The ABB XT1B 160 TMD 63-630 3P F F is a molded case circuit breaker (MCCB) in the XT1B frame, fitted with a TMD thermal-magnetic trip unit. The 160 A frame size means the breaker's mechanical and thermal design supports continuous current up to 160 A, with the trip unit adjustable or fixed within that envelope — the "63-630" in the order code indicates the trip range the breaker is configured for, not that it carries 630 A continuously. It's a 3-pole unit, fixed version (no plug-in base), with front terminals.
For a panel builder or site engineer, this means the breaker coordinates with downstream loads without needing electronic adjustment. The 160 A frame gives headroom for derating in a warm panel; it's a standard MCCB for motor branch circuits, feeder protection, and distribution in industrial control panels.