Rated breaking capacity is 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235, so it handles fault currents up to those levels without welding the contacts or cascading upstream.
Operating temperature spans -40 °C to 75 °C, with humidity derating above 55 °C (95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C).
The 5SY6503-7CC is halogen-free and silicon-free, which simplifies compliance with RoHS and REACH declarations for the panel builder. UL 1077 and CSA C22.2 No.235 listing at 5 kA means it is accepted for North American industrial control panels — not just European IEC installations. Vibration resistance per IEC 60068-2-6 (±1 mm at 5 to 25 Hz; 50 m/s² at 25 to 150 Hz) confirms it holds calibration under typical machine vibration.