Siemens SIRIUS Power Contactor 17A, 7.5kW, 400V, 3-Pole, 24V AC, Size S0 – 3RT2025-1AC20

Product Description

The Siemens 3RT2025-1AC20 is a SIRIUS 3RT2 Power Contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It is rated 17A in AC-3e/AC-3 applications and is suitable for motors up to 7.5 kW at 400V. The contactor has a 24V AC control voltage at 50/60 Hz, 3 main poles, 1 NO + 1 NC auxiliary contacts, screw terminals, and a compact S0 size. Siemens lists the product as an active SIRIUS contactor.

The 3RT2025-1AC20 is suitable for DOL motor starters, MCC panels, pumps, compressors, conveyors, HVAC equipment, industrial machinery, OEM control panels, and factory automation systems where a 24V AC control supply is required.

Key Features

• Brand: Siemens

• Product family: SIRIUS 3RT

• Model: 3RT2025-1AC20

• Utilization category: AC-3e/AC-3

• Rated operational current: 17A

• Motor rating: 7.5 kW at 400V

• Main circuit: 3-pole

• Control voltage: 24V AC

• Control frequency: 50/60 Hz

• Auxiliary contacts: 1 NO + 1 NC

• Terminal type: Screw terminal

• Contactor size: S0

• Rated insulation voltage: 690V

• Surge withstand voltage: 6kV

• Front protection: IP20

• Mechanical service life: typically 10 million operating cycles

• Net weight: approximately 407g

Applications

• Three-phase motor control

• DOL motor starters

• Motor Control Centers (MCC)

• Industrial automation panels

• Pump control systems

• Compressor systems

• Conveyor systems

• HVAC equipment

• Manufacturing machinery

• OEM electrical panels

• Machine automation

• Factory electrical systems

Benefits

• Reliable 17A AC-3e/AC-3 motor switching

• Suitable for motors up to 7.5kW at 400V

• 24V AC, 50/60Hz control supply

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

• Secure screw-terminal connections

• Compact S0 construction

• High 690V insulation voltage

• 6kV surge withstand capability

• Long mechanical service life

• Easy integration into industrial motor-control systems

• Suitable for DOL starter applications

• Reliable Siemens SIRIUS technology

Frequently Asked Questions

Q1. What is Siemens 3RT2025-1AC20 used for?

The 3RT2025-1AC20 is a Siemens SIRIUS power contactor used for switching and controlling three-phase motors and industrial electrical loads.

Q2. What is the rated current?

The contactor is rated 17A for AC-3e/AC-3 applications.

Q3. What motor power can it handle?

It is suitable for motors up to 7.5kW at 400V.

Q4. What is the control voltage?

The contactor operates with a 24V AC control voltage at 50/60Hz. The specified AC control-voltage operating range is 0.8–1.1 × rated voltage at 50Hz and 0.85–1.1 × rated voltage at 60Hz.

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 3RT2025-1AC20 uses screw terminal connections.

Q7. What is the contactor size?

The contactor is Size S0.

Q8. What is its insulation voltage?

The rated insulation voltage is 690V, with a 6kV surge withstand capability.

Q9. Can it be used in a DOL starter?

Yes. The contactor can be used in a DOL motor starter together with a suitably selected motor-protection device.

Q10. Is Siemens 3RT2025-1AC20 an active product?

Yes. Siemens lists 3RT2025-1AC20 as PM300: Active Product.