What this order code is
The 1SBL157001R1301: That class sits in the broader Circuit Breakers, Fuses & Protection tree, which is where the panel-side switching duty for small-frame contactors normally gets specified.
Sourcing posture
Sourcing runs through the ABB channel quoted to order against an RFQ; that's the path to confirm current availability, lead time, and any active successor for a panel that needs this exact code on the BOM.