The Siemens 3VA1050-2ED42-0AA0-ZD00 is a 4-pole circuit breaker in the 3VA1 IEC frame 100 series, rated at 50 A with a breaking capacity of 16 kA at 415 V (class B). It uses a TM210 thermal-magnetic trip unit with fixed overload protection (Ir = 50 A) and fixed short-circuit protection set to 10 x In. The N conductor is unprotected, and the unit includes a nut keeper kit — a variant built for DC Power OEM supply in China.
What the ratings mean for fit
The 16 kA Icu at 415 V tells you this breaker can safely interrupt a fault current up to that level without failing — critical for coordinating with upstream protective devices in a panel. The fixed Ir at 50 A means the overload pickup is non-adjustable; if your load draws more than 50 A continuously, the TM210 element will trip. The Ii = 10 x In (500 A instantaneous) handles motor starting inrush or transformer magnetizing currents without nuisance tripping, but it's not suitable for loads with very high inrush that exceed that multiple. The unprotected N conductor means the neutral pole has no overcurrent protection — it's a switched neutral only, common in 3-phase 4-wire distribution where the neutral is bonded at the source.