What this 3VA2 MCCB carries
The Siemens 3VA2340-5HN32-0KK0 is a 3-pole IEC frame 400 molded case circuit breaker in the 3VA2 series, rated for line protection with an ETU350 LSI electronic trip unit. Its interrupting capacity is 55 kA Icu at 415 V AC, placing it in breaking capacity class M — sufficient for most industrial distribution panels where fault currents stay under that threshold. The continuous current rating In is 400 A, with overload protection (Ir) adjustable from 160 A to 400 A and short-circuit protection (Isd) from 1.5 to 10 times Ir. Instantaneous pickup (Ii) is fixed at 10 times In. The unit ships with a shunt trip accessory wired on the left side, rated 208–277 V AC 50/60 Hz and 220–250 V DC, plus one auxiliary contact. The nut keeper kit is included for secure mounting in the panel.
Lifecycle and sourcing posture
For current pricing and availability, submit an RFQ against this order code. The unit is sourced through independent distribution channels; availability and firm pricing are confirmed at quote time.
What the ratings mean for panel integration
The 55 kA Icu at 415 V AC defines the maximum fault current the breaker can safely interrupt without damage — critical for verifying SCCR compliance in the upstream switchboard. The ETU350 LSI trip unit allows field-adjustable long-time, short-time, and instantaneous pickup settings, giving the commissioning engineer selectivity coordination flexibility downstream of a larger feeder breaker. The shunt trip accessory on the left side accepts either AC (208–277 V) or DC (220–250 V) control voltage, so it can be wired into an emergency-stop circuit or remote-trip system without an intermediate relay. The auxiliary contact provides a status signal for the PLC or SCADA input.