Siemens SIRIUS Power Contactor 9A, 4kW, 400V, 3-Pole, 24V AC – 3RT2023-1AC208K

Product Description

The Siemens 3RT2023-1AC208K is a SIRIUS 3RT2 power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It belongs to the 3RT2023 series and provides an AC-3e/AC-3 rated current of 9A, suitable for motors up to 4kW at 400V. The contactor has a 24V AC control voltage at 50/60Hz, three main poles, 1 NO + 1 NC auxiliary contacts, screw-terminal connections, and compact Size S0 construction.

It is suitable for DOL motor starters, pump systems, compressors, conveyors, HVAC equipment, industrial machinery, OEM control panels, and automation applications.

Key Features

• Brand: Siemens

• Product Family: SIRIUS 3RT

• Model: 3RT2023-1AC208K

• Utilization Category: AC-3e/AC-3

• Rated Operational Current: 9A

• Motor Rating: 4kW at 400V

• Main Circuit: 3-pole

• Control Voltage: 24V AC

• Control Frequency: 50/60Hz

• Auxiliary Contacts: 1 NO + 1 NC

• Terminal Type: Screw terminal

• Contactor Size: S0

• Rated Insulation Voltage: 690V

• Surge Withstand Voltage: 6kV

• Mechanical Service Life: Up to 10 million operating cycles

Applications

• Three-phase motor control

• DOL motor starters

• Pump control panels

• Compressor systems

• Conveyor systems

• HVAC equipment

• Industrial automation panels

• Manufacturing machinery

• OEM control panels

• Factory automation

Benefits

• Reliable 9A AC-3e/AC-3 motor switching

• Suitable for motors up to 4kW at 400V

• 24V AC, 50/60Hz control supply

• 1 NO + 1 NC auxiliary contacts

• Secure screw-terminal connections

• Compact S0 design

• 690V rated insulation voltage

• 6kV surge withstand capability

• Long mechanical service life

• Easy integration into industrial control panels

• Reliable Siemens SIRIUS technology

Frequently Asked Questions

Q1. What is Siemens 3RT2023-1AC208K used for?

It is used for switching and controlling three-phase motors and industrial electrical loads in motor-control and automation systems.

Q2. What is the rated current?

The contactor has an AC-3e/AC-3 rated current of 9A.

Q3. What motor power can it handle?

It is suitable for motors up to 4kW at 400V.

Q4. What is the control voltage?

The contactor operates with a 24V AC control voltage at 50/60Hz.

Q5. How many auxiliary contacts are provided?

It provides 1 NO + 1 NC auxiliary contacts.

Q6. What type of terminals does it use?

The contactor uses screw terminal connections.

Q7. What is the contactor size?

The contactor is Size S0.

Q8. Is it suitable for a 7.5kW motor?

No. The 3RT2023-1AC20 is rated 9A / 4kW at 400V. For a 7.5kW motor, Siemens lists the 3RT2025 family, rated 17A / 7.5kW at 400V.

Q9. Can it be used in a DOL starter?

Yes. It can be used as the main contactor in a DOL motor starter when paired with a suitably rated motor-protection device.

Q10. What are the main specifications?

The main specifications are 9A AC-3e/AC-3, 4kW at 400V, 3-pole, 24V AC 50/60Hz control, 1 NO + 1 NC auxiliary contacts, screw terminals, and S0 size.