What this 5SJ6520-6 does in the panel
That's enough for a 20 A feed and downstream tails in the same clamp. The terminal is sealable — important if the panel gets locked and tagged by the utility or an inspector who wants to verify nobody's tampered with the circuit after commissioning.
Mounting and integration — DIN-rail fit
Mounting position is any — vertical, horizontal, upside-down — the arc chamber works the same. Ambient temperature range is -20 to +45 °C, with short-term excursions up to +55 °C and 95% humidity. That covers a ventilated enclosure in a boiler room or a shaded outdoor kiosk, but if it's living next to a hot transformer or direct sun, keep the ambient check in mind.
What the approvals mean for your panel
That dual rating means it meets the household standard (EN 60898) and the industrial standard (IEC 60947-2) — so it's accepted in residential DBs and in industrial control panels that spec the IEC 60947-2 mark. Insulation voltage is 440 V AC, overvoltage category III, which is the typical distribution-board category. Vibration resistance is tested per IEC 60068-2-6 at 50 m/s² over 25 to 150 Hz — it'll hold up on a machine skid or a genset-mounted panel. Mechanical service life is 20 000 switching cycles typical. That's the handle-and-mechanism endurance, not the electrical endurance under load — but it tells you the mechanism is built for years of occasional manual isolation, not daily load switching.