Railway-grade construction and environment
Vibration resistance per IEC 60068-2-6 is ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz — that's the kind of spec a trackside panel sees from passing trains or a locomotive cabinet sees underway. Operating temperature spans -40 °C to 75 °C, with humidity derating: max 95% RH up to 55 °C, tapering to 35% at 75 °C. That covers everything from a frozen January yard to a hot summer engine room.
Supplementary devices can be installed (the product extension is supported), so you can add auxiliary contacts, shunt trips, or alarm switches without changing the base breaker.