What it is — and what the ratings mean for fit
The Siemens SENTRON 3VA2010-7HM42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, designed for line protection in distribution panels. The 100 A rating holds flat across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing in warm enclosures. Breaking capacity reaches 330 kA at 240 V and 242 kA at 415 V, tapering to 3 kA at 690 V; those numbers tell you this breaker is built for high-fault locations like transformer secondaries or large motor control centers where fault current can exceed 200 kA. The adjustable thermal-magnetic trip range spans 150 A to 1 200 A (the maximum setting), so the 100 A frame can be tuned to protect feeders well above its continuous rating — typical for an MCCB with an electronic trip unit. The 800 V rated insulation voltage (Ui) gives headroom for 690 V systems. Ground-fault monitoring is built in as summation current sensing on L+N conductors, which covers TN and TT systems without an external module.
Panel fit and integration
The breaker measures 86 mm deep × 140 mm wide × 181 mm high. The 140 mm width is standard for a 4-pole MCCB in the SENTRON 3VA platform, so it drops into the same mounting footprint as other 4-pole 3VA frames. No undervoltage release, no communication function, and no trip indicator on this variant — it is a straight line-protection device with ground-fault summation sensing. Power loss at rated current is 7.7 W, which matters for thermal budgeting in a sealed enclosure.