Siemens 3RT1035-1AN20

Brand: Siemens
Model: 3RT1035-1AN20

Inventory situation: Goods are available in stock.

Product features

The Siemens 3RT1035-1AN20 boasts remarkable electrical capabilities, making it ideal for controlling motors of various sizes. Under AC-3 circumstances, it can handle an 18.5 kW motor at 400V, 15 horsepower at 230V, and 30 horsepower at 460V, with a rated current of 40A. The rated current for non-inductive or mildly inductive loads under AC-1 conditions is up to 60A, providing customers with flexibility for a variety of load types. The contactor employs a 220V AC coil that operates at both 50Hz and 60Hz frequencies, with an inrush power of 170VA and a holding power of 15VA to conserve energy during extended operation.

Installation and modification are simple with the Siemens 3RT1035-1AN20. It supports two handy mounting methods: snap it onto a regular 35mm DIN rail or screw it straight to a control cabinet panel. The contactor does not come with any built-in auxiliary contacts, but you can easily add 3RH1921 auxiliary contact modules-choose 1-pole, 2-pole, or 4-pole variants to acquire up to 4 auxiliary connections. This allows you to expand control features such as signal feedback and circuit interlocking. To protect motors from overload, use this contactor with 3RU1136 thermal overload relays or 3RB2036 solid-state overload relays. To make the system safer and more stable, consider using surge suppressors, varistors, or mechanical interlocks.

The Siemens 3RT1035-1AN20 is very strong in terms of safety and compliance. It conforms to the IEC 60946 standard and has contact protection to reduce the risk of electric shock during operation and maintenance. Although this type has been retired, it is still commonly utilized in existing motor control systems, conveyor lines, and pump control configurations. For users that require replacements, Siemens recommends the 3RT2028-1AN20 as a straight substitution that maintains performance and compatibility.

Specifications

Model	3RT1035-1AN20
Product Series	Siemens SIRIUS Series
Product Name	Three-phase AC Contactor
Number of Poles	3-pole
Coil Voltage	220V AC
Rated Power	18.5kW
Rated Current	40A
Wiring Method	Screw-type terminals

Precautions

Follow these critical measures to guarantee the Siemens 3RT1035-1AN20 AC contactor operates safely and reliably and performs optimally in accordance with industrial safety requirements, protecting both the equipment and users. These rules apply if you're installing, repairing, or integrating the Siemens 3RT1035-1AN20 into motor control systems, conveyor installations, or pump circuits.

First and foremost, always check electrical compatibility before usage. The Siemens 3RT1035-1AN20 has a 220V AC coil (50/60 Hz); thus, never connect it to voltages other than this range-overvoltage can harm the coil or cause short circuits. Match the contactor's load capability to your application; it can take 40A in AC-3 (motor) and 60A in AC-1 (non-inductive) conditions. Exceeding these ratings will result in overheating, contact wear, and equipment failure.

For installation, make sure the Siemens 3RT1035-1AN20 is mounted on a clean, flat surface, such as a 35mm DIN rail or a permanent panel with screws. Allow enough room around the contactor (per Siemens' suggested clearance) for proper heat dissipation, as overcrowding can compromise efficiency and longevity. Use only compatible accessories: 3RH1921 auxiliary contact modules for function expansion, 3RU1136 thermal overload relays or 3RB2036 solid-state overload relays for motor protection, and certified surge suppressors to defend against voltage spikes. Never use non-Siemens parts since they may jeopardize safety and compatibility.

FAQ

Q: What is the Siemens 3RT1035-1AN20?

A: The Siemens 3RT1035-1AN20 is a three-pole (3P) electromechanical contactor from Siemens' SIRIUS 3RT family. It is a remotely controlled switch used to create or break electrical power circuits, most typically for regulating three-phase motors, heaters, and other high-power loads in industrial and building automation applications.

Q: What is the difference between a contactor and a relay?

A: Both are electrically operated switches. Relays are commonly used for lower-current control circuits and signals. A contactor, such as the 3RT1035-1AN20, is specifically intended to manage the high currents and power levels encountered in main load circuits (e.g., motor currents up to 22A), with a durable construction for repeated use and arc suppression.

Q: What is the coil voltage AC220V, and why is it important?

A: The control coil voltage (AC220V) is the voltage necessary to power the contactor's electromagnet. When this voltage is given to the coil terminals (usually A1 and A2), the contactor closes, allowing power to flow from the main contacts to the load. To ensure dependable operation, use a contactor whose coil voltage matches that of your control circuit.