What the ratings mean for fit
The 3VA1050-4ED32-0AA0-ZD00 is a Siemens 3VA1 IEC frame 100 circuit breaker with a breaking capacity class S, rated Icu=36kA at 415V. That 36kA interrupting rating at 415V means it can safely clear a bolted fault up to that level without rupturing or cascading upstream — critical for panel SCCR compliance under IEC 60947-2. The 50A fixed thermal-magnetic trip (TM210) provides overload protection at Ir=50A and short-circuit protection at Ii=10 x In, so it trips instantaneously at 500A. The FTFM designation indicates a fixed thermal, fixed magnetic release — no adjustment dials, which simplifies spec and eliminates field tampering.
Deployment context
This 3-pole breaker mounts on a DIN rail in a standard IEC enclosure. The nut keeper kit included is a specific add for DC Power OEM builds in China — it retains the terminal nuts during high-vibration transport or operation, a detail that matters if you are panel-building for traction or solar DC distribution.