Siemens 3TK28 Series Output Module, 0 Inputs, 5 Outputs, 24 V ac/dc, 4NO

The SIRIUS 3TK28 30 Expansion Units are used to increase the number of contacts that can be used on safety related control units. One enabling contact of the base unit is required to connect the expansion unit. The category of a control system with expansion unit corresponds to the category of the basic unit. One basic unit may be connected to several expansion units.

Expansion module for use with 3TK28 2 safety relays
Safety category dependent on base unit

EN 60204-1, EN 292, EN 954-1

Expansion units may not be used separately in safety circuits.