Siemens 3VA1112-6MH36-0DC0 Circuit Breaker, 125A, 70kA @ 415

The Siemens 3VA1112-6MH36-0DC0 is a 3-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at 125 A with a breaking capacity class H — Icu = 70 kA at 415 V. That 70 kA interrupting rating means it can safely clear a fault current up to that level without the arc flashing over or damaging downstream gear, which is the kind of headroom you want on a high-capacity distribution board or a motor control center feeding large drives. The breaker is configured for starter protection with a TM120M thermal-magnetic trip unit — the TM120M gives you an adjustable magnetic trip range of 5 to 15 times In (so 625 A to 1875 A at 125 A In), letting you dial in short-circuit protection to match the inrush of a motor starter without nuisance tripping. Note that this variant ships without overload protection (the TM120M covers short-circuit only here; overload coordination is handled externally by the starter overload relay). It includes an undervoltage release (UVR) rated for 208-230 V AC, 50/60 Hz, plus two auxiliary switches (HQ type). The UVR will trip the breaker if the control voltage drops below the dropout threshold — a standard safety interlock for conveyors or pumps that must not auto-restart after a power dip. The clamp connection terminals accept solid or stranded copper up to the frame's rated cross-section, which saves panel wiring time versus screw terminals.