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The -S indicates that this unit is equipped with a built-in auxiliary switch for end-stop verification or component interlocking
while the EPDM seat ensures a tight seal up to a 250°F maximum temperature
Whether you are servicing low-temp or medium-temp units
or a failure to establish a flame due to insufficient airflow
the VRG series is designed for dual-purpose operation
Siemens Industrial Controls 3RH1921-1EA20 Contact 326058-757 The -S indicates that thisThe Siemens 3RH1921 1EA20 is a high performance SIRIUS auxiliary switch block designed for veteran contractors and electrical technicians. This side mount auxiliary contact features a 2NO (Normally Open) configuration, specifically engineered for seamless lateral integration with SIRIUS 3RT1 contactors and 3RH1 control relays. Built to withstand rigourous industrial environments, it supports frames from sizes S0 to S12, providing consistent feedback