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Siemens 3RH1921-1FA04: 4 NC Attachable Auxiliary Block

Siemens 3RH1921-1FA04: 4 NC attachable auxiliary contact block.

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ManufacturerSiemens

Part number3RH1921-1FA04

Type Attachable Auxiliary Block

Contacts 4 NC

Standards EN 50005

Series SIRIUS 3RH19

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4 normally closed (NC) contacts Attachable design for easy mounting EN 50005 compliant For Siemens contactors

Product description

The Siemens 3RH1921-1FA04 is an attachable auxiliary contact block featuring four normally closed (NC) contacts. It conforms to EN 50005 standards and is designed for easy attachment to compatible Siemens contactors, expanding their control capabilities. This block is particularly useful for safety-related circuits or interlocking functions that require normally closed contacts.

This auxiliary block finds application in industrial control systems where fail-safe operations are critical. It can be utilized in motor control circuits, emergency stop systems, and safety interlocks across industries such as manufacturing, material handling, and process control.

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Technical specifications

Type	Attachable Auxiliary Block
Contacts	4 NC
Standards	EN 50005
Series	SIRIUS 3RH19

Common applications

Safety interlocks

Fail-safe circuits

Motor control

Industrial control panels

Machine safety

Automation systems

Compatible systems

Compatible with Siemens Contactors (S0-S12)

Also known as

Siemens 3RH19 Block Siemens 4 NC Auxiliary Contactor Auxiliary Contact

Replaces / compatible with

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

Technical note

Expert tip

When attaching the 3RH1921-1FA04, ensure it is securely fastened to the contactor to guarantee reliable electrical connections and mechanical integrity.

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Frequently asked questions

What is the contact configuration of the Siemens 3RH1921-1FA04 attachable block?

The Siemens 3RH1921-1FA04 attachable block is configured with four normally closed (NC) contacts. These contacts are compliant with EN 50005 standards and are suitable for various control and safety applications.