The Siemens 3RH1921-2FA31 is a front-mounting auxiliary switch block from the SIRIUS 3RH19 series, designed to expand the control circuit capacity of SIRIUS 3RT1 power contactors and 3RH1 contactor relays in sizes S0 through S12. It features a 3 NO + 1 NC contact configuration with spring-loaded (cage clamp) terminals, providing maintenance-free, vibration-resistant connections for signaling and interlocking circuits.
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