Motor protection breaker with ETU350M LSI trip
The Siemens 3VA2563-5MN32-0JL0 is a 3-pole IEC frame 1000 circuit breaker in the 3VA2 series, rated 630 A with a breaking capacity class M achieving Icu=55 kA at 415 V. It is configured for motor protection using the ETU350M electronic trip unit with LSI protection — long-time (Ir), short-time (Isd), and instantaneous (Ii) — giving the commissioning engineer adjustable overload and short-circuit coordination for a 250 A to 630 A motor circuit.
Trip unit settings and auxiliary wiring
Overload protection Ir is adjustable from 250 A to 630 A; short-circuit protection Isd is set 3 to 15 times Ir, and instantaneous Ii is fixed at 15 times In (630 A).