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Siemens 3RH1921-1XA31-0MA3 Auxiliary Switch Block - 3 NO, 1 NC

Siemens 3RH1921-1XA31-0MA3 Auxiliary Switch Block: 3 NO, 1 NC.

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ManufacturerSiemens

Part number3RH1921-1XA31-0MA3

Contact Configuration 3 NO, 1 NC

Terminal Type Screw Terminal

Mounting Front-side

Series SIRIUS 3RH19

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Veteran-owned

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3 NO and 1 NC contacts For Siemens S0-S12 motor contactors Complies with EN 50012 Screw terminal connections Expands contactor functionality

Product description

The Siemens 3RH1921-1XA31-0MA3 is an auxiliary switch block designed for expanding the functionality of Siemens motor contactors, from size S0 to S12. It features a configuration of 3 normally open (NO) and 1 normally closed (NC) contacts, complying with EN 50012 standards. This block utilizes screw terminals for reliable electrical connections.

This auxiliary switch block is essential for applications requiring additional signaling or control points, such as status feedback to PLCs, interlocking circuits, or control of auxiliary devices. It is widely used in industrial automation, motor control centers, and machine building.

Stanlo Automation, a veteran-owned business, offers the Siemens 3RH1921-1XA31-0MA3. We provide high-quality surplus automation parts with excellent service and support.

Technical specifications

Contact Configuration	3 NO, 1 NC
Terminal Type	Screw Terminal
Mounting	Front-side
Series	SIRIUS 3RH19
Compatibility	Siemens Motor Contactors S0-S12
Standard	EN 50012

Common applications

Motor Control

Control Panels

Industrial Automation

Machine Building

Switchgear

Factory Automation

Compatible systems

Siemens Motor Contactors (Sizes S0 to S12)

Also known as

Siemens SIRIUS 3RH1921-1XA31 3RH1921-1XA31 Siemens Contactor Auxiliary Block

Replaces / compatible with

This part is a successor to older SIRIUS 3RH2 series auxiliary switches. It is designed to expand the functionality of Siemens 3RT1 series motor contactors.

Technical note

Expert tip

This is a phased-out product. Ensure compatibility with existing systems as a successor (SIRIUS 3RH2) may be a more current option for new installations. Verify terminal tightness before energizing circuits.

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Frequently asked questions

What is the contact configuration of the Siemens 3RH1921-1XA31-0MA3?

The Siemens 3RH1921-1XA31-0MA3 features a 3 NO (normally open) and 1 NC (normally closed) contact configuration. This allows for expanded signaling and control capabilities when used with compatible Siemens motor contactors.