What this MCCB brings to the panel
The Siemens 3VA1112-6EF36-0HC0 is a SENTRON molded case circuit breaker built for line protection — 3-pole, rated 125 A continuous at 40 °C, and packing a 220 kA interrupting capacity at 240 V. That SCCR number means it can clear a fault upstream without the arc flash propagating to the next breaker; you coordinate selectivity downstream from here. The shunt trip release (STL) on this variant lets you drop the breaker remotely via a control signal — useful for emergency-stop chains or automated load shedding. It ships with two HQ auxiliary switches for status feedback to the PLC or panel indicators.
Interrupting curve across voltages
The interrupting rating drops as voltage climbs: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 17 kA floor at 690 V still covers most industrial motor-drive panels; if your fault current exceeds that at the higher voltage, you'll need a current-limiting upstream device or a higher-rated frame.
Thermal derating and panel fit
Rated 125 A from 40 °C through 50 °C; above that it derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. If your enclosure runs hot — say a sealed panel near a furnace line — size your load at the 70 °C figure, not the nameplate. The 3VA frame is 76.2 mm wide (3 in), 130 mm tall, 70 mm deep; it snaps onto a DIN rail or bolts to a mounting plate. The 800 V rated insulation voltage (Ui) gives headroom for 480/600 V systems.