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Siemens 3RH1921-1EA20: 2 NO Lateral Auxiliary Switch for 3RT1

Siemens 3RH1921-1EA20: 2 NO lateral auxiliary switch for 3RT1 contactors.

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ManufacturerSiemens

Part number3RH1921-1EA20

Type Lateral Auxiliary Switch

Contacts 2 NO

Terminal Type Screw

Compatibility Siemens 3RT1 Contactors

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2 normally open (NO) contacts Lateral mounting Screw terminal connections Designed for Siemens 3RT1 contactors

Product description

The Siemens 3RH1921-1EA20 is a lateral auxiliary switch block equipped with two normally open (NO) contacts. It is designed for attachment to Siemens 3RT1 series contactors and utilizes screw terminals for connection. This accessory expands the functionality of the base contactor by providing additional signaling or control points.

This auxiliary switch is integral for applications requiring monitoring of contactor status or implementing additional control logic in automation systems. It is commonly found in motor control circuits, safety interlocks, and status feedback systems across various manufacturing and industrial environments.

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Technical specifications

Type	Lateral Auxiliary Switch
Contacts	2 NO
Terminal Type	Screw
Compatibility	Siemens 3RT1 Contactors
Series	SIRIUS 3RH19

Common applications

Motor control

Status feedback

Control logic expansion

Safety interlocks

Industrial automation

Compatible systems

Siemens 3RT1 Series Contactors

Also known as

Siemens 3RH1921 Switch Siemens 2 NO Auxiliary 3RT1 Auxiliary Contact

Replaces / compatible with

This is a phased-out accessory for Siemens 3RT1 contactors. The successor series is SIRIUS 3RH2.

Technical note

Expert tip

Ensure the correct lateral mounting orientation on the 3RT1 contactor for the 3RH1921-1EA20 to engage properly and function as intended.

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Frequently asked questions

What type of contacts does the Siemens 3RH1921-1EA20 auxiliary switch feature?

The Siemens 3RH1921-1EA20 auxiliary switch block is equipped with two normally open (NO) contacts. These contacts are used to provide additional signaling or control circuits in conjunction with Siemens 3RT1 contactors.