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.
What the ratings mean for your panel
The 36 kA Icu at 415 V places this breaker in breaking capacity class S — it can safely interrupt fault currents up to 36 kA without upstream fusing, which is typical for industrial distribution boards with high available fault current. 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. The unprotected N pole means the neutral is not switched or protected — common in TN or TT systems where the neutral is bonded to ground and does not require overcurrent protection.