Siemens SIRIUS 3RT20 Power Contactor, 3-Pole, AC-3, 4 kW, 230 V AC, 1 NO Auxiliary Contact, Screw Terminals

The Siemens SIRIUS 3RT20 power contactor is a reliable and compact switching device designed for motor control and other industrial applications. With a rated operational power of 4 kW at 400 V in AC-3 utilization category, it is suitable for switching three-phase motors. The contactor features a control supply voltage of 230 V AC at 50/60 Hz and includes one normally open auxiliary contact for additional control or signaling. Its screw-type terminals ensure secure and easy wiring, while the IP20 degree of protection makes it suitable for installation in control cabinets.

Advantages

High switching reliability and long electrical endurance of 10 million switching cycles under AC-3 conditions. The mechanical endurance of 30 million cycles ensures a long service life. Compact size S00 saves space in control panels. Easy installation on DIN rail or with screws.

Suitable for

• Motor starting and switching in industrial machinery
• Control of pumps, fans, conveyors, and compressors
• Automation systems and switchgear
• Applications requiring reliable switching under AC-3 load

Key specifications

• Product Type: Power Contactor
• Series: SIRIUS 3RT20
• Utilization Category: AC-3
• Number of Poles: 3
• Rated Operational Current (AC-3, 400 V): 9 A
• Rated Operational Power (AC-3, 400 V): 4 kW
• Control Supply Voltage: 230 V AC
• Control Supply Frequency: 50/60 Hz
• Number of NO Auxiliary Contacts: 1
• Number of NC Auxiliary Contacts: 0
• Contactor Size: S00
• Mounting Type: DIN Rail / Screw Mounting
• Degree of Protection: IP20
• Main Circuit Connection: Screw-type terminals
• Auxiliary/Control Circuit Connection: Screw-type terminals
• Electrical Endurance (AC-3): 10,000,000 switching cycles
• Mechanical Endurance: 30,000,000 switching cycles
• Ambient Operating Temperature: -25 to +60 °C

Recommendations

For optimal performance, ensure the control voltage matches your system. Use appropriate overload relays for motor protection. This contactor is part of the Siemens SIRIUS modular system, allowing easy integration with other components.