What this 3VA1 breaker carries
The Siemens 3VA1220-4EF32-0KB0 is a 3-pole IEC frame 250 molded case circuit breaker in breaking capacity class S, rated for a 36 kA interrupting capacity at 415 V AC. It ships with a TM240 thermal-magnetic trip unit set for a 200 A nominal rating (In), with overload protection adjustable from 140 A to 200 A (Ir) and short-circuit protection adjustable from 5 to 10 times In (Ii). The unit includes a factory-installed shunt trip on the left side, rated 208–277 V AC 50/60 Hz and 220–250 V DC, plus two auxiliary switch changeover contacts.
What the ratings mean for panel fit
The 36 kA breaking capacity at 415 V (class S) means this breaker can safely interrupt fault currents up to that level without upstream cascading — critical for selective coordination in a distribution panel. The TM240 thermal-magnetic trip provides line protection for cable and bus, with the adjustable Ir band (140–200 A) letting you fine-tune overload pickup to match the downstream load without swapping the trip unit. The shunt trip on the left side accepts either AC or DC control voltage, so it can be wired into a remote emergency-stop or undervoltage-release circuit without a separate rectifier. Two auxiliary switch changeover contacts give status feedback to a PLC or indication lamp.