85 kA at 415 V — what that means for your distribution board
The 3VA2463-6HL32-0BF0 is a Siemens 3VA2 IEC frame 630 circuit breaker with breaking capacity class H, rated Icu = 85 kA at 415 V AC. At 85 kA SCCR, this breaker coordinates with upstream switchgear without requiring a current-limiting fuse or reactor, keeping the fault loop impedance low for downstream devices.
ETU320 LI trip unit — adjustable protection, not fixed
The ETU320 electronic trip unit provides LI (long-time and instantaneous) protection. Overload protection Ir is adjustable from 250 A to 630 A, matching the breaker's In of 630 A — so one frame covers a 250 A feeder or a 630 A main by dialing the pickup. Short-circuit protection Ii is adjustable from 1.5x to 9x In (945 A to 5670 A at the 630 A setting), letting you set instantaneous pickup above motor inrush or transformer magnetizing current without nuisance tripping. The LI curve suits line protection for cables, busbars, and transformers where ground-fault (G) protection is handled separately or downstream.
Integrated undervoltage release and auxiliary contacts
Also includes one HQ auxiliary switch and one HQ trip alarm switch. The HQ designation indicates a high-rupturing-capacity microswitch rated for control-circuit isolation, not just signaling. Both switches give the PLC or SCADA positive indication of breaker position and trip status without relying on the UVR coil state.
What the nut keeper kit saves you
On a panel build with multiple 3VA2 breakers, that adds up to measurable labor savings per unit.