3RH1921-1LA11

Siemens 3RH1921-1LA11 – auxiliary contact block

The Siemens 3RH1921-1LA11 is an auxiliary contact block designed for use with Siemens contactors and motor starters. It expands switching and signaling capabilities within industrial control systems by providing additional auxiliary contacts for monitoring, interlocking and control functions.

The compact design allows quick installation directly onto compatible Siemens contactors, making it ideal for automation and motor control applications.

Technical overview:
• Series: SIRIUS
• Product type: auxiliary contact block
• Model: 3RH1921-1LA11
• Mounting position: front-mounted
• Contact configuration: 1 NO + 1 NC
• Function: auxiliary switching and signaling
• Compatibility: Siemens SIRIUS contactors and motor starters
• Connection type: screw terminal connection
• Installation: snap-on mounting
• Standards: IEC industrial control standards
• Protection class: IP20

Key technical details:
• Provides one normally open and one normally closed contact
• Quick front mounting on compatible contactors
• Reliable switching performance
• Compact and robust industrial design
• Suitable for interlocking and signaling circuits
• Long electrical and mechanical service life
• Designed for continuous industrial operation

Typical applications:
• Motor control panels
• Industrial automation systems
• Contactor monitoring circuits
• Safety interlocking systems
• Machine control cabinets
• Manufacturing equipment

About the manufacturer:
Siemens is a global leader in industrial automation, motor control and electrical engineering technologies.