Siemens SIRIUS 3R Motor Starter Combination

Description

This is a pre-assembled motor starter from the Siemens SIRIUS 3R series, combining a power contactor and a thermal overload relay. It provides a reliable solution for switching and protecting three-phase asynchronous motors. This unit is designed for direct-on-line starting and is suitable for a wide range of industrial applications.

Specifications

• Manufacturer: Siemens
• Series: SIRIUS 3R
• Contactor Model: 3RT1044-1AP00
• Overload Relay Model: 3RU1146-4JB0
• Rated Power (AC-3, 400V): 30 kW
• Rated Current (AC-3, 400V): 65 A
• Coil Voltage: 230V AC, 50/60 Hz
• Overload Current Range: 57-75 A
• Trip Class: CLASS 10
• Size: S3
• Mounting: Direct mount / DIN rail

Label Info

• Auxiliary Contact Block: 3RH1921-1DA11 (1 NO + 1 NC)
• Ui: 1000V

Application

Ideal for controlling motors in applications such as pumps, fans, compressors, conveyors, and machine tools where robust and reliable overload protection is required.

Country of Origin

Made in Germany.

CO2 Impact

By choosing this refurbished component, you are saving approximately 60 kg of CO2 emissions compared to a new purchase. This is equivalent to driving a car for about 300 kilometers.

Availability

This is an obsolete item but available from our stock. The modern equivalent series is the Siemens SIRIUS 3RT2 and 3RU2. Order now from PLC2Day for expert support and fast delivery.

FAQ

The adjustable setting range for the thermal overload relay is from 57 to 75 Amperes, allowing for precise protection of motors within this full-load current range.

While it is primarily designed for three-phase motors, it can be wired for single-phase applications. However, the overload protection characteristics are optimized for balanced three-phase loads, and performance may differ.

No, accessories are generally not cross-compatible between these generations due to changes in physical design and connection points. It is recommended to use accessories specifically designed for the 3RT1/3RU11 series.

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Last Update: Friday, March 13, 2026