Siemens 3SK1111-1AB30 — SIRIUS 3SK1 safety relay. Compact safety relay for emergency-stop, safety-gate and light-curtain monitoring per EN ISO 13849. SIRIUS 3SK1 safety relay, basic unit, 24VDC. PL e/Cat 4 per EN ISO 13849-1, SIL 3 per IEC 61508. 3 enabling paths, 1 signaling output. Installed in low-voltage switchgear panels, main and sub-distribution boards, motor control centres and DIN-rail consumer units.