What this breaker is and what it does
The Siemens 3VA1150-5GD42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 series, rated In=50A with a fixed overload protection Ir=50A and fixed short-circuit protection set at Ii=10 x In. Its breaking capacity class M delivers Icu=55kA at 415V, meaning it can safely interrupt fault currents up to that level without upstream damage — sized for high-fault panels where a standard 25kA or 36kA breaker would risk cascading failure.
Deployment context
This breaker includes a nut keeper kit for DC Power OEM applications in China, so it's pre-configured for panel integration where the neutral conductor is protected at 100% and the line protection uses a TM210 thermal-magnetic trip unit with FTFM (fixed thermal, fixed magnetic) settings. The 4-pole format suits three-phase plus neutral distribution in switchboards or motor control centers.