What the interrupting ratings mean for coordination
The Siemens SENTRON 3VA2010-5HN32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 100 A continuously from 40 °C through 70 °C — no derating needed across that span, per the datasheet. The interrupting capacity tells you where this breaker fits in a selective coordination study: 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. Those numbers are the fault current it can safely clear at each voltage level without welding contacts or rupturing the case. For a 480 V panel with a 65 kA available fault current, this unit gives you nearly 10 kA of headroom above a standard 65 kA-rated MCCB — useful when the transformer is close to the main switchboard.
Trip unit and auxiliary contact configuration
The overcurrent release is an ETU350 electronic trip unit — that is the programmable, curve-shaping type, not a fixed thermal-magnetic. It gives you adjustable long-time, short-time, instantaneous, and ground-fault pickup and delay settings, which is what you need for selective coordination downstream of a larger feeder. The auxiliary contact version fitted here is 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ — five contacts total, covering status, trip indication, and alarm. The trip indicator and voltage trigger are both present, so you get a local mechanical flag plus the ability to trigger a remote shunt trip coil. Rated insulation voltage Ui is 800 V, which covers 480 V and 600 V class systems within tolerance.
Panel fit and environmental limits
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — standard 3-pole MCCB footprint for a 100 A frame. The front face carries IP40 protection, meaning tools or fingers won't contact live parts, but the enclosure itself needs to be in a cabinet rated for the environment. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 13.5 W — relevant for thermal calculations inside a sealed enclosure with other heat sources.