SIEMENS SIRIUS Auxiliary Contact Block 3RH2911-1FB11, 1NO+1NC, Screw Terminals, Front Mount for 3RT2/3RH2

With a rated insulation voltage of 690 V and an impulse withstand of 6 kV, this auxiliary contact block delivers robust switching for demanding control circuits.

Overview

The SIEMENS 3RH2911-1FB11 is a front-mounting auxiliary contact block from the SIRIUS series. It provides one normally open (NO) and one normally closed (NC) contact, expanding the signaling capabilities of 3RT2 contactors and 3RH2 contactor relays. Screw terminals ensure secure wiring, and the block supports solid or fine-stranded conductors from 0.5 to 2.5 mm².

What stands out

• High electrical endurance: 10 million switching cycles at AC-15
• Wide operating temperature range: -25 to +60 °C
• Compact front mounting for easy installation
• Rated for both AC and DC control circuits

Technical details

• Contact configuration: 1 NO + 1 NC
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• AC-15 operating current: 6 A at 230 V, 3 A at 400 V
• DC-13 operating current: 10 A at 24 V, 0.3 A at 220 V
• Mechanical life: 30 million switching cycles
• Degree of protection: IP40 front, IP20 terminals
• Terminal type: screw
• Wire cross-section: 0.5 - 2.5 mm² (solid or fine-strand with ferrule)

Our verdict

A reliable auxiliary contact block for industrial control applications, offering high switching performance and easy integration with SIRIUS contactors.