Siemens SIRIUS Auxiliary Contact Block 3NO+1NC Front Mount 3RH2911-2XA31-0MA0

With a mechanical endurance of 30 million switching cycles, this Siemens SIRIUS auxiliary contact block delivers exceptional longevity in demanding industrial control circuits. The 3RH2911-2XA31-0MA0 provides 3 normally open and 1 normally closed contacts, front-mounted directly onto compatible SIRIUS 3RT2 contactors.

Overview

This 4-pole auxiliary contact block expands the signaling and interlocking capabilities of your contactor setup. Screw terminals accept solid or fine-stranded conductors from 0.5 to 2.5 mm², ensuring secure connections. Rated insulation voltage is 690 V AC / 600 V DC, with an impulse withstand of 6 kV.

What stands out

• High mechanical endurance: 30 million cycles
• Electrical endurance: 10 million cycles
• Operational current: 6 A at AC-15 230 V, 1 A at DC-13 24 V
• Wide operating temperature range: -25 to +60 °C
• IP20 degree of protection

Technical details

• Contact configuration: 3 NO + 1 NC
• Mounting: front mounting
• Compatibility: SIRIUS 3RT2 contactors
• Terminal type: screw terminals
• Connection cross-section: 0.5 - 2.5 mm² (solid and fine-strand with core end sleeve)
• Rated insulation voltage (Ui): 690 V AC / 600 V DC
• Rated impulse withstand voltage (Uimp): 6 kV
• Standards: IEC 60947-5-1, UL, CSA

Our verdict

A robust and reliable auxiliary contact block for SIRIUS contactors, built for high-cycle applications where dependable switching is critical.