What this part is
The ABB 1SDA076418R1 is a lever lucid plate for the XT4 series of molded case circuit breakers (MCCBs). It is a panel-mount label that identifies the breaker's handle position — open, closed, or tripped — through a clear window. This is an accessory, not the breaker itself; order it alongside the XT4 MCCB for a complete, legible installation.
Where it fits
Snaps onto the XT4 breaker's operating mechanism cover. The lucid plate lets an operator see the lever position without opening the panel door. Check the XT4 mounting template for cutout dimensions — the plate sits flush with the escutcheon, so the panel cutout must clear the lever travel arc.