What this MCCB is and what it does
The Siemens 3VA2010-5KP42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed in a warm panel. Four poles, line-protection design, with the ETU850 electronic trip unit that supports communication and additional measurement functions. Breaking capacity reaches 187 kA at 240 V AC and 121 kA at 415/440 V, dropping to 3 kA at 690 V; that SCCR headroom covers most industrial service-entrance and feeder applications without cascading upstream.
Panel fit and integration
Dimensions are 86 mm deep, 140 mm wide, 181 mm high — a standard 4-pole MCCB footprint for DIN-rail or screw-mount panel integration. IP40 on the front face; suitable for enclosed distribution boards where the door provides the environmental seal. The ETU850 release is field-configurable, and the communication port allows integration with higher-level monitoring systems.
What the ratings mean for your BOM
The 100 A continuous rating holds flat from 40 °C to 70 °C — no thermal derating curve to calculate, which simplifies panel design in hot environments. The 187 kA interrupting rating at 240 V AC means this breaker can be installed at the main service entrance where available fault current is high, without needing a current-limiting upstream device. At 690 V the 3 kA rating is lower, but that voltage level is uncommon in standard industrial distribution; the 121 kA at 415 V covers the typical European 400 V feeder. The ETU850 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection (though this variant is shipped without ground-fault monitoring — the '0AA0' suffix indicates no ground-fault module).