What this breaker is and what it does
The Siemens 3VA1125-4EE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker with a 25 A thermal-magnetic trip (TM220, ATFM) and a breaking capacity of 36 kA at 415 V — class S on the 3VA1 platform. The overload protection is adjustable from 18 A to 25 A, and the instantaneous short-circuit pickup is fixed at 12.8 times the rated current In. The neutral conductor is unprotected (no integral neutral protection), and the breaker ships with a nut keeper kit; this variant is configured for a DC Power OEM in China.