The Siemens 3VA1110-5EE32-0AA0-ZD00 is a 3-pole IEC molded-case circuit breaker from the 3VA1 frame-160 series, rated for line protection with a TM220 thermal-magnetic trip unit. Its headline breaking capacity is 55 kA at 415 V (class M), which means it can safely interrupt a fault current of that magnitude without upstream cascading — critical for selectivity in a distribution panel where the main breaker must clear a downstream short before the transformer-side protection opens.
Ratings and what they mean for fit
The In rating is 100 A, with overload protection adjustable from 70 A to 100 A via the Ir dial. That adjustability lets you fine-tune the trip point to the actual continuous load without swapping the breaker — useful when the branch circuit serves a motor or a variable load that draws less than the full frame rating. Short-circuit protection is fixed at Ii = 10 x In, so the magnetic trip fires at 1000 A. For a feeder feeding a panel with multiple downstream breakers, that 10x multiplier provides reasonable coordination headroom against instantaneous trips from smaller branch faults.