What the ratings mean for fit
The Siemens SENTRON 3VA2116-6KQ32-0AA0 is a 3-pole molded case circuit breaker rated for a continuous current Iu of 160 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The ETU860 electronic trip unit provides adjustable overload and short-circuit protection, plus ground-fault monitoring via summation current formation on the L-conductor. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. That 242 kA figure at 240 V means this breaker can safely interrupt a fault current of that magnitude without welding contacts or cascading upstream — critical for high-fault installations like large transformer secondaries or industrial switchboards where available fault current exceeds typical MCCB ratings.
Panel integration and deployment
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without rework. IP40 on the front means it is protected against tools and small wires entering the breaker face, but the enclosure itself must provide the overall panel IP rating. The optional motor drive allows remote electrical closing, useful for automated transfer schemes or remote-reset applications. Communication function is built in, supporting integration with higher-level monitoring systems.
Ground-fault and release detail
The ETU860 release is an electronic trip unit with LSI protection curves (long-time, short-time, instantaneous) plus ground-fault protection. The ground-fault monitoring uses summation current formation on the L-conductor — meaning it measures the vector sum of phase currents to detect leakage to earth. This is a true residual-current detection method, not a zero-sequence sensor, so it catches arcing ground faults that a simple overcurrent device would miss. Insulation voltage Ui is rated 800 V, so the breaker is suitable for 690 V systems with margin. Maximum power loss is 25.5 W — factor that into enclosure thermal calculations if the panel is tightly packed.