What this 3VA1 MCCB carries
This Siemens 3VA1120-5EF32-0AA0-ZD00 is a 3-pole IEC molded-case circuit breaker on the 3VA1 frame (160 A frame size). It is rated for line protection with a TM240 thermal-magnetic trip unit, set for a 20 A nominal current (In) with overload protection adjustable from 14 A to 20 A (Ir). Short-circuit protection (Ii) is fixed at 8 to 16 times In. The breaking capacity class M delivers an Icu of 55 kA at 415 V AC — that is the maximum fault current it can safely interrupt without damage, which is the figure that governs panel SCCR coordination.
Where it fits in the panel
The 3VA1 frame mounts on a DIN rail or can be screw-mounted on a backplate in a standard distribution or motor-control center enclosure. The nut keeper kit keeps the terminal hardware captive during wiring — a small detail that saves time on repetitive builds. Rated for IEC 60947-2 compliance, it is suited for main or branch-circuit protection in industrial switchgear where the 55 kA interrupting rating at 415 V provides headroom for high-fault installations.