Safety relay for one enabling circuit
The Siemens 3SK1120-2AB40-Z X90 is a SIRIUS Advanced series safety relay with one enabling circuit rated at 0.5 A, powered by 24 V DC. It uses spring-type push-in terminals for wiring — no screwdriver needed on the terminations, which speeds panel assembly and avoids loose-terminal callbacks. The single enabling circuit is a straightforward fit for guarding one hazard zone or one e-stop loop; if your safety circuit needs multiple independent channels, you'd step up to a dual- or triple-circuit variant in the same series. This relay sits in a standard DIN-rail enclosure alongside other SIRIUS control gear. For a commissioning engineer, the spring clamp means no torque spec to verify — just strip, insert, pull-test.