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Siemens 3RH2921-1DA02 Side-Mount Auxiliary Switch - 2 NC

Siemens 3RH2921-1DA02 side-mount auxiliary switch with 2 NC contacts.

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ManufacturerSiemens

Part number3RH2921-1DA02

Contact Configuration 2 NC

Mounting Side

Terminals Screw

Compatibility 3RT2 Contactors (S00-S3), 3RH2 Contactor Relays

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2 Normally Closed (NC) contacts Side-mounted design Screw terminals Snap-on mounting For 3RT2 and 3RH2 devices

Product description

The Siemens 3RH2921-1DA02 is a lateral (side-mounted) auxiliary switch block featuring 2 Normally Closed (NC) contacts. Designed for use with SIRIUS 3RT2 contactors and 3RH2 contactor relays, this auxiliary switch utilizes screw terminals for a secure connection. It is engineered to easily snap onto the side of compatible contactors, expanding their control circuit functionality.

This side-mounted auxiliary switch is ideal for applications requiring additional NC contacts for safety interlocks, status feedback, or control logic within industrial automation systems, motor control centers, and machine building environments. Its placement on the side of the contactor allows for flexible mounting configurations.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3RH2921-1DA02. We are dedicated to providing quality components and reliable service to keep your operations running efficiently.

Technical specifications

Contact Configuration	2 NC
Mounting	Side
Terminals	Screw
Compatibility	3RT2 Contactors (S00-S3), 3RH2 Contactor Relays
Series	SIRIUS 3RH29

Common applications

Motor control

Safety circuits

Control panel wiring

Industrial automation

Machine safety

Compatible systems

Siemens 3RT2.1 (S00) Siemens 3RT2.2 (S0) Siemens 3RT2.3 (S2) Siemens 3RT2.4 (S3) Siemens 3RH2

Also known as

Siemens 3RH29211DA02 SIRIUS Side Auxiliary Contact 3RH2921-1DA02 Auxiliary Switch Block

Replaces / compatible with

This auxiliary switch adds 2 NC contacts to the side of Siemens 3RT2 contactors and 3RH2 contactor relays.

Technical note

Expert tip

Only one side-mounted auxiliary switch (3RH2921-1DA02) can typically be installed per contactor, but front-mounted auxiliaries are also available.

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Frequently asked questions

Can the Siemens 3RH2921-1DA02 auxiliary switch be mounted on the front of a contactor?

No, the Siemens 3RH2921-1DA02 is specifically designed for side mounting on 3RT2 contactors and 3RH2 contactor relays. It snaps onto the side of the device to provide additional NC contacts.