The Siemens 3VA1150-4EE42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at 50 A with a breaking capacity class S (Icu=36 kA at 415 V). It uses a TM220 thermal-magnetic trip unit with adjustable overload protection (Ir = 35 A to 50 A) and fixed short-circuit protection set at Ii = 10 x In. The N conductor is unprotected, and the unit includes a nut keeper kit for DC Power OEM applications in China.
What the Ratings Mean for Fit
The 36 kA breaking capacity at 415 V (class S) means this breaker can safely interrupt fault currents up to that level without upstream cascading — critical for panel selectivity studies. The adjustable overload range (Ir = 35 A to 50 A) lets you fine-tune the trip point to the actual load, while the fixed short-circuit setting at 10 x In (500 A) provides a defined magnetic trip threshold. The unprotected N conductor signals that the neutral is not switched or monitored, which is standard for many 4-pole line-side configurations.
Deployment Context
This breaker mounts on a DIN rail in a standard IEC enclosure, sized for panel integration in OEM equipment or distribution boards. The nut keeper kit is specific to DC Power OEM builds in China, so verify the mounting hardware matches your panel layout.