The Siemens 3VA4112-5ED34-3AA0 is a 3-pole circuit breaker from the 3VA4 series, built on a UL Frame 125 platform. It's rated for 125 A continuous current with a 35 kA interrupting capacity at 480 V, placing it in the 'M' (medium) breaking capacity class. The TM210 trip unit provides fixed thermal-magnetic line protection: overload protection Ir is permanently set at 125 A, and the short-circuit pickup Ii is fixed at 10 times the rating (1250 A). This is a made-to-order unit (Product class C), so it's not a stocked shelf item — expect lead time and no returns.
Mounts on a standard DIN rail in a panel enclosure. The 3-pole format and UL 489 listing make it a direct fit for North American distribution panels and industrial control panels requiring branch circuit protection. The fixed Ir and Ii settings simplify specification — no adjustment dials to lock or mis-set on the line.