What this MCCB carries and where it fits
The Siemens SENTRON 3VA2110-5JQ32-0JA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current (Iu) with an ETU560 electronic trip unit. Its interrupting capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V — so the 240 V figure is the headline, but the 415 V and 440 V numbers are what matter for most industrial 400 V-class distribution panels. Rated insulation voltage is 800 V, which covers standard 480/277 V and 600 V systems with headroom. It ships with a shunt trip release (STL) and a communication function, meaning it can be tripped remotely and integrated into a higher-level monitoring or control scheme — useful for emergency-off circuits or power-management systems that need to shed loads without a manual panel visit.
Thermal derating — the real continuous current
The 100 A rating holds 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 this breaker sits in a hot enclosure — near other heat sources, in a non-ventilated panel, or in a warm plant environment — the 55 °C and 60 °C figures are the ones to plan around, not the 100 A nameplate. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Footprint and panel fit
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA frame size for a 100 A, 3-pole MCCB. It mounts on a DIN rail or can be screw-fixed to a backplate. The 86 mm depth means it clears most 200 mm-deep enclosures with room for wiring gutters. No auxiliary contacts are included as shipped (without auxiliary contact version), so if you need status feedback to a PLC or indication lamp, plan for a separate auxiliary switch block.