What it is and what it does
The Siemens SENTRON 3VA2110-7MS32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed in a warm panel. Its adjustable thermal-magnetic trip covers 300 A to 1 500 A, so you set the pickup to match the load rather than swapping hardware. The interrupting ratings climb to 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V; that kind of SCCR headroom means it can sit upstream of smaller branch breakers without worrying about cascading failure during a fault.
Starter protection design — what that means for the panel
This breaker is explicitly designed for starter protection, meaning it is meant to sit ahead of a motor contactor and overload relay in a motor control center or individual starter bucket. The built-in shunt trip (STL) allows a remote trip signal from a safety relay or PLC — handy for E-stop chains or emergency-off circuits. The auxiliary switch complement — 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ — gives you status feedback for the PLC or HMI without adding external interposing relays. No undervoltage release, no ground-fault monitoring, and no communication module, so keep those functions external if the application requires them.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard MCCB footprint that drops into most SENTRON mounting bases and DIN-rail adapters without panel modifications. The 3-pole block occupies roughly 4 inches of rail width; plan for the shunt trip wiring and auxiliary switch terminals on the left side when laying out the gland plate and wireway fill.