Siemens SIRIUS Power Contactor 9A, 4kW, 400V, 3-Pole, 24V DC, Size S0 – 3RT2023-1BB408K

Product Description

The Siemens 3RT2023-1BB408K is a SIRIUS 3RT power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It has an AC-3e/AC-3 rated current of 9A and is suitable for motors up to 4kW at 400V. The contactor features a 24V DC control voltage, 3 main poles, 1 NO + 1 NC auxiliary contacts, screw terminal connections, and a compact S0 size. Siemens documentation confirms these specifications for the 3RT2023-1BB40 configuration.

The 3RT2023-1BB408K is suitable for DOL motor starters, pump systems, compressors, conveyors, HVAC equipment, industrial machinery, OEM control panels, and industrial automation applications requiring a 24V DC control supply.

Key Features

• Brand: Siemens

• Product Family: SIRIUS 3RT

• Model: 3RT2023-1BB408K

• Utilization Category: AC-3e/AC-3

• Rated Operational Current: 9A

• Motor Rating: 4kW at 400V

• Main Circuit: 3-pole

• Control Voltage: 24V DC

• Auxiliary Contacts: 1 NO + 1 NC

• Terminal Type: Screw terminal

• Contactor Size: S0

• Mounting: Screw fixing / snap-on mounting on TH35 DIN rail

• Application: Three-phase motor switching and industrial control

Applications

• Three-phase motor control

• DOL motor starters

• Pump control systems

• 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 DC control supply

• 1 NO + 1 NC auxiliary contacts for control and signaling

• Secure screw-terminal connections

• Compact S0 construction

• Suitable for DOL starter assemblies

• Easy integration into industrial control panels

• Reliable Siemens SIRIUS technology

• Suitable for industrial motor-control applications

Frequently Asked Questions

Q1. What is Siemens 3RT2023-1BB408K used for?

The 3RT2023-1BB408K 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 operational current of 9A.

Q3. What motor power can it handle?

It is suitable for three-phase motors up to 4kW at 400V in AC-3/AC-3e applications.

Q4. What is the control voltage?

The contactor operates with a 24V DC control voltage.

Q5. How many auxiliary contacts are provided?

It provides 1 NO + 1 NC auxiliary contacts for control, feedback, signaling, and electrical interlocking.

Q6. What type of terminals does it use?

The contactor uses screw terminal connections.

Q7. What is the contactor size?

The 3RT2023-1BB408K is a Size S0 contactor.

Q8. 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 an appropriately selected motor-protection device.

Q9. Is 3RT2023-1BB408K suitable for 7.5kW motors?

No. The 3RT2023-1BB40 family is rated 9A and 4kW at 400V. For a 7.5kW motor, a higher-rated SIRIUS contactor such as the 3RT2025 family should be considered. Siemens' catalog lists the 3RT2025-1BB40 at 17A and 7.5kW / 400V.

Q10. What are the main specifications?

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