What this breaker carries
The Siemens 3VA2463-6KP42-0BC0 is a 4-pole IEC frame 630 molded case circuit breaker with class H interrupting capacity — 85 kA at 415 V AC. That rating means it clears high-fault currents on the main distribution board without cascading upstream, so you can hold selectivity on a 415 V bus with a transformer-fed switchboard. The ETU850 electronic trip unit gives you LSI protection: long-time (Ir) adjustable 250 A to 630 A, short-time (Isd) 0.6 to 9× In, and instantaneous (Ii) 1.5 to 9× In. Neutral protection is adjustable from OFF up to 100% of the phase setting — useful on a 4-wire system where you need to coordinate the neutral with the phase conductors. It ships with an undervoltage release (UVR) coil at 24 V DC, two HQ auxiliary switches for status feedback, and a nut keeper kit for secure panel mounting. The UVR drops the breaker on loss of control voltage — standard for emergency-stop chains or undervoltage protection schemes.
Lifecycle and sourcing
The 3VA2 platform is Siemens' main IEC MCCB family for commercial and industrial distribution. This order code is specified into the BOM; we source it to order against an RFQ through independent distribution, with availability and current pricing confirmed at quote time.
What the ratings mean for fit
The 85 kA Icu at 415 V puts this in the H (high) breaking capacity class — it handles the fault current available close to a 1 MVA transformer without needing a current-limiting fuse upstream. For a 480 V system, check the derated Icu; the IEC frame 630 is typically rated at 480 V as well, but the exact figure depends on the specific UL or IEC listing. The adjustable LSI curve and neutral protection make this breaker suitable for main or tie applications on a 4-wire, 3-phase distribution panel where you need to protect the neutral conductor against overload from harmonic currents. The UVR at 24 V DC integrates with a safety PLC or emergency-stop relay that drops the main breaker on a trip condition.