It mounts stand-alone or directly onto a contactor, with cage clamp terminals accepting 2x (0.5... 2.5 mm²) solid or finely stranded wire. The IP20 front protection keeps fingers out of the live terminals inside the panel.
Where it fits — panel and environment
That zero-clearance top and bottom means you can stack relays without leaving ventilation gaps, though the 6 mm side gap must be respected for heat dissipation. Rated for altitudes up to 2 000 m without derating. Shock resistance is 8g for 10 ms — typical for industrial cabinet mounting on a machine base. That covers most panel orientations without needing a special bracket.
The 3RU1116-1KC1 carries ATEX protection type DMT 98 ATEX G 001, so it is approved for use in potentially explosive gas atmospheres. Relative humidity tolerance is 100% during operation — condensation-proof for humid environments.