What this MCCB carries — and what that means for the panel
The Siemens 3VA2110-5HL36-0CL0 is a SENTRON molded case circuit breaker rated for 100 A continuous current (Iu) with an ETU320 electronic trip unit. The interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V — figures that cover most industrial service-entrance and feeder applications without needing a current-limiting upstream device. Three-pole, line-protection version, no voltage trigger, no ground-fault monitoring, no communication function. The footprint measures 105 mm wide by 181 mm high by 86 mm deep, so it fits standard SENTRON panel cutouts and busbar spacing. The ETU320 release is a thermal-magnetic electronic design — it provides adjustable overload and short-circuit protection curves without the mechanical drift of a purely thermal bimetal. That matters when the breaker protects a constant-load feeder (pump, compressor, lighting panel) where nuisance tripping costs production time.
Derating and ambient — the real operating envelope
Rated continuous current holds at 100 A from 40 °C up to 50 °C ambient. At 55 °C it derates to 96.25 A, at 60 °C to 92.5 A, at 65 °C to 88.75 A, and at 70 °C to 85 A. If the panel internal temperature runs above 50 °C — common in sealed enclosures with solar load or multiple heat sources — size the load or the breaker accordingly. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 12.5 W, which contributes to the enclosure thermal budget.
Auxiliary and undervoltage releases — what is inside the can
This order code ships with an integrated undervoltage release (UVR) that trips the breaker when control voltage drops below the dropout threshold — standard for motor control centers where loss of control power must open the feeder. The auxiliary contact block provides 2 auxiliary switches (form C), 1 trip alarm switch, and 1 electrical alarm switch (HQ type). The integrated auxiliary trip is a separate orderable subassembly, 3VA9608-0BB24, which can be replaced independently if the release coil fails. Latching endurance is rated at 20,000 operations.