SIEMENS SIRIUS 3RT2 Power Contactor 5.5 kW 400 V 12 A 24 V DC 2NO+2NC Screw Terminals 3RT20171BB443MA0

The SIEMENS SIRIUS 3RT2 power contactor in size S0 combines a 5.5 kW AC-3 rating at 400 V with a 24 V DC coil and a 2NO+2NC auxiliary contact arrangement. Its screw terminal connections suit DIN rail or screw mounting, making it a practical choice for motor control and switching tasks.

Highlights

• Rated operational current of 12 A (AC-3, 400 V)
• Control supply voltage: 24 V DC
• Auxiliary contacts: 2 NO + 2 NC
• Three-pole main circuit with screw terminals
• Mechanical endurance of 30 million switching cycles

In daily use

This contactor is built for reliable switching in industrial control panels. The 24 V DC coil allows direct integration with PLC outputs, while the auxiliary contacts provide feedback or interlocking signals. Screw terminals ensure secure wiring, and the S0 size fits standard 35 mm DIN rails.

Full specifications

• Series: SIRIUS 3RT2
• Size: S0
• Rated operational current (AC-3, 400 V): 12 A
• Rated power (AC-3, 400 V): 5.5 kW
• Control supply voltage: 24 V DC
• Auxiliary contacts: 2 NO + 2 NC
• Number of poles: 3
• Main circuit connection: screw terminals
• Auxiliary circuit connection: screw terminals
• Mounting: DIN rail / screw mounting
• Degree of protection: IP20
• Operating temperature: -25 to +60 °C
• Electrical endurance (AC-3): 10 million switching cycles
• Mechanical endurance: 30 million switching cycles
• Rated insulation voltage: 690 V
• Surge voltage resistance: 6 kV

Final note

A compact and dependable contactor for standard motor loads, with a coil voltage suited to common control systems.