The Siemens 3VA1110-3GE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker rated 100 A, with a breaking capacity of 25 kA at 415 V (class N). It carries the TM220 thermal-magnetic trip unit (ATFM) with adjustable overload protection from 70 A to 100 A and fixed short-circuit protection at 10 × In. The 100% N-conductor protection means the neutral pole is fully rated — no derating needed for unbalanced loads or harmonics, which matters for panel builders feeding mixed single-phase and three-phase gear off the same bus.
The adjustable Ir (70–100 A) lets you match the breaker to the actual load current — useful when the design load is below the fixed In. The fixed Ii = 10 × In means magnetic trip kicks in at 1000 A, so it coordinates well downstream of a larger feeder breaker with a higher short-time pickup.
Deployment Context
This is a panel-mount MCCB for IEC distribution boards. The 4-pole format is standard for three-phase plus neutral in TN-S or TN-C-S systems. The nut keeper kit for DC Power OEM suggests it was originally specified into a DC-side application — verify polarity and arc extinction if repurposing for DC, as the magnetic trip and arc chambers are calibrated for AC waveforms by default.