Square D PowerPact I-Line Circuit Breaker
Cat# LGA36400U43X 
LG 400
400 Amp
3 Pole
600 Volt
Micrologic 5.3A Trip Unit with LSI Functions
Interrupting Ratings:
UL/CSA/NEMA:
     65kA @ 240 Volt AC
     35kA @ 480 Volt AC
     18kA @ 600 Volt AC
IEC 60947-2
     65kA @ 220/240 Volt AC
     35kA @ 380/440 Volt AC
     18kA @ 500/525 Volt AC
Load Side Lugs
New Surplus Take-Out
(Removed From New Panel That Was Never Energized)

(Loc: Top Shelf I-line Aisle)