3RH1921-1CD10
The Siemens SIRIUS 3RH1921-1CD10 pre-amplifier switch features one set of early-closing normally open auxiliary contacts and screw terminals. It is mounted on the front of the 3RT1 series contactor and is suitable for timing control circuits such as star-delta start.
Product Positioning
The 3RH1921-1CD10 is a pre-positioned auxiliary switch module from the Siemens SIRIUS series. Through its pre-closing normally open contact design, it helps the contactor provide signal output in advance during the operating procedure.
Core Product Advantages and Features
Early closure design
The contacts close in advance before the main contactor operates, which is suitable for control circuits that require timing coordination.
Front snap-fit installation
It can be directly snapped onto the front of the 3RT1 series contactor, requiring no additional wiring space.
Screw terminal wiring
Using screw terminals makes wiring and installation convenient and on-site maintenance and repair easy to identify.
Compatible with multiple chassis
It is applicable to various contactor frame sizes from S0 to S12.
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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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3RH1921-1CD01
The Siemens SIRIUS 3RH1921-1CD01 pre-amplifier switch features one set of delayed-opening normally closed auxiliary contacts with screw terminals. It is mounted on the front of the 3RT1 series contactor and is suitable for timing control and interlocking circuit designs.
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3RH1921-1CA10
The Siemens SIRIUS 3RH1921-1CA10 pre-amplifier switch features one set of instantaneous normally open auxiliary contacts, a 10A/690V screw terminal design, and snap-fit mounting on the front of the 3RT1 series contactor, ensuring stable signal feedback.