Siemens SENTRON 3VA1112-4FE46-0AA0 — 125 A 4-Pole MCCB with TM220 Release
The interrupting capacity reaches 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that govern its use in high-fault-current distribution panels where selectivity with downstream breakers is required. The TM220 release provides adjustable thermal (overload) and fixed magnetic (short-circuit) trip characteristics. The adjustable li response value maxes at 1250 A, giving some flexibility to coordinate with downstream motor starters or feeder breakers. Insulation voltage is rated at 800 V, and the unit accepts DC operation up to 600 V — relevant for battery-bank or UPS output protection.
The 101.6 mm width (4 inches) is the standard 4-pole MCCB footprint for the SENTRON 3VA platform — it occupies four 25.4 mm pole positions on a DIN rail or mounting plate.
Operating Range and Environment
The 70 °C operating ceiling matches the derating curve endpoint — at that temperature the continuous current drops to 114 A, so a 125 A load at 70 °C would nuisance-trip. The 800 V insulation voltage allows use in 690 V systems with adequate clearance, and the 600 V DC rating covers most industrial DC bus voltages up to 500 V nominal.