What this breaker is and what the ratings mean
The Siemens 3VA1463-5GE42-0AA0-ZD00 is a 4-pole IEC frame 630 molded-case circuit breaker from the 3VA1 series, configured for line protection with a TM220 thermal-magnetic trip unit. The headline rating is Icu=55kA at 415V AC — that is the maximum short-circuit current the breaker can safely interrupt at that voltage without damage, placing it in breaking capacity class M (medium). For a 630A frame, 55kA at 415V gives solid selectivity headroom downstream; you can coordinate it with smaller branch breakers without worrying about cascading failures on a high-fault panel.
Overload and short-circuit settings
The TM220 trip unit provides adjustable overload protection (Ir) from 440A to 630A, covering the full In=630A rating. Short-circuit pickup (Ii) is fixed at 8 x In, or 5040A. The N conductor is protected at 100% of the phase rating — important for 4-wire systems where the neutral carries harmonic currents. This breaker also includes an ATFM (Advanced Thermal and Fixed Magnetic) characteristic, which means the thermal curve is adjustable but the magnetic instantaneous pickup is factory-set.
Deployment context and panel integration
This is a panel-mount breaker for IEC switchgear, typically installed in a distribution board or motor control center. The 4-pole configuration suits three-phase plus neutral systems common in commercial and industrial buildings. The nut keeper kit (included per the order code suffix) simplifies mounting in DC power OEM assemblies — it retains the mounting nuts during installation, a small time-saver on repetitive builds.