The 3RH19211HA220MA1: The Siemens 3RH1921-1HA22-0MA1 is a front-mounted auxiliary contact block for the SIRIUS 3RT1 contactor series, sizes S0 through S3. It provides 2 normally-open and 2 normally-closed contacts via screw terminals, per EN 50012 mounting standard. The block does not include an ON-OFF indicator. Rated for a 4-pole configuration, this block snaps onto the front of the contactor without additional wiring space on the DIN rail — the panel builder's fill factor stays unchanged.
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The 2NO+2NC contact configuration covers both make and break functions in a single block, which is typical for interlocking, status feedback, or auxiliary control circuits on motor starters. The EN 50012 mounting profile ensures the block aligns with the contactor's front face without adapters. This is a standard interface across the SIRIUS S0–S3 frame sizes, so the same block fits a 3RT1015 (S0) up to a 3RT1035 (S3).