The Siemens 3VA2440-5MP32-0KD0 is a 3-pole IEC frame 630 molded case circuit breaker (MCCB) rated for motor protection, with a breaking capacity class M achieving Icu=55 kA at 415 V AC. It carries an In=400 A continuous rating and uses the ETU550M electronic trip unit with LSI protection — long-time (overload) adjustable Ir=160…400 A, short-time Isd=1.2…15×In, and instantaneous Ii=3…15×In. The breaker includes a left-mounted shunt trip rated 208-277 V AC 50/60 Hz and 220-250 V DC, plus three auxiliary switch changeover contacts. Busbar connection is standard.
What the ratings mean for fit
The 55 kA Icu at 415 V tells you this breaker can safely interrupt a fault current up to that level without damage — critical for panels with high available short-circuit current. The ETU550M LSI trip unit gives you adjustable overload (Ir), short-time (Isd), and instantaneous (Ii) settings, so you can coordinate with downstream motor starters and upstream feeders. The 400 A frame and adjustable Ir down to 160 A mean it covers a wide motor FLA range, but the minimum Ir of 160 A sets the floor for the motor you protect.
Where it is used
This MCCB is designed for motor branch circuits in industrial control panels — typically feeding a motor starter or soft starter for pumps, fans, conveyors, or compressors. The LSI trip characteristic allows selectivity with downstream overload relays and short-circuit protection devices. The busbar connection suits it for main or sub-feed distribution in switchboards and motor control centers (MCCs).