The Siemens 3VA1225-6EF42-0BC0 is a SENTRON 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a 220 kA interrupting capacity at 240 V. It's designed for line protection, so its trip curve and construction are tuned to protect feeders and main buses, not individual motor loads. It comes with an undervoltage release (UVR) built in, which drops the breaker if supply voltage falls below a threshold — a standard requirement for safety circuits on conveyors and presses so the equipment can't auto-restart after a brownout. Two HQ auxiliary switches are integrated.
Sizing and thermal performance
At 55 °C it's still good for 243 A, at 60 °C it's 237 A, and at 65 °C it's 230 A. At the maximum operating temperature of 70 °C it's rated for 223 A. That's a shallow derating curve; you don't lose much headroom even in a hot panel next to drives or transformers.
Interrupting ratings across voltages
The interrupting capacity scales with system voltage: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. At 480 V the figure sits between the 440 V and 500 V numbers, so you're looking at roughly 50 kA class — solid for most 480 V distribution panels.