Siemens 3RH1921-1MA02 Auxiliary Switch Block - 2 NC

Siemens 3RH1921-1MA02 2-pole auxiliary switch block with 2 NC contacts.

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ManufacturerSiemens

Part number3RH1921-1MA02

Contacts 2 NC

Poles 2

Terminal Type Screw

Standards EN 50005

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2 NC configuration Screw terminal connections EN 50005 compliant Cable entry at the bottom Phased-out product

Product description

The Siemens 3RH1921-1MA02 is a 2-pole auxiliary switch block featuring 2 normally closed (NC) contacts, designed for motor contactors. It conforms to EN 50005 standards and offers cable entry at the bottom, with screw terminals for connection.

This auxiliary switch block is ideal for control circuits requiring normally closed contacts, such as safety interlocks or signaling fault conditions. It is widely used in industrial automation, machine building, and process control systems.

As a veteran-owned surplus parts distributor, Stanlo Automation provides reliable access to essential components like the Siemens 3RH1921-1MA02, ensuring your automation projects are supported with quality parts.

Technical specifications

Contacts	2 NC
Poles	2
Terminal Type	Screw
Standards	EN 50005
Cable Entry	Bottom
Product Type	Auxiliary Switch Block

Common applications

Motor control

Control panels

Automation systems

Safety circuits

Interlocking

Fault signaling

Compatible systems

Siemens Motor Contactors (verify specific model and size)

Also known as

Siemens 3RH1921-1MA02 SIRIUS auxiliary switch Siemens 2NC auxiliary

Replaces / compatible with

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

Technical note

Expert tip

The bottom cable entry of this auxiliary switch block can simplify wiring in certain control panel designs, especially when mounted below the contactor.

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Frequently asked questions

What is the contact type and cable entry direction for the Siemens 3RH1921-1MA02 auxiliary switch block?

The Siemens 3RH1921-1MA02 auxiliary switch block features 2 normally closed (NC) contacts and has its cable entry positioned at the bottom.