What this 3VA2 MCCB carries
The Siemens 3VA2110-5HN42-0DA0 is a 4-pole IEC frame 160 molded case circuit breaker with a 55 kA breaking capacity at 415 V (class M), rated at In = 100 A. It uses an ETU350 LSI electronic trip unit with adjustable overload protection Ir = 40…100 A, short-circuit protection Isd = 1.5…10 × Ir, and instantaneous protection Ii = 12 × In. The neutral conductor protection is adjustable (OFF, 50%, 100%). The unit ships with a factory-fitted undervoltage release rated 208–230 V AC, 50/60 Hz, and a nut keeper kit for panel mounting.
What the ratings mean for panel fit
The 55 kA Icu at 415 V places this breaker in the medium breaking capacity class (class M), sized for industrial distribution panels where fault currents can reach that level — typical for transformer-fed switchboards in a factory. The ETU350 LSI trip unit provides selective coordination with downstream breakers: the long-time (L) band handles overloads, the short-time (S) band with adjustable delay allows downstream devices to clear a fault first, and the instantaneous (I) band catches high-magnitude faults. The adjustable neutral protection (OFF, 50%, 100%) suits 4-wire systems where neutral current monitoring is required by local code.
Undervoltage release integration
The integrated undervoltage release (208–230 V AC, 50/60 Hz) automatically trips the breaker when control voltage drops below its dropout threshold — a standard requirement for emergency-stop circuits and safety disconnects in machinery. The release is factory-installed, so no field wiring of a separate accessory is needed.