What this 4-pole MCCB carries — and what it doesn't
The Siemens 3VA2010-8HM42-0AA0 is a SENTRON 3VA2 molded case circuit breaker with four poles, rated for line protection. It carries 100 A continuously across the full operating temperature range from -25 °C to 70 °C, with no derating needed at 70 °C — that's a flat 100 A curve. The ETU330 electronic trip unit handles the overcurrent release, configurable for N-conductor protection at OFF, 50%, or 100%. Breaking capacity hits 440 kA at 240 V and 330 kA at 415 V, so this breaker is sized for high-fault installations where an upstream transformer or bus can deliver serious energy.
Panel fit and integration
Dimensions are 181 mm high by 140 mm wide by 86 mm deep. The IP40 rating on the front means it's protected against solid objects larger than 1 mm — suitable for enclosed panel mounting where no washdown or outdoor exposure occurs. Ground-fault monitoring uses summation current formation of L + N conductors. No undervoltage release, no voltage trigger, and no communication function are built in; this is a straight line-protection breaker with the ETU330 doing the intelligent tripping.
What the ratings mean for selectivity and coordination
The 440 kA at 240 V and 330 kA at 415 V are the ultimate breaking capacities (Icu) — the maximum fault current the breaker can safely interrupt once. For selectivity studies, the ETU330's electronic trip curve gives a wider adjustment range than a thermal-magnetic unit, making downstream coordination easier. The 800 V rated insulation voltage (Ui) confirms this breaker is designed for 690 V systems with margin. Power loss is 7.7 W maximum at rated current — factor that into enclosure thermal calculations if the panel is densely packed.