What this MCCB is and what the ratings mean
The Siemens 3VA2010-5HN36-0BA0 is a SENTRON molded case circuit breaker (MCCB) sized for a 1 200 A frame but fitted with a 100 A continuous-current rating — so it gives you the mechanical and interrupting muscle of a large frame while protecting a 100 A feeder. That 100 A holds flat across the full ambient range from 40 °C to 70 °C, no derating curve to worry about when the panel runs hot. Three poles, line-protection design, and an integrated undervoltage release (UVR) — that UVR drops the breaker if control voltage is lost, which is standard for emergency-stop or safety-disconnect schemes where you want the load isolated on a power-loss event. Interrupting capacity is where this frame earns its keep: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V is serious — it handles high-fault conditions on the secondary side of a step-down transformer without needing a current-limiting fuse ahead of it.
Where it goes and how it mounts
This is a panel-mount MCCB — 181 mm tall, 105 mm wide, 86 mm deep. It bolts into a switchboard or distribution panel on a mounting plate, not a DIN rail. The 105 mm width is the standard 3-pole SENTRON 3VA footprint, so if you're swapping into an existing panel that was laid out for a 3VA frame, it drops in without re-drilling the backplate. Rated insulation voltage is 800 V. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.