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Siemens 3RH1921-1LA11 2-Pole Auxiliary Switch Block - 1 NO + 1 NC

Siemens 3RH1921-1LA11 SIRIUS auxiliary switch block (1 NO + 1 NC).

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ManufacturerSiemens

Part number3RH1921-1LA11

Poles 2

Contact Configuration 1 NO + 1 NC

Termination Screw Terminal

Cable Entry Top

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1 Normally Open (NO) contact 1 Normally Closed (NC) contact Screw terminal connections Top cable entry Snap-on mounting SIRIUS series

Product description

The Siemens 3RH1921-1LA11 is a 2-pole auxiliary switch block from the SIRIUS series, designed for use with motor contactors. It features a contact configuration of 1 Normally Open (NO) and 1 Normally Closed (NC) contact, utilizing screw terminal connections for secure wiring. The unit is designed for top mounting and has cable entry at the top, adhering to EN 50005 standards.

This auxiliary switch block is commonly employed in motor control circuits to provide additional signaling or interlocking functions for contactors. Its applications span across various industrial sectors, including manufacturing, material handling, and machine building, where reliable electrical control and safety are paramount.

Stanlo Automation, a veteran-owned surplus parts distributor, offers this Siemens 3RH1921-1LA11 auxiliary switch block. We provide a dependable source for automation components, ensuring your operational needs are met with quality surplus parts.

Technical specifications

Poles	2
Contact Configuration	1 NO + 1 NC
Termination	Screw Terminal
Cable Entry	Top
Standard	EN 50005
Protection Class	IP20
Rated Voltage	690 VAC / 600 VDC

Common applications

Motor Control

Contactor Relays

Industrial Control Panels

Machine Automation

Electrical Systems

Compatible systems

Siemens motor contactors (3RT size 0-12)

Also known as

Siemens 3RH1921-1LA11 Auxiliary Contact Block SIRIUS 3RH1921-1LA11 Siemens Contactor Auxiliary

Replaces / compatible with

This part is phased out, and its successor is the SIRIUS 3RH2 series. It was designed for use with Siemens motor contactors.

Technical note

Expert tip

This auxiliary switch block is designed for snap-on mounting to the front of compatible Siemens motor contactors.

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Frequently asked questions

What is the successor to the Siemens 3RH1921-1LA11 auxiliary switch block?

The Siemens 3RH1921-1LA11 auxiliary switch block is a phased-out product. Its successor is the SIRIUS 3RH2 series. This change reflects ongoing product development and potential upgrades in performance or features.