Integrator's note — 3VM1332-5EE42-0AA0
The Siemens 3VM1332-5EE42-0AA0 is a 4-pole IEC frame 400 molded-case circuit breaker rated for 320 A continuous current with a TM220 thermal-magnetic trip unit. The 55 kA breaking capacity at 415 V AC (Icu) means it can safely interrupt a fault up to that level without upstream fuses or a larger-frame breaker — useful for high-fault-capacity panelboards or main distribution in industrial plants.
Protection settings and selectivity
Overload protection (Ir) is adjustable from 224 A to 320 A via the ATFM dial, giving you a 30% band to match cable or transformer ratings. Short-circuit protection (Ii) is fixed at 10 x In (3200 A), which is a standard motor-start or distribution setting — it rides through inrush without nuisance tripping while still clearing hard faults. The N conductor is unprotected; this is typical for balanced 3-phase loads where the neutral carries only imbalance current.
Panel integration
Mounts in a standard switchboard or enclosure on a mounting plate — no DIN rail for this frame size. The nut keeper kit (included per) secures the line and load lugs; torque to the manufacturer's spec during commissioning. Packaging dimensions 261 x 208 x 170 mm give you the rough envelope for cutout planning.