The 3VA1196-5EF32-0AA0-ZD00 is a 3-pole IEC molded-case circuit breaker on the 3VA1 frame, rated for a breaking capacity Icu of 55 kA at 415 V AC — class M in Siemens' 3VA hierarchy. The thermal-magnetic trip unit is a TM240 ATAM, with overload protection adjustable from 11 A to 16 A (Ir) and short-circuit protection set at 10 to 20 times In (Ii). That means for a 16 A In, the magnetic pickup ranges from 160 A to 320 A — sized for motor-starting inrush or transformer magnetizing current without nuisance tripping, but verify coordination with downstream branch breakers.
The TM240 ATAM trip unit is field-replaceable without removing the breaker from the bus. Terminals accept copper or aluminum conductors up to the frame's rated cross-section; torque values are marked on the breaker face. The nut keeper kit is a mechanical retention feature for the terminal screws — useful in high-vibration environments like DC power OEM skids.