Motor protection breaker with ETU860M LSIG trip unit
The Siemens 3VA2440-5MQ32-0AF0 is a 3-pole IEC frame 630 circuit breaker in breaking capacity class M, rated Icu=55kA at 415 V. It carries the ETU860M electronic trip unit with LSIG protection — overload (L), short-time (S), instantaneous (I), and ground-fault (G) — and is configured for motor protection duty. The In rating is 400 A, with overload protection adjustable Ir=160 A to 400 A, short-circuit protection Isd=1.2 to 15 x In, and Ii=3 to 15 x In. Ground-fault protection can be switched off, with Ig adjustable 0.2 to 1 x In and tg=0.05 to 0.8 s. The breaker includes one auxiliary switch changeover H and one trip alarm switch changeover.
What the ratings mean for fit
The 55 kA Icu at 415 V places this breaker in the M (medium) breaking capacity class — sufficient for most industrial motor branch circuits and distribution panels where the prospective short-circuit current at the point of installation does not exceed that level. The ETU860M LSIG trip unit gives you selective coordination capability: the L (long-time) element protects the motor against overload, S (short-time) allows delayed tripping for downstream selectivity, I (instantaneous) clears hard faults, and G (ground-fault) detects leakage to earth. The adjustable ground-fault delay (tg) from 0.05 to 0.8 s lets you coordinate with downstream GFCI devices or upstream feeder breakers. This is a panel-mount breaker sized for the IEC frame 630 footprint — verify the mounting cradle and busbar connection pattern match your existing switchboard or MCC bucket.