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Siemens 3RH1921-1FE22: Solid-State Auxiliary Switch, 1 NO + 1 NC

Siemens 3RH1921-1FE22: Solid-state compatible auxiliary switch, 1 NO + 1 NC.

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ManufacturerSiemens

Part number3RH1921-1FE22

Type Auxiliary Switch

Compatibility Solid-state

Contacts 1 NO (encapsulated) + 1 NO (non-encapsulated) + 1 NC

Mounting Front

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Solid-state compatible 1 encapsulated NO contact 1 non-encapsulated NO contact 1 NC contact Front mounting

Product description

The Siemens 3RH1921-1FE22 is a front-mounted auxiliary switch block compatible with solid-state electronics. It features a unique configuration with one normally open (NO) contact that is encapsulated and another NO contact that is not encapsulated. Additionally, it includes one normally closed (NC) contact. This block is designed for use with Siemens contactors in sizes S0 through S12.

This type of auxiliary switch is suitable for demanding industrial applications where electronic compatibility is required, such as in modern control systems, PLCs, and sensitive signal processing. The dual NO contacts offer flexibility, while the encapsulated contact provides enhanced protection.

Stanlo Automation, a veteran-owned surplus parts distributor, provides access to specialized components like the Siemens 3RH1921-1FE22. We understand the need for reliable surplus and obsolete parts in the industrial automation sector. Partner with Stanlo Automation to secure the parts you need for your operational continuity.

Technical specifications

Type	Auxiliary Switch
Compatibility	Solid-state
Contacts	1 NO (encapsulated) + 1 NO (non-encapsulated) + 1 NC
Mounting	Front
Contactor Size Compatibility	S0 to S12
Series	SIRIUS 3RH19

Common applications

PLC interface

Electronic control systems

Motor control

Automation panels

Industrial machinery

Signaling circuits

Compatible systems

Siemens 3RT Series Motor Contactors (S0-S12)

Also known as

Siemens 3RH19 Solid State Auxiliary Siemens Electronic Auxiliary Switch Contactor Solid State Contact

Replaces / compatible with

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

Technical note

Expert tip

The dual NO contacts in the 3RH1921-1FE22, one encapsulated and one not, offer distinct options for signal integrity and environmental protection in sensitive electronic control circuits.

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Frequently asked questions

What are the specific contact types in the Siemens 3RH1921-1FE22 auxiliary switch?

The Siemens 3RH1921-1FE22 auxiliary switch features one normally closed (NC) contact. It also includes two normally open (NO) contacts: one is encapsulated for added protection, and the other is not encapsulated.