Siemens Auxiliary Contact Block 3RH2911-1HA20, 2 NO, Front Mounting, Screw Terminals

In industrial control systems, expanding the contact capacity of contactors and relays often requires additional auxiliary contacts for signaling, interlocking, or control tasks. The Siemens 3RH2911-1HA20 auxiliary contact block provides two normally open (NO) contacts, enabling reliable integration into SIRIUS 3RT2 contactors and SIRIUS 3RH2 control relays.

Who is it for

This auxiliary contact block is intended for electrical engineers, panel builders, and maintenance technicians who need to add auxiliary contacts to Siemens SIRIUS switching devices. It suits applications in motor control centers, automation panels, and machine control circuits where space and reliability are critical.

Main features

• Two normally open (NO) contacts for control and signaling
• Front mounting for easy installation without tools
• Screw terminals ensure secure and vibration-resistant wiring
• Compatible with SIRIUS 3RT2 contactors and SIRIUS 3RH2 control relays
• Rated insulation voltage up to 690 V, suitable for industrial environments

Specifications

• Contact configuration: 2 NO
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operating current AC-15 at 230 V: 6 A
• Rated operating current AC-15 at 400 V: 3 A
• Rated operating current DC-13 at 24 V: 1 A
• Degree of protection: IP20
• Ambient operating temperature: -25 to +60 °C
• Electrical durability: 10 million switching cycles
• Mechanical durability: 30 million switching cycles
• Short-circuit protection fuse gG: 10 A
• Standards: IEC 60947-5-1, EN 60947-5-1

Tips

Mount the contact block on the front of the contactor or relay. Ensure the control circuit voltage and current do not exceed the rated values for the contact configuration. Use appropriate screwdrivers for terminal tightening as per installation guidelines.