3RH1921-1KA20

The 3RH1921-1KA20 is a dedicated second-side auxiliary switch assembly for the SIRIUS 3RT1 contactor. It features 2 NO contacts, screw terminal wiring, conforms to EN50005 standard, is suitable for S3~S12 size contactors, has a mechanical operation life of up to 10 million cycles, and is stable and durable.

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Siemens SIRIUS 3RH1921-1KA20 Side-mounted 2NO Auxiliary Switchgear

Product Positioning

The 3RH1921-1KA20 is a second side-mounted auxiliary switch for Siemens SIRIUS 3RT1 series contactors, providing two sets of normally open (NO) contacts for easy expansion of control circuit signal feedback.

Core Product Advantages and Features

2NO contact configuration

It provides two sets of normally open auxiliary contacts, which can be used as operation status feedback signals.

Side-mounted quick-release installation

It adopts a snap-on side mounting method, which can be installed on the side of the 3RT1 body without removing the main contactor.

Screw terminal wiring

The 10mm screw terminal design ensures secure wiring and facilitates maintenance and on-site construction.

Conforms to international standards

It complies with EN50005 standards and has obtained multiple certifications such as CE, UL, and CSA.

project	Specification
Contact configuration	2 NO (Normal Open)
Installation method	Side-mounted (second set), screw terminal
Applicable size	S3...S12 (3RT1 series contactors)
Applicable Standards	EN 50005
Mechanical/Electrical Life	Approximately 10 million / 200,000 operation cycles
Ambient temperature	Operating temperature: -25°C to +60°C; Storage temperature: -55°C to +80°C

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3RH1921-1MA20

The Siemens SIRIUS 3RH1921-1MA20 is an auxiliary switch module with a 2-pole structure, bottom-entry screw terminal wiring, and snap-fit installation on the motor contactor body. The original manufacturer's data indicates that it has been discontinued, and it will be supplied by the SIRIUS 3RH2 series.

3RH1921-1KA11

The 3RH1921-1KA11 is an auxiliary switch assembly mounted on the second side of the SIRIUS 3RT1 contactor. It has one normally open contact and one normally closed contact, screw terminal wiring, conforms to EN50005 standard, and is suitable for contactors of sizes S3 to S12, facilitating the expansion of control signals.

3RH1921-1JA11

The 3RH1921-1JA11 is an auxiliary switch assembly mounted on the second side of the SIRIUS 3RT1 contactor. It has one normally open contact and one normally closed contact, screw terminal wiring, conforms to EN50012 standard, is suitable for contactors of sizes S3 to S12, and is reliable and durable.