Siemens SIRIUS Power Contactor 9A, 4kW, 400V, 3-Pole, 48V AC, Size S0 – 3RT2023-1AH20

Product Description

The Siemens 3RT2023-1AH20 is a SIRIUS 3RT2 power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. The 3RT2023 series is rated 9A for AC-3e/AC-3 applications and is suitable for motors up to 4kW at 400V. The AH coil variant is designed for a 48V AC control supply, with 3 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: 3RT2023-1AH20

• Utilization Category: AC-3e/AC-3

• Rated Operational Current: 9A

• Motor Rating: 4kW at 400V

• Main Circuit: 3-pole

• Control Voltage: 48V AC

• Control Frequency: 50Hz

• Auxiliary Contacts: 1 NO + 1 NC

• Terminal Type: Screw terminal

• Contactor Size: S0

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

• Product Family: SIRIUS 3RT contactors, 3-pole

Applications

• Three-phase motor control

• DOL motor starters

• Motor Control Centers (MCC)

• 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

• 48V AC control supply

• 1 NO + 1 NC auxiliary contacts

• Secure screw-terminal connections

• Compact S0 construction

• Suitable for DOL starter applications

• Easy integration into industrial control panels

• Reliable Siemens SIRIUS technology

Frequently Asked Questions

Q1. What is Siemens 3RT2023-1AH20 used for?

The 3RT2023-1AH20 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 AH variant uses a 48V AC control supply.

Q5. How many auxiliary contacts are provided?

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

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 series is rated 9A / 4kW at 400V. For a 7.5kW application, Siemens' 3RT2025 series is the appropriate higher-rated family, with 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 selected motor-protection device.

Q10. What are the main specifications?

The main specifications are 9A AC-3e/AC-3, 4kW at 400V, 3-pole, 48V AC control, 1 NO + 1 NC auxiliary contacts, screw terminals, and S0 size.