What it is
The ABB 1SAM450000R1004 is a manual motor starter accessory for the MS-series manual starter housing, used to actuate or extend a motor circuit on the DIN rail. Listed as a motor starter manual from ASEA BROWN BOVERI, the legacy brand carried on ABB motor-protection accessories in this range. Listed under circuit breakers, fuses and protection, then contactors and starters, then contactor and starter accessories and parts — so it lives one level down from the starter housing itself and reads as a panel-side accessory rather than a standalone breaker or contactor.
Where the class is used
Manual motor starter accessories in the ABB MS line sit alongside the rotary or toggle-operated starter housings — used to extend a starter with auxiliary contacts, shunt trips, or undervoltage releases that the base housing does not carry on its own. The point is to add a function (signal feedback, remote trip, or coil-driven release) without pulling a separate full-size contactor into the panel.