The Siemens 3VA1110-4EE42-0AA0-ZD00 is a 4-pole circuit breaker from the 3VA1 IEC frame 160 series, rated at 100 A with a breaking capacity of 36 kA at 415 V (breaking capacity class S). It uses a TM220 thermal-magnetic trip unit (ATFM) with adjustable overload protection Ir from 70 A to 100 A and fixed short-circuit protection Ii set at 10 x In. The neutral pole is unprotected, and the unit includes a nut keeper kit — a configuration originally specified for DC Power OEM applications in China.
The adjustable Ir (70–100 A) lets you fine-tune overload protection to match the actual load, while the fixed Ii at 10 x In (1000 A) provides a firm magnetic trip threshold for short-circuit events.
