating of the 3RT7035-1AN20?
It can handle 18.5 kW at 400V under AC-3 utilization category.
This rating is crucial for motor sizing. Always match it to your load.
This ensures efficient and safe operation.
Is the Siemens 3RT7035-1AN20 suitable for DC applications?
No, this is an AC control contactor. It's optimized for AC circuits.
Using it in DC circuits can lead to arc issues. It is rated for AC-3 and AC-1.
For DC applications, specific DC contactors are required.
What does the "S2" in the product description signify?
"S2" refers to the size of the contactor. This is a standard Siemens sizing convention.
Size S2 indicates its physical dimensions and capacity. It's a mid-range size.
This size is suitable for 40A applications and specific power ratings.
Where is the Siemens 3RT7035-1AN20 manufactured?
According to available data, this specific model is manufactured in China.
Siemens maintains global manufacturing standards. Quality is consistent.
Origin can sometimes affect lead times or regional availability.
