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Siemens 3RH1921-1HA22 Auxiliary Switch Block - 2 NO + 2 NC

Siemens 3RH1921-1HA22 4-pole auxiliary switch block with 2 NO + 2 NC contacts.

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ManufacturerSiemens

Part number3RH1921-1HA22

Contacts 2 NO + 2 NC

Poles 4

Terminal Type Screw

Standards EN 50012

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2 NO + 2 NC configuration Screw terminal connections Compatible with S0-S3 contactors EN 50012 compliant Phased-out product

Product description

The Siemens 3RH1921-1HA22 is a 4-pole auxiliary switch block for motor contactors ranging from size S0 to S3. It provides a balanced configuration of 2 normally open (NO) and 2 normally closed (NC) contacts, connected via screw terminals. This auxiliary block adheres to EN 50012 standards.

This switch block is essential for implementing complex control logic in motor starter circuits, providing feedback and interlocking capabilities. It finds application in various industrial settings requiring robust and reliable control components.

Stanlo Automation, a veteran-owned business, specializes in surplus industrial parts, including the Siemens 3RH1921-1HA22. Trust us for your automation needs, ensuring you get quality components for your projects.

Technical specifications

Contacts	2 NO + 2 NC
Poles	4
Terminal Type	Screw
Standards	EN 50012
Contactor Size Compatibility	S0-S3
Product Type	Auxiliary Switch Block

Common applications

Motor control

Control panels

Automation systems

Machine building

Safety circuits

Interlocking

Compatible systems

Siemens 3RT1 Motor Contactors (Sizes S0-S3)

Also known as

Siemens 3RH1921-1HA22 SIRIUS auxiliary switch Siemens 2NO2NC auxiliary

Replaces / compatible with

This is a phased-out product. The successor is the SIRIUS 3RH2 series.

Technical note

Expert tip

This auxiliary switch block is designed for front mounting and is compatible with Siemens 3RT1 motor contactors up to size S3.

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Frequently asked questions

What are the contact specifications for the Siemens 3RH1921-1HA22 auxiliary switch block?

The Siemens 3RH1921-1HA22 auxiliary switch block is a 4-pole unit featuring 2 normally open (NO) and 2 normally closed (NC) contacts, ideal for diverse control applications.