Siemens Auxiliary switch on front side, screw, 2NO + 2NC Part number 3RH2911-1GA22

Product Overview

The Siemens 3RH2911-1GA22 is a SIRIUS auxiliary contact block designed to extend the auxiliary contact functionality of Siemens contactors and control devices. It provides a total of four instantaneous contacts, comprising two normally open (2 NO) and two normally closed (2 NC) contacts. The unit is front-mounted and enables reliable signalling, interlocking, and control feedback in industrial motor control and automation systems.

Key Features

• SIRIUS auxiliary contact block for contactors and control devices
• Contact configuration: 2 NO + 2 NC (instantaneous)
• Front-mounted snap-on design for quick installation
• Screw terminals for secure and vibration-resistant wiring
• Compact design for space-efficient panel layouts
• High mechanical and electrical endurance for industrial use

Technical Specifications

• Article Number: 3RH2911-1GA22
• Product Family: SIRIUS 3RH Auxiliary Contact Blocks
• Accessory Type: Auxiliary contact block
• Contact Configuration: 2 NO + 2 NC
• Contact Type: Instantaneous
• Connection Type: Screw terminals
• Rated Insulation Voltage: 690 V
• Surge Withstand Voltage: 6 kV
• Rated Operational Current: Suitable for control circuit applications (AC-15)
• Mechanical Endurance: Approx. 10,000,000 switching cycles
• Electrical Endurance: Approx. 200,000 switching cycles (AC-15)
• Operating Temperature Range: −25 °C to +60 °C
• Mounting: Front mounting on compatible devices

Compliance & Standards

• Designed in accordance with IEC 60947-5-1 for auxiliary control devices
• Fully compatible with Siemens SIRIUS control and switching systems
• Suitable for industrial automation and motor control applications

Applications

The Siemens 3RH2911-1GA22 auxiliary contact block is used to add signalling, monitoring, and interlocking contacts to contactors in motor starters, control panels, and automation systems. Typical uses include status indication, feedback to PLCs, safety interlocks, and control logic expansion in industrial electrical installations.