SIEMENS Auxiliary Contact Block 40E SB10E S00 3RH2911-2G (3RH29112GA04)

In industrial control panels, electricians often need to expand the signaling capabilities of contactors and control relays. The SIEMENS 3RH2911-2G auxiliary contact block mounts directly onto the front of SIRIUS 3RT2 contactors and 3RH2 control relays, adding four auxiliary contacts (2 NO + 2 NC) for reliable status feedback and interlocking. Its screw terminals accept solid conductors from 0.5 to 2.5 mm² and stranded conductors with ferrules from 0.5 to 1.5 mm², ensuring secure connections in demanding environments.

Key specifications

• Contact configuration: 2 NO + 2 NC
• Mounting: front mounting on S00 size contactors/relays
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Operating current AC-15 at 230 V: 6 A
• Operating current AC-15 at 400 V: 3 A
• Operating current DC-13 at 24 V: 10 A
• Operating current DC-13 at 125 V: 1 A
• Degree of protection: IP40 front, IP20 terminals
• Ambient operating temperature: -25 to +60 °C
• Mechanical endurance: 30 million switching cycles
• Electrical endurance: 10 million switching cycles
• Terminal type: screw terminals
• Connection cross-section solid: 0.5 - 2.5 mm²
• Connection cross-section stranded with ferrule: 0.5 - 1.5 mm²

Why choose it

This auxiliary contact block is engineered for high switching reliability and long service life, making it suitable for continuous operation in industrial automation. Its compact S00 size integrates seamlessly with existing SIEMENS control gear, reducing panel space and wiring effort.

Ideal use cases

• Status monitoring of motor contactors in conveyor systems
• Interlocking circuits in machine safety applications
• Expanding control relay contacts in PLC output circuits
• Signaling in HVAC and pump control panels

Good to know

The block is designed for front mounting without tools, ensuring quick installation and replacement. It is compatible with all SIRIUS 3RT2 contactors and 3RH2 control relays in size S00.