The Siemens 3VA1120-3EF32-0AA0-ZD00 is a 3VA1 IEC frame 160, 3-pole molded case circuit breaker (MCCB) with a 20 A rated current (In) and a 25 kA ultimate breaking capacity (Icu) at 415 V AC, classification N. The thermal-magnetic trip unit (TM240) provides adjustable overload protection (Ir) from 14 A to 20 A, letting you fine-tune the continuous current threshold to match the downstream cable or load without swapping the breaker body. The short-circuit magnetic pickup (Ii) is fixed at 8 to 16 times In (160 A to 320 A), which is typical for motor and distribution feeder protection — high enough to avoid nuisance trips on inrush, low enough to clear a bolted fault fast. This variant includes a nut keeper kit and is designated for a DC Power OEM in China, so the hardware package is pre-configured for that assembly line. The breaker itself is standard 3VA1 platform — same frame, same breaking capacity, same trip curve — the ZD00 suffix flags the OEM-specific accessory kit.
Deployment context — where this breaker fits
The 3-pole configuration suits three-phase circuits — feeder protection for a 20 A motor branch, a lighting panel, or a small distribution sub-panel in a 415 V industrial installation. If your system's prospective short-circuit current is higher, you need a higher-rated upstream device or a current-limiting breaker.