What it is and what it does
The Siemens SENTRON 3VA1010-3ED32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, built for line protection in distribution panels. It carries a TM210 thermal-magnetic release — the thermal element handles overloads, the magnetic element handles short circuits — so it's a straightforward fit for feeder or main breaker duty where you don't need electronic adjustability or communication. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That SCCR headroom means it can sit upstream of a fault-hungry motor branch without worrying about cascading failure — the breaker clears a bolted fault before the arc has time to propagate to the bus.
Ratings and what they mean for fit
Rated continuous current Iu holds at 100 A from 40 °C up through 50 °C ambient. It starts to derate at 55 °C (96 A), dropping to 90 A at 70 °C. If you're packing this into a hot enclosure — say a non-vented panel next to a drive — that derating curve matters. The 100 A rating is real at typical panel ambients, but you lose 10 A by the time you hit 70 °C inside the box. Rated insulation voltage Ui is 800 V, so the breaker's internal creepage and clearance are designed for 690 V systems. The 690 V breaking capacity is 7.5 kA — enough for most industrial 690 V distribution, but check your available fault current if you're on a high-capacity transformer. This version includes an undervoltage release (UVR) — part number 3VA9608-0BB11 — so if your control voltage drops, the breaker trips. That's a common spec for machinery safety circuits where a loss of control power needs to drop the main disconnect. No auxiliary contacts, no voltage trigger, no communication module on this variant.
Where it goes and how it mounts
It's a DIN-rail-mounted MCCB — 76.2 mm wide (roughly 3 inches), 130 mm tall, 70 mm deep. That 70 mm depth is the dimension that matters when you're laying out a shallow enclosure; it's the same depth class as most SENTRON 3VA breakers in this frame size, so it swaps into an existing panel without re-drilling the gland plate. Front protection is IP40 — fine for a clean indoor panel, but keep it behind a door if there's washdown or dust in the room. No IP rating on the terminals themselves; they're live when the breaker is open, so standard finger-safe terminal shrouds are a good call if the panel gets opened hot.