Siemens 3TK2824-2BB40 SIRIUS Safety Relay 24VDC

Siemens 3TK2824-2BB40 SIRIUS safety relay is a 24 V DC safety relay with relay enabling circuits (EC), designed to govern safety interlocks and enablement in machine control. The device is 22.5 mm wide and uses spring-type terminals for compact panel installation. It provides two instantaneous enabling contacts (EC instantaneous: 2 NO), with no delayed enabling contacts and no signaling circuit (SC: 0 NC). Classified as a basic safety device, it supports SIL 1 and PL C performance, suitable for circuits that require reliable safe-start conditions. The coil operates at 24 V DC, and the unit is part of the SIRIUS 3TK28 family of safety relays. In Siemens catalogs, this model lists successors such as 3SK1111-2AB30 or 3SK1211-2BB40 for potential migration.