The SENTRON 3VA1120-6EF32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated 20 A at 40 °C, built for line protection duty. It carries a 220 kA interrupting rating at 240 V — that's the figure that governs fault clearing on a 240 V secondary side; at 415 V it still holds 154 kA, and at 690 V it drops to 17 kA, so the SCCR headroom depends on your system voltage. The 800 V rated insulation voltage means it's comfortable in 480 V or 600 V class panels as long as the fault current stays within the curve.
Panel footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — standard 3-pole MCCB spacing on a DIN rail or direct-mount plate. The 12 W max power loss is low enough that derating for adjacent units in a sealed enclosure is minimal, but if you're packing six of these in a row at 70 °C ambient, the 19 A derate kicks in.
Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. No trip indicator, so fault diagnostics rely on the auxiliary switch state or a separate indication module. The voltage trigger refers to the shunt trip coil — apply rated voltage and it opens the breaker remotely, useful for emergency-stop circuits or remote load shedding.