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Siemens 3RH1921-1HA31 Auxiliary Switch Block - 3 NO + 1 NC

Siemens 3RH1921-1HA31 4-pole auxiliary switch block with 3 NO + 1 NC contacts.

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ManufacturerSiemens

Part number3RH1921-1HA31

Contacts 3 NO + 1 NC

Poles 4

Terminal Type Screw

Standards EN 50012

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3 NO + 1 NC configuration Screw terminal connections Compatible with S0-S12 contactors EN 50012 compliant Phased-out product

Product description

The Siemens 3RH1921-1HA31 is a 4-pole auxiliary switch block designed for motor contactors in sizes S0 to S12. It features a 3 normally open (NO) and 1 normally closed (NC) contact configuration, utilizing screw terminals for secure connections. This block is compliant with EN 50012 standards.

This auxiliary switch is suitable for applications requiring more NO contacts than NC, such as signaling multiple conditions or controlling multiple circuits simultaneously. It's widely used in industrial automation, panel building, and machine safety systems.

Stanlo Automation, a veteran-owned surplus distributor, provides access to essential automation components like the Siemens 3RH1921-1HA31. Rely on us for your part needs to ensure operational continuity.

Technical specifications

Contacts	3 NO + 1 NC
Poles	4
Terminal Type	Screw
Standards	EN 50012
Contactor Size Compatibility	S0-S12
Product Type	Auxiliary Switch Block

Common applications

Motor control

Control panels

Automation systems

Machine building

Safety circuits

Signaling

Compatible systems

Siemens 3RT1 Motor Contactors (Sizes S0-S12)

Also known as

Siemens 3RH1921-1HA31 SIRIUS auxiliary switch Siemens 3NO1NC 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 on Siemens 3RT1 motor contactors in sizes S0 through S12.

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Frequently asked questions

What is the contact arrangement on the Siemens 3RH1921-1HA31 auxiliary switch block?

The Siemens 3RH1921-1HA31 auxiliary switch block features a 4-pole setup with 3 normally open (NO) and 1 normally closed (NC) contacts, offering a specific combination for control needs.