3RH1921-2EA02
The Siemens SIRIUS 3RH1921-2EA02 is a first-side mounted auxiliary switch module with two normally closed (2NC) contacts and spring-loaded terminal wiring. It is suitable for 3RT1 series motor contactors of sizes S0 to S12 and is commonly used in power outage monitoring circuits.
Product Positioning
The 3RH1921-2EA02 is an older side-mounted auxiliary switch module of the SIRIUS 3RH19 series. Both contacts are normally closed (2NC) and spring-loaded terminal blocks are used. It is suitable for 3RT1 series contactors of sizes S0 to S12.
Core Product Advantages and Features
2NC double normally closed contact
Both sets of contacts are normally closed, making them suitable for use as power failure detection or safety interlock signals.
Spring-loaded terminal wiring
The screwless locking design allows for quick wiring and is vibration-resistant, preventing loosening.
Applicable to sizes S0 to S12
The compatibility range covers small to medium-sized 3RT1 series contactors.
First side-mounted structure
It is secured to the contactor body by a side snap-fit, making installation and disassembly convenient.
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3RH1921-2JA11
The Siemens SIRIUS 3RH1921-2JA11 is a second-side-mounted auxiliary switch module with 2 poles, 1 NO + 1 NC contacts, and spring-loaded (cage clamp) terminals for quick wiring. It is suitable for expanding the 3RT1 series motor contactors of sizes S3 to S12.
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3RH1921-2DE11
The Siemens SIRIUS 3RH1921-2DE11 is a side-mounted auxiliary switch module with a 1NO+1NC contact configuration, cage clamp terminal wiring, and is suitable for 3RT1 series contactors of sizes S0 to S12. The operating temperature range is -25 to 60 degrees Celsius.
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3RH1921-2DA11
The Siemens SIRIUS 3RH1921-2DA11 is a side-mounted auxiliary switch module with a 1NO+1NC contact configuration, cage clamp terminal wiring, 10A/24-230V AC rated, suitable for 3RT1 series contactors of sizes S0 to S12, and has a mechanical life of tens of millions of cycles.