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Siemens 3RH1921-1FA31: 3 NO + 1 NC Attachable Auxiliary Block

Siemens 3RH1921-1FA31: 3 NO + 1 NC attachable auxiliary contact block.

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ManufacturerSiemens

Part number3RH1921-1FA31

Type Attachable Auxiliary Block

Contacts 3 NO + 1 NC

Standards EN 50005

Series SIRIUS 3RH19

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3 normally open (NO) and 1 normally closed (NC) contacts Attachable design EN 50005 compliant Versatile contact combination

Product description

The Siemens 3RH1921-1FA31 is an attachable auxiliary contact block configured with three normally open (NO) and one normally closed (NC) contact. Compliant with EN 50005 standards, this block is designed for straightforward attachment to compatible Siemens contactors, offering enhanced control and signaling capabilities.

This auxiliary block is suitable for applications requiring a predominance of normally open contacts, such as initiating control sequences or providing status signals, while retaining a normally closed contact for safety or interlocking functions. It is widely used in motor control centers and machine automation.

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Technical specifications

Type	Attachable Auxiliary Block
Contacts	3 NO + 1 NC
Standards	EN 50005
Series	SIRIUS 3RH19

Common applications

Motor control centers

Machine automation

Control panels

Sequence control

Status signaling

Industrial systems

Compatible systems

Compatible with Siemens Contactors (S0-S12)

Also known as

Siemens 3RH19 3NO 1NC Siemens Auxiliary Block Contactor Accessory

Replaces / compatible with

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

Technical note

Expert tip

When using the 3RH1921-1FA31, verify that the NO contacts are used for signaling and initiation, while the NC contact is utilized for safety or interlocking functions.

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Frequently asked questions

What is the contact arrangement of the Siemens 3RH1921-1FA31 attachable block?

The Siemens 3RH1921-1FA31 attachable block provides a combination of three normally open (NO) and one normally closed (NC) contact. This configuration is compliant with EN 50005 standards and offers flexibility for control and interlocking circuits.