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Siemens 3RH1921-2FA22 SIRIUS Auxiliary Switch Block - 2 NO + 2 NC

Siemens SIRIUS auxiliary switch block with 2 NO + 2 NC contacts.

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ManufacturerSiemens

Part number3RH1921-2FA22

Contact Configuration 2 NO + 2 NC

Mounting Type Snap-on

Terminal Type Spring-type

Standard EN 50005

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2 NO + 2 NC contacts Spring-type terminals Snap-on mounting SIRIUS system compatibility EN 50005 compliant

Product description

The Siemens 3RH1921-2FA22 is an auxiliary switch block from the SIRIUS line, designed for use with contactor relays and motor contactors. It features a configuration of 2 Normally Open (NO) and 2 Normally Closed (NC) contacts, with spring-type terminals for secure connections. This block is designed for snap-on mounting onto contactors in sizes S0 through S12, adhering to the EN 50005 standard.

This auxiliary switch block is integral to expanding the control and signaling capabilities of industrial electrical systems. It finds applications in motor control centers, automation systems, and safety interlocks where additional control logic or feedback signals are required. Its compatibility with various Siemens contactors makes it a versatile component for diverse industrial environments.

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Technical specifications

Contact Configuration	2 NO + 2 NC
Mounting Type	Snap-on
Terminal Type	Spring-type
Standard	EN 50005
For Contactor Sizes	S0 - S12

Common applications

Motor Control

Automation Systems

Control Circuits

Signaling

Interlocking

Compatible systems

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

Also known as

3RH19212FA22, Siemens 3RH1921-2FA22, SIRIUS 3RH1921-2FA22

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

This auxiliary switch block utilizes spring-type terminals, offering a secure and reliable connection, especially beneficial in high-vibration environments.

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Frequently asked questions

What are the contact specifications for the Siemens 3RH1921-2FA22 auxiliary switch block?

The Siemens 3RH1921-2FA22 auxiliary switch block features a configuration of 2 Normally Open (NO) and 2 Normally Closed (NC) contacts. These are instantaneous contacts designed to provide reliable switching for control and signaling circuits.