What it is — and what that 100 A rating really means for your panel
This Siemens SENTRON 3VA2010-5HN32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed until you hit the top of that band. That 100 A holds steady at every temperature step in between, so you're not losing headroom on a hot summer day in a packed enclosure. It's designed for line protection, meaning it guards the feeder or main bus, not a specific motor or load branch. The interrupting ratings are where this thing earns its keep in a distribution panel: 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 figure at 240 V tells you it can handle a dead-short downstream of a large transformer without the arc flash energy getting away from you. The 690 V rating drops to 3 kA, so if you're on a 690 V system, you need to verify your available fault current is below that.
Built-in undervoltage release — what it saves you in the field
This MCCB comes with an undervoltage release (UVR) as part of the order code, so it drops the breaker if the control voltage sags or fails. Out here in the grease, that means a motor feeder on this breaker won't re-close automatically after a brownout — you have to manually reset it, which beats the alternative of a machine starting up unexpectedly while someone's reaching into a drive cabinet. The UVR is designed as an auxiliary release, not a shunt trip, so it's the right choice for undervoltage protection per code.
Current lifecycle, dimensions, and panel fit
Rated insulation voltage is 800 V. Maximum power loss is 16 W at rated current. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. That covers unheated warehouses and outdoor enclosures in most climates.