What this 3VA1 breaker is and what it does
The Siemens 3VA1163-5MH32-0AG0 is a 3-pole IEC molded case circuit breaker on a 160 A frame, rated for 63 A continuous current (In) with a TM120M thermal-magnetic trip unit. Its breaking capacity class M delivers Icu=55kA @ 415V AC — enough to interrupt high fault currents typical in industrial distribution panels without upstream coordination failure. The TM120M provides magnetic-only short-circuit protection adjustable from 5 to 15 times In (Ii=5...15 x In), with no built-in overload protection; that function is handled by a separate starter or overload relay downstream. The nut keeper kit, one auxiliary switch (HP), and one trip alarm switch (HP) are factory-fitted accessories, saving panel build time.