Siemens SIRIUS Auxiliary Switch Block 1 NO Front Mount for 3RT2 Contactors and 3RH2 Relays, Screw Terminals, 690V Insulation, 3RH2911-1AA10

Control circuits often need an extra normally open contact to signal the state of a contactor or relay, but adding a separate relay consumes panel space and wiring time. This Siemens SIRIUS auxiliary switch block solves that by snapping directly onto the front of compatible 3RT2 contactors and 3RH2 control relays, providing one additional NO contact without extra mounting or wiring complexity.

Who is it for

Panel builders, machine OEMs, and maintenance technicians who use Siemens SIRIUS contactors and relays in industrial control systems and need a reliable, space-saving way to expand contact availability.

Main features

• 1 NO (normally open) contact for control and signaling circuits
• Front mounting on Siemens 3RT2 contactors and 3RH2 control relays, sizes S00 to S3
• Screw terminals accept solid wires 0.5–4 mm² and fine-stranded wires with end sleeves 0.5–2.5 mm²
• Rated insulation voltage 690 V and impulse withstand voltage 6 kV for robust industrial use
• High electrical durability: 10 million switching cycles; mechanical durability: 30 million cycles
• Operating temperature range -25 to +60 °C; storage -55 to +80 °C

Specifications

• Contact configuration: 1 NO
• Mounting: front
• Compatibility: Siemens SIRIUS 3RT2 contactors, 3RH2 control relays (sizes S00–S3)
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operational current AC-15 at 230 V: 6 A
• Rated operational current DC-13 at 24 V: 10 A
• Terminal type: screw
• Wire cross-section solid: 0.5–4 mm²
• Wire cross-section fine-strand with end sleeve: 0.5–2.5 mm²
• Operating temperature: -25 to +60 °C
• Storage temperature: -55 to +80 °C
• Degree of protection front: IP40
• Degree of protection terminals: IP20
• Electrical durability: 10 million switching cycles
• Mechanical durability: 30 million switching cycles
• Standards: IEC 60947-5-1, EN 60947-5-1

Tips

Ensure the contactor or relay is de-energized before mounting the auxiliary switch block. For frequent switching applications, consider the electrical durability rating to plan maintenance intervals.