What this breaker is and what the ratings mean
The Siemens 3VA1010-2ED42-0AA0-ZD00 is a 3VA1 IEC Frame 100 molded-case circuit breaker (MCCB) rated for system protection duty with a TM210 thermal-magnetic trip unit. The 100 A fixed rating (Ir=100 A non-adjustable) means overload protection is set at the factory — no field dial to turn, so the BOM line is locked once specified. The short-circuit release is fixed at 10 x In (1000 A), which suits distribution and feeder applications where you want a moderate magnetic pickup to ride out motor inrush without nuisance tripping. The 16 kA interrupting capacity at 415 V (switching capacity class B) tells you this breaker can safely clear a fault up to that level on a 415 V three-phase system without welding contacts or venting gas into adjacent gear. Class B means it's rated for full selectivity with an upstream device — useful in a panel where you need the downstream breaker to clear first and keep the rest of the bus live. It's a 4-pole unit with the neutral unprotected (no overcurrent element on the N conductor), which is standard for TN or TT systems where the neutral is bonded to ground and doesn't need its own trip. The lug terminal is sized for DC power applications — the OEM variant is built in China and carries the -ZD00 suffix for that supply chain.
Panel integration notes
The 3VA1 frame mounts on a DIN rail or can be screw-fixed to a backplate. Four poles at 100 A mean the breaker occupies the full frame width — plan for a minimum 25 mm of DIN rail per pole plus the operating mechanism overhang. The lug terminals accept conductors sized for a 100 A feeder; verify your lug crimp tool matches the terminal tunnel dimensions before terminating.