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2-year Warranty

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Siemens 3RT1034-1AC20

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2 Year warranty

Part Number3RT1034-1AC20
Model #3RT10341AC20
Warranty2 Year
CategorySize S2
DescriptionPower contactor
Insulation voltage rated value690 V
Protection IP20
Shock resistance @ AC10g / 5 ms, 5g / 10 ms at rectangular impulse
Shock resistance @ AC15g / 5 ms, 8g / 10 ms with sine pulse
Ambient temperature-25 ... +60 °C
Main current circuit3 Poles
Number of NO contacts3
Operating current50 A @ 40 °C rated value
Mountingscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022, side-by-side
Height 112 mm 112 mm
Width 55 mm55 mm
Depth 115 mm

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Repair Benefits

MRO can restore your failed 3RT1034-1AC20 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this 3RT1034-1AC20 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.

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If you are interested in getting credit for your faulty 3RT1034-1AC20, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 3RT1034-1AC20 Overview

Siemens 3RT1034-1AC20

The Siemens 3RT1034-1AC20 is a power contactor designed for AC-3 applications with a rated current of 32 A and a power rating of 15 kW at 400 V. This 3-pole contactor is part of the SIRIUS product brand and belongs to the S2 size category. It operates on a 24 V AC control supply voltage at a frequency of 50/60 Hz.

General Technical Data:

Insulation Voltage: 

The contactor has a rated insulation voltage of 690 V.

Degree of Pollution: 

It is suitable for environments with a degree of pollution level 3.

Surge Voltage Resistance: 

The surge voltage resistance is rated at 6 kV.

Maximum Permissible Voltage for Safe Isolation: 

Between coil and main contacts, the maximum permissible voltage is 400 V.

Protection Class: 

The front has a protection class of IP20, while the terminal has a protection class of IP00.

Ambient Conditions:

Installation Altitude: 

It can be installed at a maximum altitude of 2,000 m above sea level.

Ambient Temperature: 

The operating temperature ranges from -25 to +60 °C, and during storage, it can withstand temperatures from -55 to +80 °C.

Main Circuit:

Number of Poles: The contactor has 3 poles for the main current circuit.

Operating Current:

At AC-1 (at 400 V, 40 °C), the rated value is 50 A.

At AC-3 (at 400 V), the rated value is 32 A.

At AC-4 (at 400 V), the rated value is 29 A.

Connectable Conductor Cross-Section:

At AC-1, the minimum permissible conductor cross-section is 10 mm² at 60 °C and 16 mm² at 40 °C.

Operating current for approximately 200,000 operating cycles at AC-4 is 15.6 A at 400 V.

Operating Power:

At AC-1, the rated power is 31 kW at 400 V.

At AC-3, the rated power is 15 kW at 400 V.

Operating power for approximately 200,000 operating cycles at AC-4 is 8.2 kW at 400 V.

Thermal Short-Time Current: Limited to 320 A for 10 seconds.

No-Load Switching Frequency: 5,000 cycles per hour.

Control Circuit/Control:

Type of Voltage: 

The control supply voltage is AC with a rated value of 24 V.

Operating Range Factor: 

The control supply voltage rated value of magnet coil at AC ranges from 0.8 to 1.1 at 50 Hz and 0.85 to 1.1 at 60 Hz.

Pick-Up and Holding Power: 

The apparent pick-up power of the magnet coil at AC is 127 V·A, and the apparent holding power is 11.3 V·A.

Closing and Opening Delay: 

The closing delay is between 11 and 30 ms, and the opening delay is between 7 and 20 ms.

Arcing Time: 10 to 15 ms.

Auxiliary Circuit:

It has no instantaneous contacts in the auxiliary circuit.

Operating current at AC-15 is 3 A at 400 V.

UL/CSA Ratings:

Contact rating of auxiliary contacts according to UL A600/Q600.

Short-circuit protection is required for both the main circuit and the auxiliary switch.


The contactor can be mounted using screw and snap-on mounting onto a 35 mm standard mounting rail (DIN EN 50022).

It supports side-by-side mounting.


Height - 112 mm, Width - 55 mm, Depth - 115 mm.

Required spacing for grounded parts is 6 mm at the side.


Type of electrical connection for the main current circuit is screw-type terminals.

Type of electrical connection for the auxiliary and control current circuit is also screw-type terminals.

It supports various connectable conductor cross-sections for both main and auxiliary contacts.

FAQ (Frequently Asked Questions) about Siemens 3RT1034-1AC20 Power-Contactor:

What is the purpose of the Siemens 3RT1034-1AC20 power contactor?

The 3RT1034-1AC20 is designed to control electrical loads in AC-3 applications, offering reliable switching for various industrial processes.

What is the control supply voltage for this power contactor?

The control supply voltage is 24 V AC, operating at a frequency of 50/60 Hz.

What is the insulation voltage rating of the contactor?

The contactor has a rated insulation voltage of 690 V, ensuring safe and efficient operation.

What are the environmental conditions it can operate in?

It can be installed at altitudes of up to 2,000 m above sea level and can withstand operating temperatures ranging from -25 to +60 °C.

How many poles does the contactor have, and what is its rated current for different applications?

The contactor has 3 poles for the main current circuit. It has a rated current of 50 A at AC-1 (400 V, 40 °C), 32 A at AC-3 (400 V), and 29 A at AC-4 (400 V).

What is the thermal short-time current for this power contactor?

The thermal short-time current is limited to 320 A for a duration of 10 seconds.

What is the operating power of the contactor for different scenarios?

The rated power varies for different operating conditions. For example, at AC-1, it is 31 kW at 400 V, and at AC-3, it is 15 kW at 400 V.

Can it be mounted side-by-side with other components?

Yes, the contactor supports side-by-side mounting, providing flexibility in installation.

What type of electrical connections does it use, and what conductor cross-sections are supported?

It uses screw-type terminals for both main and auxiliary circuits, supporting various conductor cross-sections based on application requirements.

Is short-circuit protection required for the main circuit and auxiliary switch?

Yes, short-circuit protection is required. For the main circuit, the required fuse is gL/gG: 125 A, and for the auxiliary switch, a fuse of gL/gG: 10 A is required.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry Contactors from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3RT1034-1AC20, take a look at more from our Contactors line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 3RT1034-1AC20 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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