What it is and what it does
The Siemens 3VA1112-4ED46-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in 4-pole applications, carrying a continuous rating of 125 A from 40 °C up through 50 °C before it starts to derate — 122 A at 55 °C, 120 A at 60 °C, on down to 114 A at 70 °C. That thermal curve means in a warm panel you still get the full 125 A unless the ambient is pushing past 50 °C. The TM210 overcurrent release handles the trip curve; there's no undervoltage release, no ground-fault monitoring, and no communication module on this variant — it's a straight line-protection breaker for a distribution board.
Breaking capacity — what the ratings mean for coordination
The interrupting ratings are the headline here: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA at 240 V tells you this breaker is built for high-fault locations — think transformer secondary or a large service entrance where available fault current is serious. At 415 V, 75.6 kA still gives you plenty of headroom for most industrial distribution panels. The 11.9 kA at 690 V is what you'd see on a 690 V motor control center feeder; it's not a high-end figure for that voltage class but it's adequate for many MCC applications. For a site electrical engineer working selectivity, the 4-pole design means you can use it on a 3-phase + neutral system and coordinate with downstream breakers.
Panel fit and mounting
Dimensions are 70 mm deep, 101.6 mm wide (4 inches), and 130 mm tall. The 4-inch width is standard for a 4-pole MCCB in this frame size — it'll drop into a panel that's laid out for a SENTRON 3VA footprint without surprises. Front IP40 protection means it's fine for a dry indoor panel; keep it out of washdown zones. Power loss runs 28.1 W maximum at rated load, so factor that into your enclosure thermal calculations if you're packing several breakers in a small cabinet. Storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C.
What it doesn't have — so you don't order the wrong variant
No trip indicator, no undervoltage release, no voltage trigger, no communication function, no ground-fault monitoring, and no other measurement function. This is the bare-bones line-protection version. If you need any of those features — say, an undervoltage release for a safety circuit, or ground-fault alarm on a feeder — you need a different suffix on the 3VA order code. The TM210 release is the thermal-magnetic type, not electronic, so trip curve adjustment isn't available on this variant.