The Siemens 3VA1150-3GE42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker in the 3VA1 series, rated In=50 A with a breaking capacity class N (Icu=25 kA at 415 V). Overload protection (Ir) is adjustable from 35 to 50 A via the TM220 thermal-magnetic trip unit; short-circuit protection (Ii) is fixed at 10 x In. The N conductor is protected at 100%, and the unit includes a nut keeper kit for DC Power OEM applications in China.
What the ratings mean for fit
The Icu=25 kA at 415 V means this breaker can safely interrupt fault currents up to that level without external fusing — sufficient for most commercial and light industrial panelboards with transformer-fed fault levels under that threshold. The 4-pole configuration with full N protection makes it suitable for TN-S or TT systems where the neutral must be switched and protected. The Ir range of 35–50 A allows field adjustment to match the actual load without swapping the trip unit.
The TM220 trip unit has a fixed magnetic pickup at 10 x In. The nut keeper kit is a mechanical accessory for panel-mounting in OEM DC power equipment; verify gland-plate clearance before panel integration.