It is a line-protection device — meaning it protects cables and busbars from overload and short-circuit, not a motor-protection breaker with adjustable trip curves. At 415 V it still breaks 75.6 kA, and at 690 V it holds 11.9 kA — so it stays selective across common industrial voltage levels.
Above that it derates: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. That is the number to use for conductor sizing and load planning, not the 20 A nameplate.
Auxiliary and trip options
The shunt trip is field-wired to a control voltage — common for emergency-stop or PLC-driven shutdown circuits. The integrated auxiliary trip order code is 3VA9688-0BL33, which is the factory-fit accessory that comes pre-installed.
Dimensions are 76.2 mm wide, 130 mm tall, 70 mm deep — that is a standard 3-pole MCCB footprint for the SENTRON 3VA platform. The 15,000-cycle mechanical endurance is typical for this class — enough for a distribution feeder that operates a few times a year, not a daily-switched load.