Siemens SIRIUS 3RH29 Auxiliary Contact Block 2NO+2NC Screw Terminals Front Mounting (3RH2911-1FB22)

The Siemens SIRIUS 3RH2911-1FB22 auxiliary contact block is a high-quality switching device designed for use with SIRIUS 3RT2 contactors and 3RH2 control relays. It features 2 normally open (NO) and 2 normally closed (NC) contacts, providing flexible control and signaling options. The front mounting design and screw terminal connections ensure easy installation and reliable electrical connections. Rated for insulation voltage up to 690 V and impulse withstand voltage of 6 kV, this contact block is suitable for demanding industrial environments.

Advantages

Reliable switching with silver alloy contacts ensures long electrical endurance of 10 million switching cycles and mechanical endurance of 30 million switching cycles. The compact 4-pole design saves space in control cabinets. Screw terminals allow secure wiring with solid or stranded conductors from 0.5 to 2.5 mm². The front mounting simplifies assembly and maintenance.

Suitable for

• Industrial automation and control systems
• Motor control centers
• Switchgear and distribution boards
• Machine building and plant engineering

Key specifications

• Contact configuration: 2 Normally Open (NO) + 2 Normally Closed (NC)
• Mounting type: Front mounting
• Connection type: Screw terminals
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operating current (AC-15, 230 V): 6 A
• Rated operating current (DC-13, 24 V): 10 A
• Degree of protection (front): IP40
• Degree of protection (terminals): IP20
• Ambient operating temperature: -25 to +60 °C
• Wire cross-section (solid/stranded): 0.5 ... 2.5 mm²
• Tightening torque: 0.8 ... 1.2 Nm
• Electrical endurance: 10 million switching cycles
• Mechanical endurance: 30 million switching cycles
• Compatibility: For SIRIUS 3RT2 contactors and 3RH2 control relays
• Number of poles: 4-pole
• Contact material: Silver alloy

Recommendations

For optimal performance, use with Siemens SIRIUS 3RT2 contactors or 3RH2 control relays. Ensure proper tightening torque and wire stripping length as per manufacturer guidelines. This auxiliary contact block is a reliable choice for extending the functionality of your control system.