What the ratings mean for fit
The Siemens 3VA1180-5EF42-0AA0-ZD00 is a 4-pole IEC molded-case circuit breaker on a 160 A frame, with a 55 kA interrupting capacity at 415 V (class M). That 55 kA Icu at 415 V means it can safely clear a fault up to that level without welding contacts or cascading upstream — critical for high-fault-capacity panels where a standard 25 kA breaker would need a current-limiting upstream device. The thermal-magnetic trip (TM240, ATAM) gives adjustable overload protection from 56 A to 80 A via the Ir dial, and fixed short-circuit pickup at 5 to 10 times In (400 A to 800 A). The N conductor is unprotected (solid neutral), so this is a 3-pole-plus-neutral configuration — the neutral bar passes through without a trip element, which is standard for line-side distribution where the neutral is bonded to ground. The nut keeper kit and DC Power OEM designation suggest this variant was built for a specific DC-power OEM assembly in China; the nut keeper retains the busbar connection hardware during vibration or transport.
Deployment context
Mounts in a standard IEC panel on a DIN rail or screw-fixed backplate — the 160 A frame size is common for main or feeder breakers in industrial distribution boards. The 4-pole configuration suits three-phase systems with a switched neutral, though the unprotected N means the neutral is a pass-through bus, not a switched pole. The nut keeper kit is a small but important detail for panel builders: it prevents the busbar connection from loosening under thermal cycling or shipping vibration, which is a common failure point in OEM assemblies shipped long distances.