What the 50 A fixed trip means for your feeder
The A1A050TW-1: That makes it a straight swap for a 50 A feeder or motor branch circuit where the load current is known and won't change. The 'A1A 100' frame means the breaker sits in the ABB A1A 100 platform — a compact MCCB line for panelboard and distribution boards up to 100 A frame. The thermal-magnetic trip gives you inverse-time overload protection (thermal) plus instantaneous short-circuit pickup (magnetic), both fixed at the 50 A mark.
Lifecycle reality — eol_hot means order while you can
If you need a drop-in replacement, you'll need to check the A1A 100 family's current catalogue for a comparable fixed-trip thermal-magnetic MCCB with the same frame and 50 A rating. The page does not carry a direct pin-compatible alternative.
Sourcing this MCCB — quoted to order
The A1A050TW-1 is sourced through independent distribution channels. For a line-down spare or a BOM freeze, send the quantity and target lead time; the desk will quote against the available channel inventory.