3RH1921-1DA11

The 3RH1921-1DA11 is an auxiliary switch group mounted on the first side of the SIRIUS 3RT1 contactor. It has one normally open and one normally closed contact group, screw terminal wiring, conforms to EN50012 standard, is suitable for contactors of sizes S0 to S12, and has a mechanical life of 10 million cycles.

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Siemens SIRIUS 3RH1921-1DA11 Side-mounted 1NO1NC Auxiliary Switch Assembly

Product Positioning

3RH1921-1DA11 is the first side-mounted auxiliary switch dedicated to Siemens SIRIUS 3RT1 series contactors, providing one set of normally open and one set of normally closed contacts, and conforming to EN50012 installation specifications.

Core Product Advantages and Features

1NO+1NC switching contact

It provides both normally open and normally closed signals, making it suitable for interlocking and status monitoring circuits.

Side-mounted quick-release installation

It is snap-on mounted on the side of the 3RT1 body for quick installation.

Screw terminal wiring

Standard 10mm screw terminals make wiring installation simple and secure.

Compliant with EN50012 standard

It adopts the EN50012 installation dimension standard and is highly compatible with products in the same series.

project	Specification
Contact configuration	1 NO + 1 NC
Installation method	Side-mounted (first group), screw terminal
Applicable size	S0...S12 (3RT1 series contactors)
Applicable Standards	EN 50012
Mechanical/Electrical Life	Approximately 10 million / 200,000 operation cycles

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