Siemens 3VA2510-5KQ32-0JC0 — 1000 A SENTRON MCCB with ETU860
Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — numbers that govern its fault-clearing capability in a distribution panel. The ETU860 allows adjustable long-time (tr) and short-time (tsd) delay settings, with tr from 0.5 to 25 seconds and tsd from 0.05 to 0.5 seconds, giving selectivity coordination flexibility downstream.
Derating begins at 60 °C (955 A), dropping to 885 A at 65 °C and 815 A at 70 °C. The enclosure footprint is 210 mm wide, 320 mm high, and 120 mm deep — dimensions that determine backpanel layout and whether it fits existing busbar or cable-connection zones.
What the ETU860 release means for coordination
The ETU860 is a microprocessor-based trip unit that supports adjustable long-time pickup (Ir) from 0.4× to 1.0× Iu — here up to 1000 A — plus short-time and instantaneous settings. Ground-fault monitoring is via summation current formation on the line conductor. Maximum power loss is 123 W, a number to factor into enclosure thermal calculations when the breaker is enclosed with other heat sources.