Siemens 3TK2842-1BB41 is a SIRIUS safety relay with electronic enabling circuits (EC) designed for EMERGENCY STOP devices and protective doors. It operates from a 24 V DC supply and comes in a compact, 22.5 mm wide housing with screw-terminal connections; EC instantaneous: 1 HL and EC delayed: 1 HL, 0.05…3 s. The module supports autostart/monitored start and is rated up to SIL 3 with PL e for functional safety. Although listed as a standard device, Siemens notes it is no longer available and identifies 3SK1122-1CB41 as the preferred successor for continued safety-relay function.
