What this MCCB is and where it fits
This is a Siemens SENTRON 3VA1112-4ED36-0AA0 molded case circuit breaker (MCCB) — a 3-pole, 125 A rated line-protection device with a TM210 thermal-magnetic trip unit. It's designed for main or feeder protection in distribution panels, switchboards, and motor control centers. The 125 A frame at 40 °C through 50 °C holds full rating, then derates gradually to 114 A at 70 °C, which matters if your panel runs hot near a drive or transformer. The 121 kA breaking capacity at 240 V AC gives you serious fault-current headroom for high-available-fault installations. Active in production (lifecycle stage: current).
Breaking capacity across voltages — what it means for your panel
The interrupting rating changes with system voltage, and you need to match it to your available fault current. At 240 V it's 121 kA; at 415 V it's 75.6 kA; at 440 V it's 52.5 kA; at 500 V and 690 V it drops to 11.9 kA. That 11.9 kA at 690 V is the number to check if you're in a 690 V industrial distribution — it's still adequate for many installations but not the highest in the class. The rated insulation voltage is 800 V, so the breaker itself is insulated for that level even if the interrupting rating is lower at the high end.
Physical fit and panel integration
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That's a standard 3-pole MCCB footprint for this class — it'll drop into the same mounting holes and bus-bar spacing as other SENTRON 3VA frame breakers. The front face carries an IP40 protection rating, so it's fine for indoor panel use but not for washdown areas. No undervoltage release, no shunt trip, no communication module on this variant — it's a straight thermal-magnetic breaker with a trip indicator (no) and no ground-fault monitoring. Power loss at rated load is 28.1 W, which adds to your enclosure heat budget.