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Siemens 3RH1921-2FA31 SIRIUS Auxiliary Switch Block - 3 NO + 1 NC

Siemens SIRIUS auxiliary switch block with 3 NO + 1 NC contacts.

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ManufacturerSiemens

Part number3RH1921-2FA31

Contact Configuration 3 NO + 1 NC

Mounting Type Front Mount, Snap-on

Terminal Type Spring-type

Standard EN 50005

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3 NO + 1 NC contacts Spring-type terminals Front mounting SIRIUS system EN 50005

Product description

The Siemens 3RH1921-2FA31 is an auxiliary switch block within the SIRIUS series, designed for integration with Siemens contactor relays and motor contactors. This unit provides a 3 Normally Open (NO) and 1 Normally Closed (NC) contact configuration, utilizing spring-type terminals for secure and reliable connections. It is designed for front mounting and is compatible with contactor sizes S0 through S12.

This auxiliary switch block is essential for expanding the control logic and signaling capabilities in industrial automation applications. It is widely used in motor control systems, control panels, and safety circuits to provide additional feedback or interlock functions. The EN 50005 standard compliance ensures its suitability for a broad range of applications.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RH1921-2FA31. We provide high-quality industrial automation components, ensuring your operations run smoothly. Choose Stanlo Automation for dependable and cost-effective solutions for your spare part needs.

Technical specifications

Contact Configuration	3 NO + 1 NC
Mounting Type	Front Mount, Snap-on
Terminal Type	Spring-type
Standard	EN 50005
Contactor Sizes	S0 - S12

Common applications

Motor Control Centers

Control Panels

Automation Circuits

Signaling

Interlocking Systems

Compatible systems

Compatible with Siemens SIRIUS 3RT contactors and 3RH contactor relays (sizes S0-S12)

Also known as

3RH19212FA31, Siemens 3RH1921-2FA31, SIRIUS 3RH1921-2FA31

Replaces / compatible with

This is a phased-out product. The successor is the SIRIUS 3RH2 series. Please verify compatibility with your specific application.

Technical note

Expert tip

The spring-type terminals on this auxiliary switch block provide a vibration-resistant connection, crucial for reliable operation in demanding industrial environments.

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Frequently asked questions

What is the contact configuration of the Siemens 3RH1921-2FA31 auxiliary switch block?

The Siemens 3RH1921-2FA31 auxiliary switch block is configured with 3 Normally Open (NO) contacts and 1 Normally Closed (NC) contact. These are instantaneous contacts.