Where the part sits in the panel
The 1SAZ701903R1013: Anything that lives under Contactor & Starter Accessories & Parts is sized to ride alongside an ABB contactor or motor-protection breaker — aux blocks, shunt trips, busbar links, terminal covers, mechanical interlocks — so the install path is the same DIN-rail foot or snap-on interface the parent contactor uses. Verify the parent frame on the BOM before specifying; a 1000 mm marker in the legacy title string is consistent with an extended wiring or busbar accessory rather than a coil or aux contact, so check it lines up with the contactor's terminal geometry before energizing.