What it is and what it does
The Siemens SENTRON 3VA2110-7MS32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, fitted with an ETU310M electronic overcurrent release. It is designed for starter protection — meaning it handles the high inrush and overload profile of motor starters — and carries a maximum breaking capacity of 330 kA at 240 V, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The trip unit is electronic, not thermal-magnetic, so it offers adjustable long-time, short-time, and instantaneous pickup settings — useful for coordinating with downstream motor-protective devices.
What the ratings mean for fit
The 100 A rating holds flat from 40 °C through 70 °C ambient — no derating curve to calculate for warm enclosures. The 800 V rated insulation voltage gives margin for 480 V and 600 V class systems. The ETU310M trip unit supports adjustable overload and short-circuit protection, but this variant lacks undervoltage release, shunt trip, ground-fault monitoring, communication, phase-failure detection, and a trip indicator — so if your panel requires any of those, you need a different suffix. Power loss is 10 W maximum, which matters for enclosure thermal budgeting.
Panel fit and dimensions
The breaker measures 86 mm deep, 105 mm wide, and 181 mm high. It mounts on a DIN rail or can be screw-fixed to a backplate. The 3-pole footprint is standard for SENTRON 3VA2 frame size; if you are swapping into a panel originally wired for a 3VA2110-7HK42-0AA0, the physical dimensions are identical — same frame, same pole count — so no re-drilling or re-wiring of the bus bars is needed, provided the trip unit and accessory configuration match your circuit.