What this MCCB carries and where it fits
The Siemens SENTRON 3VA2110-5JP32-0AH0 is a 3-pole molded case circuit breaker rated for 100 A continuous current (Iu) with an ETU550 electronic trip unit. It is configured for line protection — meaning the trip curve and accessories are set for feeder or main breaker duty rather than motor branch protection. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. That 187 kA figure at 240 V is the headline — it clears high-fault scenarios on the secondary side of a 480 V–208Y/120 V transformer or a 240 V delta service without upstream fuses needing to coordinate. Thermal derating is published from 40 °C through 70 °C: it holds 100 A up to 50 °C, then drops to 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If the panel ambient runs hot, that curve tells you the real continuous current you can count on without nuisance tripping. Footprint: 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is the standard 3-pole MCCB form factor for the SENTRON 3VA2 frame — it drops into the same panel cutout and bus-bar spacing as other 3VA2 breakers of the same pole count.
Trip unit and auxiliary contact configuration
The ETU550 is an electronic trip unit with communication function, meaning it can interface with a higher-level monitoring system for power data and trip event logging. It is not a basic thermal-magnetic — it gives you adjustable long-time, short-time, instantaneous, and ground-fault pickup settings, though ground-fault monitoring is not fitted on this variant. Auxiliary contact version is 2 auxiliary switches + 1 trip alarm switch (HQ). That gives three separate signal paths: two for status (open/closed) and one dedicated to trip indication. No undervoltage release and no voltage trigger are included on this order code. Power loss is 10 W maximum at rated current — relevant for thermal budgeting inside a sealed enclosure.
Panel integration notes
Front IP40 protection class means it is protected against tools and wires >1 mm — standard for a panel-mounted breaker with the cover closed. No washdown rating; keep it inside the enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum is the one to watch if the breaker sits in an unheated warehouse before installation. Latching endurance is 20,000 operations.