For a 480 V wye service (277/480 V) the relevant figure is the 121 kA at 440 V, which gives substantial SCCR headroom for most industrial and data-center switchboards. At 690 V it still clears 9 kA, enough for some European 690 V distribution. This is a line-protection design — meaning it trips on overload and short-circuit to protect the cable, not a motor or generator directly. The adjustable thermal-magnetic or electronic trip unit (the basic switch is 3VA2463-5JP32-0AA0) lets you set the long-time pickup between 945 A minimum and 5 670 A maximum, covering a wide range of feeder sizes.
Panel Fit and Communication
The 138 mm width per 3-pole unit is the critical dimension for multi-breaker lineup spacing. The breaker includes a communication function for remote trip indication, current metering, and parameter adjustment. No undervoltage release is fitted as standard.
Production Status and Compliance
Maximum power loss is 162 W at rated current — factor that into your panel cooling calculation, especially if the breaker is enclosed in a low-ventilation switchboard with other heat sources.