What it is and where it sits in the panel
The ABB 1SAM101901R0002 is a front-mounted auxiliary contact block rated 3 A at 400 V with a 2NO contact configuration, sized at 9 mm wide so it drops onto the stack of an MS or MO manual motor starter without consuming an extra DIN module.
Reading the ratings for fit
The 3 A / 400 V envelope is the low-power control-side number, not a power-pole rating — it carries the status, run, or interlock signal off the starter, not the motor load itself, so the real fit check is the contactor's coil current and the downstream relay or input card, not the motor FLA. At 9 mm the block preserves the panel-builder's module count, which is the constraint that usually decides whether the BOM stays frozen or has to be re-issued for width — confirm the host starter's accessory slot before specifying, since that slot is what fixes whether this 9 mm form factor seats cleanly.
Sibling contrast — where the 1NO+1NC part splits
The same-family part 1SAM101901R0001 shares the 9 mm width, 3 A rating, and 400 V ceiling, but ships as 1NO + 1NC, so it is the right second-source only when the wiring diagram calls for a normally-closed contact — using it as a drop-in for a 2NO schematic leaves a circuit that never closes through the NC pole, which is a real operational difference rather than a paperwork one.
Sourcing posture and documentation
As an ABB aux contact, the 1SAM101901R0002 is specified into the BOM and quoted to order against an RFQ — no dealer-shelf claim is being made here, and the declaration pack (nameplate cross-check against the PO line) is the buyer-side control that confirms the correct contact pattern landed on the dock. Compliance documentation against the usual industrial control standards is handled through the ABB declaration pack supplied with shipment; the order code itself does not carry separate certification fields on this listing, so the decl-of-conformity and any applicable IEC / UL markings are read off the paperwork, not the part number string.