Siemens 3RH1921-1HA22

The Siemens 3RH1921-1HA22 is an auxiliary switch block designed for use with Siemens motor contactors, specifically sizes S0 to S3. This component adds additional contact points to the contactor, facilitating auxiliary signaling and control functions in electrical circuits.

Key Features:

• Contact Configuration: Features 2 Normally Open (NO) and 2 Normally Closed (NC) contacts, providing versatile switching options for various applications.

• Mounting: Designed for snap-on front mounting, this auxiliary switch block attaches directly to the front of compatible Siemens contactors without the need for tools, simplifying installation and maintenance.

• Terminals: Equipped with screw terminals, ensuring secure and reliable electrical connections.

• Compliance: Conforms to international standards such as IEC 60947-5-1 and EN 50012, ensuring quality and compatibility in industrial environments.

• Product Lifecycle: Please note that the 3RH1921-1HA22 model has been phased out as of February 1, 2023. The recommended successor is the Siemens SIRIUS 3RH2 series, which offers enhanced features and continued support. 

Applications:

The 3RH1921-1HA22 auxiliary switch block is suitable for integration with Siemens 3RT1 contactors, enhancing their functionality by providing additional NO and NC contacts for auxiliary circuits. This is particularly beneficial in applications requiring status monitoring, interlocking, or control functions beyond the capabilities of the contactor's built-in contacts.