Product Description

Siemens SIRIUS Power Contactor 9A, 4kW, 400V, 3-Pole, 24V DC, Size S0 – 3RT2023-1BB40

Product Description

The Siemens 3RT2023-1BB40 is a SIRIUS 3RT2 power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It is rated 9A for AC-3e/AC-3 applications 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. These specifications are confirmed by Siemens' official datasheet.

The 3RT2023-1BB40 is suitable for DOL motor starters, pump systems, compressors, conveyors, HVAC equipment, industrial machinery, OEM control panels, and factory automation applications requiring a 24V DC control circuit.

Key Features

• Brand: Siemens

• Product Family: SIRIUS 3RT

• Model: 3RT2023-1BB40

• 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

• 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 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

• 690V rated insulation voltage

• 6kV surge withstand capability

• Long mechanical service life

• Suitable for DOL starter assemblies

• Reliable Siemens SIRIUS technology

Frequently Asked Questions

Q1. What is Siemens 3RT2023-1BB40 used for?

The 3RT2023-1BB40 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 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 3RT2023-1BB40 is a Size S0 contactor.

Q8. Is it suitable for a 7.5kW motor?

No. The 3RT2023-1BB40 is rated 4kW at 400V. For a 7.5kW / 400V / 24V DC application, Siemens lists 3RT2025-1BB40, rated 17A and 7.5kW.

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 an appropriately 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 DC coil, 1 NO + 1 NC auxiliary contacts, screw terminals, and S0 size.